Enabling DHCP snooping

Hello,
We have a 2960 48 port switch in a remote office with a couple of VLANs (VOIP & Data).  The L3 routing is provided via the WAN router and acts as a 'router on a stick' and provides DHCP for both VLANs.
I need to enable DHCP snooping and I have issued the 'ip dhcp snooping trust' on the router port but not for the access ports.  I have then added 'ip dhcp snooping' to the switch but not 'ip dhcp snooping vlan x , x' as I was hoping the ip dhcp snooping bindings database would start to fill up after a few days but it hasn't.
If I add 'ip dhcp snooping vlan x , x' I think the users will get issues as there is no database, what should I do as the router is doing the DHCP.
Thanks

You need to identify the vlans where snooping should be implemented using:
ip dhcp snooping vlan #
The default allows dhcp requests on untrusted ports.

Similar Messages

  • LAN was down ie Users are not getting ip from DHCP server after enabling DHCP snooping

    Hi All ,
    Enclosed file has network connectivity diagram.
    1. L3 vlan's ie 2,3,4,5 and 6 are configured on ACC-CR1 and ACC-CR2. 
    2.Trunk is configured between Core switches ( CR1 and CR2) and access switches .VTP mode is transparent on all switches.L2 vlans are configured on all access switches.
    3.DHCP is server is located at different location and is reachable over MPLS.
    Without enabling dhcp snooping , users connected to access switches (Sw1,sw2,sw3 and Sw4 ) are getting ip address from DHCP server without any problem and everything is working fine.
    But users connected to Sw3 and Sw4 are getting ip address from rouge DHCP server which is not pingable from any one of the switch.
    So we have configured DHCP snooping for all vlan's on CR1 , CR2 , SW3 and SW4 and "trusted uplink ports" which are connected to WAN routers from CR1 and CR2  and also "trusted uplink ports " of Sw3 and Sw4 which are connected to CR1 and CR2.
    As soon we have enabled DHCP snooping and trusted respective uplink ports , users are not getting ip address from remote DHCP server and even users connected to Sw1 and SW2 are facing same issue.
    Note : DHCP snooping is not configured on SW1 and SW2.
    Why users are not getting ip address from remote DHCP server as soon as we enabled dhcp snooping on Core switches and two access switches ie sw3 and sw4 ? what could have caused DHCP packets to be dropped ? Any idea would be appreciated .

    Hi,
    as you say: " HSRP is configured between CR1 and CR2 and Vlans are active on CR1" does it mean there are L3 intrefaces configured in each VLAN on your CR switches and ip hepler-address pointing to the remote DHCP server is configured on each of them?
    I know it's difficult in a productive environment but IMHO you need to find out where are the DHCP offers dropped.
    Either by enabling DHCP debugging or by capturing packets via Wireshark, e.g.
    Best regards,
    Milan

  • FS300-24s, Enable IP DHCP Snooping

    Hi everyone,
    I have 5 sites with FS300-24 and i have a big problem with DHCP.
    On the catalist switches is easy to enable DHCP snooping and Configure “trusted” DHCP ports.
    Is there a way to configure this on fs300-24?
    Any help would be appreciated.
    Albert

    Hello
    1) requires to active ip dhcp snooping the ip dhscp snooping vlan xx - Completed
    2) if applied to one switch with uplinks switches, then the uplink switch will require snooping enabled also and its trunk links trusted  ONLY if the dhcp server is originating from the uplink switch.- Completed 
    3) if dhcp server is attached to the same switch as the snooping database then just trust
     the interface where the server is situated - Completed
    FYI - As long as interfaces are trusted the snooping database does nothing else.
    It listens on the the untrsuted ports and snoops the ip & macs.
    Snooping database WILL NOT be populated with exisitng clients,
    it will populate next time dhcp renews
    res
    Paul

  • Can I use DHCP snooping and IOS DHCP server on the same switch stack

    Hello,
    I am shortly going to be deploying a Cisco CallManager solution for a customer whose network comprises stacks of Catalyst 3850 switches.
    There is no separate core/server farm switch so the CallManager servers, voice gateways and IP phones will all plug into the same stack and be in the same VLAN (not my choice!).
    For security we want to enable DHCP snooping and were planning on using the IOS DHCP server on the Catalyst switch stack.
    Will this work? - when I enable DHCP snooping in networks with separate access layer switches I set the uplinks to the core as trusted links.
    I am not sure whether DHCP snooping will work in this case. Do I need to set the VLAN interface on the switch as trusted, is this even possible?
    Unfortunately I do not have access to a layer 3 switch to test this at the moment.
    Thanks

    Nope.  That's the issue.
    They'll sync on a third device acting as a hotspot, but the device sending a signal is not "on" the network it creates so the airport is all by itself on that network.  At least that is what it looks like to me.  Anyone have another take on it?  Seems pretty silly that an iPad can put out a wifi signal, an Airport Express can receive a wifi signal, and yet there is no simple way to get them to communicate under this particular condition.

