Option 82 on Cisco switches.

Hi!
I have a question about how does option 82 work on cisco switches.
From one source, i read that Cisco switches always insert option 82 in every dhcp request by default.
From another source, i read that Cisco switches will insert option 82 information only if dhcp relay configured.
Which statement is correct?
Thanks!

Paul, thanks for reply!
Also, nice explanation from Peter Paluch here:
https://supportforums.cisco.com/discussion/11703441/dhcp-snooping-not-working-dropping-packets
But i still have a problem with it.
I have tested insertion of option 82 in following configuration:
One 2960S switch, and two notebooks connected to it in vlan 1:
DHCP snooping and option 82 insertion are enabled:
DHCP snooping is configured on following VLANs:
1
DHCP snooping is operational on following VLANs:
1
PC1 is configured for DHCP. PC2 is used for wireshark to sniff traffic.
As i understand, if dhcp snooping is not enabled, PC2 will receive dhcp request from PC1 without option 82.
If dhcp snooping is enabled , PC2 will receive DHCP request from PC WITH option 82.
However, in second case i dont see option 82 in wireshark.
But why?

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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
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3. Another RADIUS Access-Request (1) is beging received by the NPS Server
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It only took like.. uhm.. forever.. but there's an answer which is "OK ish..".
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following is the debug output>>
06:36:43: dot1x-packet:Received an EAP packet on interface FastEthernet0/11
06:36:43: EAPOL pak dump rx
06:36:43: EAPOL Version: 0x1 type: 0x0 length: 0x0006
06:36:43: dot1x-packet:Received an EAP packet on the FastEthernet0/11 from mac 0019.b981.e812
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06:36:43:     dot1x_auth_bend Fa0/11: during state auth_bend_request, got event 6(eapolEap)
06:36:43: @@@ dot1x_auth_bend Fa0/11: auth_bend_request -> auth_bend_response
06:36:43: dot1x-sm:Fa0/11:0019.b981.e812:auth_bend_response_enter called
06:36:43: dot1x-ev:dot1x_sendRespToServer: Response sent to the server from 0019.b981.e812
06:36:43: dot1x-sm:Fa0/11:0019.b981.e812:auth_bend_request_response_action called
06:36:43: RADIUS/ENCODE(00000049):Orig. component type = DOT1X
06:36:43: RADIUS(00000049): Config NAS IP: 192.168.2.250
06:36:43: RADIUS/ENCODE(00000049): acct_session_id: 73
06:36:43: RADIUS(00000049): sending
06:36:43: RADIUS(00000049): Send Access-Request to 192.168.2.231:1812 id 1645/99, len 267
06:36:43: RADIUS: authenticator 5B 61 1D 64 D3 D5 9F AD - 23 E0 11 11 B3 C3 5C 81
06:36:43: RADIUS: User-Name           [1]   6   "test"
06:36:43: RADIUS: Service-Type        [6]   6   Framed                    [2]
06:36:43: RADIUS: Framed-MTU          [12] 6   1500