  • Catalyst 3750E's and DHCP Snooping

    I am using on our perimeter Catalyst 3750E's and 4500 series switches and I have DHCP Snooping enabled.  Each switch has redundant Layer 3 10Gb uplinks back to our Core/Distribution switches.  We have a central DHCP server and each switch writes its snooping database back to a central TFTP server.
    This was working fine until we upgraded our Active Directory domain to a 2008 domain, with our DHCP server now residing on a Windows 2008R2 server.
    Since the upgrade all 12 stacks of 3750E's will no longer write of the dhcp snooping database.
    show ip dhcp snooping database
    Agent URL : tftp://<path>
    Write delay Timer : 3600 seconds
    Abort Timer : 300 seconds
    Agent Running : No
    Delay Timer Expiry : 17 (00:00:17)
    Abort Timer Expiry : Not Running
    Last Succeded Time : None
    Last Failed Time : None
    Last Failed Reason : No failure recorded.
    Total Attempts       :        0   Startup Failures :        0
    Successful Transfers :        0   Failed Transfers :        0
    Successful Reads     :        0   Failed Reads     :        0
    Successful Writes    :        0   Failed Writes    :        0
    Media Failures       :        0
    All of the 4500's (5 of them) however still work as they did prior to the upgrade.
    show ip dhcp snooping database
    Agent URL : tftp://<path>
    Write delay Timer : 3600 seconds
    Abort Timer : 60 seconds
    Agent Running : No
    Delay Timer Expiry : 2737 (00:45:37)
    Abort Timer Expiry : Not Running
    Last Succeded Time : 07:18:07 EDT Wed Jun 15 2011
    Last Failed Time : None
    Last Failed Reason : No failure recorded.
    Total Attempts       :       13   Startup Failures :        0
    Successful Transfers :       13   Failed Transfers :        0
    Successful Reads     :        0   Failed Reads     :        0
    Successful Writes    :       13   Failed Writes    :        0
    Media Failures       :        0
    Is this a software bug and has anybody else seen this after upgrading to a Windows 2008 AD domain?

    well i found this 
    When DHCP snooping is disabled and DAI is enabled, the switch shuts down all the hosts because all 
    ARP entries in the ARP table will be checked against a nonexistent DHCP database. When DHCP 
    snooping is disabled or in non-DHCP environments, use ARP ACLs to permit or to deny ARP packets
    We dont do arp acl 
    Here is a little infor on the setup on 6500 
    Switch DHCP snooping is enabled
    DHCP snooping is configured on following VLANs: Q,W,E,RT,TY,Y
    Insertion of option 82 is enabled
    Option 82 on untrusted port is not allowed
    Verification of hwaddr field is enabled
    Verification of giaddr field is enabled
    Interface                    Trusted     Rate limit (pps)
    GigabitEthernetX/X          yes         unlimited
    Port-channel                     yes         unlimited
    port config port-channel 
    ip arp inspection trust
     ip dhcp snooping trust
    2960 config 
    Switch DHCP snooping is enabled
    DHCP snooping is configured on following VLANs:Q
    Insertion of option 82 is disabled
       circuit-id default format: vlan-mod-port
       remote-id: 1111:1111:1111 (MAC)
    Option 82 on untrusted port is not allowed
    Verification of hwaddr field is enabled
    Verification of giaddr field is enabled
    DHCP snooping trust/rate is configured on the following Interfaces:
    Interface                  Trusted    Allow option    Rate limit (pps)
    Port-channel              yes        yes             unlimited
    port config 
    interface Port-channel
    ip arp inspection trust
    ip dhcp snooping trust

  • C2950 IOS for DHCP Snooping and DAI

    hi all,
    anyone knows what image i would need for my 2950 to enable DHCP snooping and DAI features (just for lab purpose)?
    or are these features just available on the bigger modular switches (4500 and 6500)?
    >sh ver
    Cisco Internetwork Operating System Software
    IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA8a, RELEASE SOFTWARE (fc1)
    Copyright (c) 1986-2006 by cisco Systems, Inc.
    Compiled Fri 28-Jul-06 15:16 by weiliu
    Image text-base: 0x80010000, data-base: 0x8056A000
    Switch(config)#ip dhcp snooping ?
      information  DHCP Snooping information
      vlan         DHCP Snooping vlan
      <cr>
    Switch(config)#ip arp ?
    % Unrecognized command

    Hi Alain,
    Thanks for this info! I've read you're CCNA Security.
    Just curious, are you gonna write your CCNP Security soon?
    Could you recommend a good lab switch for SECURE?
    Sent from Cisco Technical Support iPad App

  • Ip dhcp snooping on vlan

    hi
    i have following configuration in my switch
    ALS1(config)# ip dhcp snooping
    ALS1(config)# interface range fastethernet 0/7 - 12
    ALS1(config-if-range)# ip dhcp snooping trust
    ALS1(config-if-range)# exit
    ALS1(config)# interface range fastethernet 0/15 - 24
    ALS1(config-if-range)# ip dhcp snooping limit rate 20
    ALS1(config-if-range)# exit
    ALS1(config)# ip dhcp snooping vlan 100,200
    my question is why do we have to configure dhcp snooping on vlan if we already configured on port??
    Thanks
    vish

    I think it just gives you more flexibility ie. you may want to enable DHCP snooping but only for some vlans.
    If you are asking why you need to enable it globally and then per vlan when you could just enable it per vlan I agree with what you are saying.
    There are a number of other commands etc. that follow this line ie. enable it globally and then per vlan or per interface etc.
    I suspect it may be to do with enabling it globally sets up certain things needed on a system wide and not a per vlan or per interface basis but I have wondered that myself sometimes :-)
    Jon

  • SGE2010P DHCP Snooping Bug

    In some cases with DHCP snooping enabled, the switch can cause a DHCP request to be blocked.
    This is appears to be a corner case but it has happened to me with two different pieces of hardware in two different scenarios.
    First, I have a printer on a VLAN where other computers can get an IP address fine but when DHCP snooping is enabled, the printer is unable to obtain an IP.
    Second, I created a separate VLAN for an isolated network and enabled DHCP snooping on that VLAN. A modem was hooked up to one port and added as a trusted interface. A computer was hooked up to another port and with DHCP snooping enabled, the computer was unable to obtain an IP address.
    In both cases, the DHCP snooping binding table shows an IP of 0.0.0.0 for the port with a very low renew time (~100sec). Also, as soon as I disabled DHCP snooping for either of the above VLANs, the devices are able to obtain IP address. It appears that the DHCP OFFER is never making its way back to the device with DHCP snooping enabled.

    Nah,
    I think it has something to do with MAC addresses that don't start with 00.
    Just a hunch though.
    I know they will never fix it and I have moved on.
    I guess it's the "quality" you should expect for Cisco Small Biz.

  • ISE and dhcp snooping

    Hi all,
    The ISE configuration validator says we should have DHCP snooping enabled on our network access devices (switches) so we do it. However I have never understood what this accomplishes. (In terms of ISE/NAC. I understand what DHCP snooping is).
    Can anyone explain? Thanks.

    Thanks for the reply, Vattulu.
    Interesting article/section, but I don't see where it says anything about the relationship between dhcp snooping and profiling. It seems to be talking about the use of dhcp snooping option 82 to convey the 802.1x user info to the dhcp server. The dhcp server can then act on this information to assign specific IPs to specific users. I can see how ISE would get this information via ip-helper or maybe by snmp bulk query, but don't understand how that would assist with profiling. I mean, ISE already has the 802.1x user identity from the radius request, right? Maybe you can enlighten me.
    Googling around I found this article/section:
    http://www.cisco.com/c/en/us/td/docs/security/ise/1-1-1/user_guide/ise_user_guide/ise_sw_cnfg.html#wp1059679
    which seems to imply that dhcp snooping info can be used when applying DACLs. Interesting, because I thought that was based on the ip device tracking table only. But, it says that dhcp snooping is optional, and doesn't go into any detail.
    Still digging, I would like to understand this. Thanks for your help.

  • DHCP Snooping WLC

    Hi,
    I would like to DHCP snooping on the WLC.
    Or a method to block DHCP pirate and authorized my DHCP.
    Best Regards,
    Julien Hernandez.