06:36:43: RADIUS: Called-Station-Id   [30] 19 "00-11-5C-6E-5E-0B"
06:36:43: RADIUS: Calling-Station-Id [31] 19 "00-19-B9-81-E8-12"
06:36:43: RADIUS: EAP-Message         [79] 8
06:36:43: RADIUS:   02 7A 00 06 0D 00                 [ z]
06:36:43: RADIUS: Message-Authenticato[80] 18
06:36:43: RADIUS:   A6 AB 5A CA ED B8 B4 1E 36 00 9D AB 1A F6 B9 E0                [ Z6]
06:36:43: RADIUS: Vendor, Cisco       [26] 49
06:36:43: RADIUS:   Cisco AVpair       [1]   43 "audit-session-id=C0A802FA0000006F016B36D8"
06:36:43: RADIUS: NAS-Port-Type       [61] 6   Ethernet                  [15]
06:36:43: RADIUS: NAS-Port            [5]   6   50011
06:36:43: RADIUS: NAS-Port-Id         [87] 18 "FastEthernet0/11"
06:36:43: RADIUS: State               [24] 80
06:36:43: RADIUS:   33 37 43 50 4D 53 65 73 73 69 6F 6E 49 44 3D 43 [37CPMSessionID=C]
06:36:43: RADIUS:   30 41 38 30 32 46 41 30 30 30 30 30 30 36 46 30 [0A802FA0000006F0]
06:36:43: RADIUS:   31 36 42 33 36 44 38 3B 33 35 53 65 73 73 69 6F [16B36D8;35Sessio]
06:36:43: RADIUS:   6E 49 44 3D 69 73 65 2D 73 65 72 76 65 72 2D 31 [nID=ise-server-1]
06:36:43: RADIUS:   2F 31 37 31 30 32 35 39 38 38 2F 32 34 3B    [ /171025988/24;]
06:36:43: RADIUS: NAS-IP-Address      [4]   6   192.168.2.250
06:36:43: %LINK-3-UPDOWN: Interface FastEthernet0/11, changed state to up
06:36:43: RADIUS: Received from id 1645/99 192.168.2.231:1812, Access-Challenge, len 1134
06:36:43: RADIUS: authenticator 78 36 A3 38 30 1C F0 7A - 19 83 93 81 B4 6B FF 9E
06:36:43: RADIUS: State               [24] 80
06:36:43: RADIUS:   33 37 43 50 4D 53 65 73 73 69 6F 6E 49 44 3D 43 [37CPMSessionID=C]
06:36:43: RADIUS:   30 41 38 30 32 46 41 30 30 30 30 30 30 36 46 30 [0A802FA0000006F0]
06:36:43: RADIUS:   31 36 42 33 36 44 38 3B 33 35 53 65 73 73 69 6F [16B36D8;35Sessio]
06:36:43: RADIUS:   6E 49 44 3D 69 73 65 2D 73 65 72 76 65 72 2D 31 [nID=ise-server-1]
06:36:43: RADIUS:   2F 31 37 31 30 32 35 39 38 38 2F 32 34 3B    [ /171025988/24;]
06:36:43: RADIUS: EAP-Message         [79] 255
06:36:43: RADIUS:   4D 5D 13 47 FC 46 16 EE 62 76 40 09 77 48 31 B6 01 6B 5E 52 33 56 A2 1E 34 [M]GFbv@wH1k^R3V4]
06:36:43: RADIUS:   02 32 39 FA 4D CA 79 18 4A 42 A2 4E 5C BD AE 29 D2 3D D1 5A FC C2 ED 3E E5 FB C6 B8 D8 DE A8 75 EB 3A A5 7D 02 03 01 00 01 A3 81 CD 30 [29MyJBN\)=Z>u:}0]
06:36:43: RADIUS:   81 CA 30 0B 06 03 55 1D 0F 04 04 03 02 01 86 30 0F 06 03 55 1D 13 01 01 FF 04 05 30 03 01 01 FF 30 1D 06 03 55 1D 0E 04 16 04 14 C4 56 80 A7 C9 18 50 92 EE CC 91 D4 E1 EC DB AD E7 1E 70 A8 30 79 06 03 55 1D 1F 04 72 30 70 [0U0U00UVPp0yUr0p]
06:36:43: RADIUS:   30 6E A0 6C A0 6A 86 32 68 74 74 70 3A 2F 2F 73 79 73 6C [0nlj2http://sysl]
06:36:43: RADIUS:   6F 67 2D 73 65 72 76 65 72 2F 43 65 72 74 45 6E [og-server/CertEn]
06:36:43: RADIUS:   72 6F 6C 6C 2F 46 4D 46 42 5F 54 72 75 73 74 65 [roll/FMFB_Truste]
06:36:43: RADIUS:   64 43 41 2E 63 72 6C 86 34 66 69 6C 65 3A 2F 2F 5C [dCA.crl4file://\]