    Here the client 192.168.0.0 :
    (Cisco Controller) >show client detail 1c:99:4c:6f:c6:96
    Client MAC Address............................... 1c:99:4c:6f:c6:96
    Client Username ................................. N/A
    AP MAC Address................................... 44:ad:d9:57:fd:20
    AP Name.......................................... AP-INDE-106
    AP radio slot Id................................. 0
    Client State..................................... Associated
    Client NAC OOB State............................. Access
    Wireless LAN Id.................................. 1
    Hotspot (802.11u)................................ Not Supported
    BSSID............................................ 44:ad:d9:57:fd:20
    Connected For ................................... 8127 secs
    Channel.......................................... 11
    IP Address....................................... 192.168.0.155
    Gateway Address.................................. Unknown
    Netmask.......................................... Unknown
    Association Id................................... 8
    Authentication Algorithm......................... Open System
    Reason Code...................................... 1
    Status Code...................................... 0
    Session Timeout.................................. 15000
    Client CCX version............................... No CCX support
    QoS Level........................................ Silver
    Avg data Rate.................................... 0
    Burst data Rate.................................. 0
    Avg Real time data Rate.......................... 0
    Burst Real Time data Rate........................ 0
    802.1P Priority Tag.............................. disabled
    CTS Security Group Tag........................... Not Applicable
    KTS CAC Capability............................... No
    WMM Support...................................... Enabled
      APSD ACs.......................................  BK  BE  VI  VO
    Power Save....................................... ON
    Current Rate..................................... m7
    Supported Rates.................................. 5.5,11.0,6.0,9.0,12.0,18.0,
        ............................................. 24.0,36.0,48.0,54.0
    Mobility State................................... Local
    Mobility Move Count.............................. 0
    Security Policy Completed........................ Yes
    Policy Manager State............................. RUN
    Policy Manager Rule Created...................... Yes
    Audit Session ID................................. none
    AAA Role Type.................................... none
    Local Policy Applied............................. none
    IPv4 ACL Name.................................... none
    FlexConnect ACL Applied Status................... Unavailable
    IPv4 ACL Applied Status.......................... Unavailable
    IPv6 ACL Name.................................... none
    IPv6 ACL Applied Status.......................... Unavailable
    Layer2 ACL Name.................................. none
    Layer2 ACL Applied Status........................ Unavailable
    mDNS Status...................................... Disabled
    mDNS Profile Name................................ none
    No. of mDNS Services Advertised.................. 0
    Policy Type...................................... N/A
    Encryption Cipher................................ None
    Protected Management Frame ...................... No
    Management Frame Protection...................... No
    EAP Type......................................... Unknown
    FlexConnect Data Switching....................... Local
    FlexConnect Dhcp Status.......................... Local
    FlexConnect Vlan Based Central Switching......... No
    FlexConnect Authentication....................... Central
    Quarantine VLAN.................................. 0
    Access VLAN...................................... 321
    Client Capabilities:
          CF Pollable................................ Not implemented
          CF Poll Request............................ Not implemented
          Short Preamble............................. Implemented
          PBCC....................................... Not implemented
          Channel Agility............................ Not implemented
          Listen Interval............................ 10
          Fast BSS Transition........................ Not implemented
    Client Wifi Direct Capabilities:
          WFD capable................................ No
          Manged WFD capable......................... No
          Cross Connection Capable................... No
          Support Concurrent Operation............... No
    Fast BSS Transition Details:
    Client Statistics:
          Number of Bytes Received................... 2526655
          Number of Bytes Sent....................... 2425132
          Total Number of Bytes Sent................. 2425132
          Total Number of Bytes Recv................. 2526655
          Number of Bytes Sent (last 90s)............ 64
          Number of Bytes Recv (last 90s)............ 6764
          Number of Packets Received................. 25105
          Number of Packets Sent..................... 5996
          Number of Interim-Update Sent.............. 0
          Number of EAP Id Request Msg Timeouts...... 0
          Number of EAP Id Request Msg Failures...... 0
          Number of EAP Request Msg Timeouts......... 0
          Number of EAP Request Msg Failures......... 0
          Number of EAP Key Msg Timeouts............. 0
          Number of EAP Key Msg Failures............. 0
          Number of Data Retries..................... 1018
          Number of RTS Retries...................... 0
          Number of Duplicate Received Packets....... 56
          Number of Decrypt Failed Packets........... 0
          Number of Mic Failured Packets............. 0
          Number of Mic Missing Packets.............. 0
          Number of RA Packets Dropped............... 0
          Number of Policy Errors.................... 0
          Radio Signal Strength Indicator............ -60 dBm
          Signal to Noise Ratio...................... 24 dB
    Client Rate Limiting Statistics:
          Number of Data Packets Recieved............ 0
          Number of Data Rx Packets Dropped.......... 0
          Number of Data Bytes Recieved.............. 0
          Number of Data Rx Bytes Dropped............ 0
          Number of Realtime Packets Recieved........ 0
          Number of Realtime Rx Packets Dropped...... 0
          Number of Realtime Bytes Recieved.......... 0
          Number of Realtime Rx Bytes Dropped........ 0
          Number of Data Packets Sent................ 0
          Number of Data Tx Packets Dropped.......... 0
          Number of Data Bytes Sent.................. 0
          Number of Data Tx Bytes Dropped............ 0
          Number of Realtime Packets Sent............ 0
          Number of Realtime Tx Packets Dropped...... 0
          Number of Realtime Bytes Sent.............. 0
          Number of Realtime Tx Bytes Dropped........ 0
    Nearby AP Statistics:
          AP-INDE-108(slot 0)
            antenna0: 5364 secs ago.................. -74 dBm
            antenna1: 5364 secs ago.................. -87 dBm
          AP-INDE-106(slot 0)
            antenna0: 5364 secs ago.................. -67 dBm
            antenna1: 5364 secs ago.................. -57 dBm
          AP-INDE-106(slot 1)
            antenna0: 5363 secs ago.................. -82 dBm
            antenna1: 5363 secs ago.................. -87 dBm
          AP-INDE-111(slot 0)
            antenna0: 5364 secs ago.................. -94 dBm
            antenna1: 5364 secs ago.................. -97 dBm
          AP-INDE-119(slot 0)
            antenna0: 5364 secs ago.................. -87 dBm
            antenna1: 5364 secs ago.................. -91 dBm
          AP-INDE-105(slot 0)
            antenna0: 5364 secs ago.................. -68 dBm
            antenna1: 5364 secs ago.................. -79 dBm
          AP-INDE-105(slot 1)
            antenna0: 5363 secs ago.................. -90 dBm
            antenna1: 5363 secs ago.................. -87 dBm
          AP-INDE-109(slot 0)
            antenna0: 5364 secs ago.................. -75 dBm
            antenna1: 5364 secs ago.................. -85 dBm
          AP-INDE-109(slot 1)
            antenna0: 5364 secs ago.................. -83 dBm
            antenna1: 5364 secs ago.................. -78 dBm
          AP-INDE-121(slot 0)
            antenna0: 14490 secs ago................. -91 dBm
            antenna1: 14490 secs ago................. -92 dBm
          AP-INDE-126(slot 0)
            antenna0: 8132 secs ago.................. -89 dBm
            antenna1: 8132 secs ago.................. -92 dBm
          AP-INDE-126(slot 1)
            antenna0: 38197 secs ago................. -93 dBm
            antenna1: 38197 secs ago................. -83 dBm
          AP-INDE-116(slot 0)
            antenna0: 5364 secs ago.................. -61 dBm
            antenna1: 5364 secs ago.................. -50 dBm
          AP-INDE-116(slot 1)
            antenna0: 5364 secs ago.................. -82 dBm
            antenna1: 5364 secs ago.................. -86 dBm
          AP-INDE-112(slot 0)
            antenna0: 5364 secs ago.................. -71 dBm
            antenna1: 5364 secs ago.................. -71 dBm
          AP-INDE-112(slot 1)
            antenna0: 5364 secs ago.................. -88 dBm
            antenna1: 5364 secs ago.................. -90 dBm
          AP-INDE-107(slot 0)
            antenna0: 8129 secs ago.................. -91 dBm
            antenna1: 8129 secs ago.................. -85 dBm
          AP-INDE-118(slot 0)
            antenna0: 5364 secs ago.................. -94 dBm
            antenna1: 5364 secs ago.................. -91 dBm
          AP-INDE-114(slot 0)
            antenna0: 5364 secs ago.................. -93 dBm
            antenna1: 5364 secs ago.................. -85 dBm
          AP-INDE-114(slot 1)
            antenna0: 38197 secs ago................. -93 dBm
            antenna1: 38197 secs ago................. -91 dBm
          AP-INDE-123(slot 0)
            antenna0: 5364 secs ago.................. -72 dBm
            antenna1: 5364 secs ago.................. -83 dBm
          AP-INDE-103(slot 0)
            antenna0: 5364 secs ago.................. -91 dBm
            antenna1: 5364 secs ago.................. -83 dBm
          AP-INDE-104(slot 0)
            antenna0: 5364 secs ago.................. -87 dBm
            antenna1: 5364 secs ago.................. -90 dBm
          AP-INDE-102(slot 0)
            antenna0: 5364 secs ago.................. -90 dBm
            antenna1: 5364 secs ago.................. -87 dBm
    DNS Server details:
          DNS server IP ............................. 0.0.0.0
          DNS server IP ............................. 0.0.0.0
    Assisted Roaming Prediction List details:
     Client Dhcp Required:     True
    Allowed (URL)IP Addresses
    (Cisco Controller) >show client detail ec:59:e7:e9:e5:68
    Client MAC Address............................... ec:59:e7:e9:e5:68
    Client Username ................................. N/A
    AP MAC Address................................... 44:ad:d9:57:fd:20
    AP Name.......................................... AP-INDE-106
    AP radio slot Id................................. 0
    Client State..................................... Associated
    Client NAC OOB State............................. Access
    Wireless LAN Id.................................. 1
    Hotspot (802.11u)................................ Not Supported
    BSSID............................................ 44:ad:d9:57:fd:20
    Connected For ................................... 3043 secs
    Channel.......................................... 11
    IP Address....................................... 192.168.0.162
    Gateway Address.................................. Unknown
    Netmask.......................................... Unknown
    Association Id................................... 4
    Authentication Algorithm......................... Open System
    Reason Code...................................... 1
    Status Code...................................... 0
    Session Timeout.................................. 15000
    Client CCX version............................... No CCX support
    QoS Level........................................ Silver
    Avg data Rate.................................... 0
    Burst data Rate.................................. 0
    Avg Real time data Rate.......................... 0
    Burst Real Time data Rate........................ 0
    802.1P Priority Tag.............................. disabled
    CTS Security Group Tag........................... Not Applicable
    KTS CAC Capability............................... No
    WMM Support...................................... Enabled
      APSD ACs.......................................  BK  BE  VI  VO
    Power Save....................................... ON
    Current Rate..................................... m7
    Supported Rates.................................. 5.5,11.0,6.0,9.0,12.0,18.0,
        ............................................. 24.0,36.0,48.0,54.0
    Mobility State................................... Local
    Mobility Move Count.............................. 0
    Security Policy Completed........................ Yes
    Policy Manager State............................. RUN
    Policy Manager Rule Created...................... Yes
    Audit Session ID................................. none
    AAA Role Type.................................... none
    Local Policy Applied............................. none
    IPv4 ACL Name.................................... none
    FlexConnect ACL Applied Status................... Unavailable
    IPv4 ACL Applied Status.......................... Unavailable
    IPv6 ACL Name.................................... none
    IPv6 ACL Applied Status.......................... Unavailable
    Layer2 ACL Name.................................. none
    Layer2 ACL Applied Status........................ Unavailable
    mDNS Status...................................... Disabled
    mDNS Profile Name................................ none
    No. of mDNS Services Advertised.................. 0
    Policy Type...................................... N/A
    Encryption Cipher................................ None
    Protected Management Frame ...................... No
    Management Frame Protection...................... No
    EAP Type......................................... Unknown
    FlexConnect Data Switching....................... Local