06:36:43: RADIUS:   5C 73 79 73 6C 6F 67 2D 73 65 72 76 65 72 5C 43 [\syslog-server\C]
06:36:43: RADIUS:   65 72 74 45 6E 72 6F 6C 6C 5C 46 4D 46 42 5F 54 [ertEnroll\FMFB_T]
06:36:43: RADIUS:   72 75 73 74 65 64 43 41 2E         [ rustedCA.]
06:36:43: RADIUS: EAP-Message         [79] 251
06:36:43: RADIUS:   63 72 6C 30 10 06 09 2B 06 01 04 01 82 37 15 01 04 03 02 01 00 30 0D 06 09 2A 86 48 86 F7 0D 01 01 05 05 00 03 82 01 01 00 63 BA F8 CE D5 8B 0E 94 77 AE 86 6C 37 AB 2F 36 9A B2 85 D5 4A [crl0+70*Hcwl7/6J]
06:36:43: RADIUS:   74 8C 33 F5 93 06 A6 57 8D 39 56 8F 02 08 97 CB C6 08 70 8C 22 1E 5D 1F A8 26 6D 60 1F 05 62 D1 24 AB 03 8C 41 F8 1C F1 F8 C2 87 8B 97 02 71 FC 6A [t3W9Vp"]&m`b$Aqj]
06:36:43: RADIUS:   EB 12 FC DD 8C 5C 9C 2D AF D2 C4 1C 18 1B 40 BE 78 B0 54 55 59 89 03 1B B7 FB 91 85 EE CA C0 18 1C 78 5D 4D BA FA 9E 44 D3 45 53 A3 BE 46 8A FB 81 BD F1 4C B3 3B [\-@xTUYx]MDESFL;]
06:36:43: RADIUS:   D6 66 7E 5B 79 9F 83 53 5E 49 92 B5 7F E5 1A E2 86 8C 83 96 7D 75 A5 1D 08 4E 32 C3 5E EC BF 28 53 EC 53 8A C3 E0 36 [f~[yS^I}uN2^(SS6]
06:36:43: RADIUS:   82 EE AA 0D 38 3E BA 9C 1D D9 24 BD 48 A6 EE 44 BD 95 68 85 CA 8C 44 F8 E8 A2 FB 94 BC 6F 7C F2 06 91 6C A0 A6 BB 7B 7F 56 BD 15 32 A4     [ 8>$HDhDo|l{V2]
06:36:43: RADIUS: Message-Authenticato[80] 18
06:36:43: RADIUS:   DD 82 F7 10 3F C7 B5 62 9B 2A BB 24 16 A7 59 33            [ ?b*$Y3]
06:36:44: RADIUS(00000049): Received from id 1645/99
06:36:44: RADIUS/DECODE: EAP-Message fragments, 253+253+253+249, total 1008 bytes
06:36:44: dot1x-packet:Received an EAP request packet from EAP for mac 0019.b981.e812
06:36:44: dot1x-sm:Posting EAP_REQ on Client=1D68028
06:36:44:     dot1x_auth_bend Fa0/11: during state auth_bend_response, got event 7(eapReq)
06:36:44: @@@ dot1x_auth_bend Fa0/11: auth_bend_response -> auth_bend_request
06:36:44: dot1x-sm:Fa0/11:0019.b981.e812:auth_bend_response_exit called
06:36:44: dot1x-sm:Fa0/11:0019.b981.e812:auth_bend_request_enter called
06:36:44: dot1x-packet:dot1x_mgr_send_eapol :EAP code: 0x1 id: 0x7B length: 0x03F0 type: 0xD data: @Cfui[ab2,Jt1){                                                                                                                              2]g&GZ1pIbu;+Ga;iF"jy#
oohuV.aFZ4_|
P0`At   )B
06:36:44: dot1x-ev:FastEthernet0/11:Sending EAPOL packet to group PAE address
06:36:44: dot1x-ev:dot1x_mgr_pre_process_eapol_pak: Role determination not required on FastEthernet0/11.
06:36:44: RADIUS: Message-Authenticato[80] 18
06:36:44: RADIUS:   F5 B0 56 D3 C6 87 BD 10 6E C7 4A 72 5B 5C 60 C5           [ VnJr[\`]
06:36:44: RADIUS: Vendor, Cisco       [26] 49
06:36:44: RADIUS:   Cisco AVpair       [1]   43 "audit-session-id=C0A802FA0000006F016B36D8"
06:36:44: RADIUS: NAS-Port-Type       [61] 6   Ethernet                  [15]
06:36:44: RADIUS: NAS-Port            [5]   6   50011