    FlexConnect Dhcp Status.......................... Local
    FlexConnect Vlan Based Central Switching......... No
    FlexConnect Authentication....................... Central
    Quarantine VLAN.................................. 0
    Access VLAN...................................... 321
    Client Capabilities:
          CF Pollable................................ Not implemented
          CF Poll Request............................ Not implemented
          Short Preamble............................. Implemented
          PBCC....................................... Not implemented
          Channel Agility............................ Not implemented
          Listen Interval............................ 1
          Fast BSS Transition........................ Not implemented
    Client Wifi Direct Capabilities:
          WFD capable................................ No
          Manged WFD capable......................... No
          Cross Connection Capable................... No
          Support Concurrent Operation............... No
    Fast BSS Transition Details:
    Client Statistics:
          Number of Bytes Received................... 13499
          Number of Bytes Sent....................... 7662
          Total Number of Bytes Sent................. 7662
          Total Number of Bytes Recv................. 13499
          Number of Bytes Sent (last 90s)............ 0
          Number of Bytes Recv (last 90s)............ 0
          Number of Packets Received................. 184
          Number of Packets Sent..................... 69
          Number of Interim-Update Sent.............. 0
          Number of EAP Id Request Msg Timeouts...... 0
          Number of EAP Id Request Msg Failures...... 0
          Number of EAP Request Msg Timeouts......... 0
          Number of EAP Request Msg Failures......... 0
          Number of EAP Key Msg Timeouts............. 0
          Number of EAP Key Msg Failures............. 0
          Number of Data Retries..................... 61
          Number of RTS Retries...................... 0
          Number of Duplicate Received Packets....... 2
          Number of Decrypt Failed Packets........... 0
          Number of Mic Failured Packets............. 0
          Number of Mic Missing Packets.............. 0
          Number of RA Packets Dropped............... 0
          Number of Policy Errors.................... 0
          Radio Signal Strength Indicator............ -70 dBm
          Signal to Noise Ratio...................... 18 dB
    Client Rate Limiting Statistics:
          Number of Data Packets Recieved............ 0
          Number of Data Rx Packets Dropped.......... 0
          Number of Data Bytes Recieved.............. 0
          Number of Data Rx Bytes Dropped............ 0
          Number of Realtime Packets Recieved........ 0
          Number of Realtime Rx Packets Dropped...... 0
          Number of Realtime Bytes Recieved.......... 0
          Number of Realtime Rx Bytes Dropped........ 0
          Number of Data Packets Sent................ 0
          Number of Data Tx Packets Dropped.......... 0
          Number of Data Bytes Sent.................. 0
          Number of Data Tx Bytes Dropped............ 0
          Number of Realtime Packets Sent............ 0
          Number of Realtime Tx Packets Dropped...... 0
          Number of Realtime Bytes Sent.............. 0
          Number of Realtime Tx Bytes Dropped........ 0
    Nearby AP Statistics:
          AP-INDE-120(slot 0)
            antenna0: 36159 secs ago................. -98 dBm
            antenna1: 36159 secs ago................. -97 dBm
          AP-INDE-115(slot 0)
            antenna0: 11075 secs ago................. -96 dBm
            antenna1: 11075 secs ago................. -96 dBm
          AP-INDE-108(slot 0)
            antenna0: 188 secs ago................... -96 dBm
            antenna1: 188 secs ago................... -95 dBm
          AP-INDE-106(slot 0)
            antenna0: 188 secs ago................... -78 dBm
            antenna1: 188 secs ago................... -67 dBm
          AP-INDE-111(slot 0)
            antenna0: 1451 secs ago.................. -98 dBm
            antenna1: 1451 secs ago.................. -95 dBm
          AP-INDE-119(slot 0)
            antenna0: 188 secs ago................... -87 dBm
            antenna1: 188 secs ago................... -95 dBm
          AP-INDE-122(slot 0)
            antenna0: 73165 secs ago................. -95 dBm
            antenna1: 73165 secs ago................. -95 dBm
          AP-INDE-105(slot 0)
            antenna0: 188 secs ago................... -85 dBm
            antenna1: 188 secs ago................... -86 dBm
          AP-INDE-109(slot 0)
            antenna0: 332 secs ago................... -91 dBm
            antenna1: 332 secs ago................... -89 dBm
          AP-INDE-121(slot 0)
            antenna0: 2708 secs ago.................. -98 dBm
            antenna1: 2708 secs ago.................. -96 dBm
          AP-INDE-126(slot 0)
            antenna0: 215 secs ago................... -84 dBm
            antenna1: 215 secs ago................... -86 dBm
          AP-INDE-116(slot 0)
            antenna0: 188 secs ago................... -61 dBm
            antenna1: 188 secs ago................... -61 dBm
          AP-INDE-112(slot 0)
            antenna0: 187 secs ago................... -83 dBm
            antenna1: 187 secs ago................... -85 dBm
          AP-INDE-107(slot 0)
            antenna0: 188 secs ago................... -89 dBm
            antenna1: 188 secs ago................... -90 dBm
          AP-INDE-118(slot 0)
            antenna0: 188 secs ago................... -95 dBm
            antenna1: 188 secs ago................... -98 dBm
          AP-INDE-114(slot 0)
            antenna0: 187 secs ago................... -83 dBm
            antenna1: 187 secs ago................... -85 dBm
          AP-INDE-113(slot 0)
            antenna0: 38981 secs ago................. -94 dBm
            antenna1: 38981 secs ago................. -95 dBm
          AP-INDE-123(slot 0)
            antenna0: 187 secs ago................... -73 dBm
            antenna1: 187 secs ago................... -65 dBm
          AP-INDE-117(slot 0)
            antenna0: 11013 secs ago................. -94 dBm
            antenna1: 11013 secs ago................. -97 dBm
          AP-INDE-103(slot 0)
            antenna0: 187 secs ago................... -70 dBm
            antenna1: 187 secs ago................... -80 dBm
          AP-INDE-104(slot 0)
            antenna0: 214 secs ago................... -95 dBm
            antenna1: 214 secs ago................... -91 dBm
          AP-INDE-102(slot 0)
            antenna0: 215 secs ago................... -87 dBm
            antenna1: 215 secs ago................... -88 dBm
          AP-INDE-100(slot 0)
            antenna0: 11014 secs ago................. -96 dBm
            antenna1: 11014 secs ago................. -96 dBm
          AP-INDE-101(slot 0)
            antenna0: 11013 secs ago................. -96 dBm
            antenna1: 11013 secs ago................. -95 dBm
    DNS Server details:
          DNS server IP ............................. 0.0.0.0
          DNS server IP ............................. 0.0.0.0
    Assisted Roaming Prediction List details:
     Client Dhcp Required:     True
    Allowed (URL)IP Addresses

  • Configuring DHCP snooping

    I am settting up DHCP snooping for the first time on an 3750. My DHCP server resides on another switch. The 3750 is connected through a Gig SFP fiber to a 3550 with DHCP relay.
    Is the following config correct? The client will not get a dhcp with the option 82 enabled.
    (config)#ip dhcp snooping
    (config)#ip dhcp snooping vlan 2-200
    (config)#no ip dhcp snooping info option
    !The client will not get an ip with
    !this option enabled.
    ! trusted interface connected to the 3550
    (config)#int gi1/0/4
    (config-if)#ip dhcp trust
    ! untrusted interface
    (config-if)#ip dhcp limit rate 100
    (config)#ip dhcp snooping database flash:/database1
    (config)#ip dhcp snooping database timeout 30
    (config)#ip dhcp snooping database write-delay 30

    Have you enabled option 82 on your DHCP server? Also, on your DHCP relay switch, configure the following under the VLAN interface in question and see if it makes any difference.
    Example:
    c3550-A(config)#int vlan 1
    c3550-A(config-if)#ip dhcp relay information trusted ?

  • DHCP Snooping

    Hi,
    Is it required to enable dhcp trust on trunk ports if server is connected to a core switches and pc's are connected to access switches. access switch and core switches have trunk ports.

    Thanks Alain,
    But in my case, server is connected to Core switches. We have 2-tier structure.
    Access switches connected to core switches , core switches connected to router and then to wan.
    All PCs are connected to Access Switches.
    Dhcp server is connected to Core Switch.
    Access switch and core switch are connected via trunk ports.
    as shown in the attached visio diagram. My doubt is, is it required to make both the trunk ports on access switches as trust ports and what all need to be considered to implement dhcp snooping this scenario.

  • Ip dhcp snooping issue

       Hi all,
    I am having trouble getting the dhcp snooping to work on a stacked 3750 when a rogue DHCP server is plugged in to the network. I have configured dhcp snooping on one of our user switches with the following commands.
    ip dhcp snooping
    ip dhcp snooping vlan 11
    no ip dhcp snooping information option
    int range fa1/0/1 - 48
    ip dhcp snooping limit rate 100
    VLAN Name                             Status    Ports
    11   JKT_Net_DHCP_1 
    interface FastEthernet1/0/43
    description  DHCP Subnet 1
    switchport access vlan 11
    switchport mode access
    switchport port-security maximum 3
    switchport port-security aging time 1440
    switchport port-security violation restrict
    switchport port-security aging type inactivity
    no logging event link-status
    no snmp trap link-status
    spanning-tree portfast
    spanning-tree bpduguard enable
    ip dhcp snooping limit rate 100
    end
    The configuration works in ther fact that users are still getting their IP address info from the DHCP server and i can see all the dhcp snooping bindings on the switch. But I'm having issues where when a rogue dhcp device is plugged in to one of the user ports i.e fa1/0/43 on the user subnet, and do an ipconfig /release /renew on a machine on the same VLAN, i am still getting a DHCPOFFER from the rogue device and the machine ends up with the wrong IP address.
    Currrently the real DHCP server sits off a network behind the firewall, with a layer 3 link (running OSPF) between the user switch to the distribution switch. I have enabled the dhcp snooping on the link from the distribution switch to the real DHCP server (shown below).
    DHCP snooping trusted interface
    interface GigabitEthernet1/0/9
    description JKTADC01 - LAC 1
    switchport access vlan 21
    switchport mode access
    no snmp trap link-status
    ip dhcp snooping trust
    end
    I have also attached a network diagram of the network setup.
    I would like to stop the rogue server from being able to give out ip addresses.
    Can someone shed some light on this topic please?
    Kind regards,
    Philip

    Pawan,
    Based on the error messages it looks like you have a mis-configuration. Looks like
    one of the trunks/ports does not have DHCP trust configured on it. Can you
    track mac address 34dc.fde5.2c40 to what port it's connected to and verify
    that it has DHCP trust enabled?.
    Haihua

  • High cpu with dhcp snooping

    Hi all,
    I am using 2950T and have configured dhcp snooping with this config:
    conf t
    ip dhcp snooping
    ip dhcp snooping vlan 416
    int range fa0/1 - 24
    ip dhcp snooping limit rate 50
    int gig0/1 (Uplink)
    ip dhcp snooping trust
    int gig0/2
    ip dhcp snooping trust (uplink)
    After this the 2950 goes up to 80% cpu, and is barely accessible.
    Have i done something wrong, or will the cpu return to 20%?
    //Robert Pettersson
    senior network engineer, WetterNet

    Well,
    In Cisco Bug Toolkit there are couple of articles which looks similar to yours.
    The first thing to check now is the option-82. It is enabled by default so would be interesting to see what's happen if you disable it.
    Otherwise it would be better if you can open case at Cisco because it could be that your problem depends on some other features enabled on the switch.
    //Mikhail Galiulin

  • Problem with hostname after enabling dhcp

    i just installed a solaris10 non-networked because there was no network connection when i installed it. but recently, we were able to connect it to a network which required me to enable dhcp which i did with a sys-unconfig command.
    the problem is, the hostname i have for this machine is currently "unknown" and i don't know how to set it to another name,
    i've tried the procedure in doc.sun.com but still will not work.
    thanks

    Hello,
    I had the same problem with Solaris 9 for 3 months.
    I used the following documentation :
    #3477
    2. For Solaris 8 systems.
    Edit the file /etc/init.d/network and change the line that reads
    "dhcp") hostname=`/sbin/dhcpinfo Hostname` ;;
    to
    # "dhcp") hostname=`/sbin/dhcpinfo Hostname` ;;
    "dhcp") hostname=`shcat /etc/nodename` ;;
    Then, edit the file /etc/init.d/inetsvc and change the line that reads
    hostname=`/sbin/dhcpinfo Hostname`
    to
    # hostname=`/sbin/dhcpinfo Hostname`
    hostname=`/usr/bin/cat /etc/nodename`
    Save the files and reboot the system. The system's hostname will be the
    entry in the file /etc/nodename.
    Else try the docid : 71848
    Good luck

Maybe you are looking for