06:36:44: RADIUS: NAS-Port-Id         [87] 18 "FastEthernet0/11"
06:36:44: RADIUS: State               [24] 80
06:36:44: RADIUS:   33 37 43 50 4D 53 65 73 73 69 6F 6E 49 44 3D 43 [37CPMSessionID=C]
06:36:44: RADIUS:   30 41 38 30 32 46 41 30 30 30 30 30 30 36 46 30 [0A802FA0000006F0]
06:36:45: dot1x-ev:FastEthernet0/11:Sending EAPOL packet to group PAE address
06:36:45: dot1x-ev:dot1x_mgr_pre_process_eapol_pak: Role determination not required on FastEthernet0/11.
06:36:45: dot1x-registry:registry:dot1x_ether_macaddr called
06:36:45: dot1x-ev:dot1x_mgr_send_eapol: Sending out EAPOL packet on FastEthernet0/11
06:36:45: EAPOL pak dump Tx
06:36:45: EAPOL Version: 0x2 type: 0x0 length: 0x0039
06:36:45: EAP code: 0x1 id: 0x7E length: 0x0039 type: 0xD
06:36:45: dot1x-packet:dot1x_txReq: EAPOL packet sent to client (0019.b981.e812)
06:36:45: dot1x-sm:Fa0/11:0019.b981.e812:auth_bend_response_request_action called
06:36:46: dot1x-ev:dot1x_mgr_pre_process_eapol_pak: Role determination not required on FastEthernet0/11.
06:36:46: dot1x-packet:dot1x_mgr_process_eapol_pak: queuing an EAPOL pkt on Authenticator Q
06:36:46: dot1x-ev:Enqueued the eapol packet to the global authenticator queue
06:36:46: EAPOL pak dump rx
06:36:46: EAPOL Version: 0x1 type: 0x0 length: 0x0006
06:36:46: dot1x-ev:
dot1x_auth_queue_event: Int Fa0/11 CODE= 2,TYPE= 13,LEN= 6
06:36:46: dot1x-packet:Received an EAPOL frame on interface FastEthernet0/11
06:36:46: dot1x-ev:Received pkt saddr =0019.b981.e812 , daddr = 0180.c200.0003,
                    pae-ether-type = 888e.0100.0006
06:36:46: dot1x-ev:dot1x_auth_process_eapol: EAPOL flag status of the port Fa0/11 is TRUE

Cisco switches and virtual ip address(load balancing address) on xenapp portals

Hi I am quite new in configuring cisco switches and stumble across an issue after installing xenapp7.6 with load balanced portal to the ddc`s
It seems i only can ping or get access to portal if using real ip address behind cisco switch from other subnets in my network.
I can ping ddc01 and ddc02 and connect to the portal with http without problem. However when i triy to access the load balancing address of the ddc`s
it wont answer to ping or http
In same subnett it is no problem connecting to the load balancing address of the ddc`s, but in loactions on other subnets i only can access real server ip
eks
dd01 192.168.1.4 ok ping and access behind cisco switch from subnets
ddc02 192.168.1.5 ok to ping access behind cisco switch from subnets
load balancing for both ddc 192.168.1.6 not able to get answer og access from subnets, only in same subnett
Is there any way to configure switch to access the load balancing address of the ddc`s ?
Regards
Pål Arne Røberg

Wrong forum. This forum is dedicated to feedback related to CSC framework itself. You should not wish for response here.
Moved by moderator, no longer apply.

Collecting information from Cisco switchs using SNMP

Dear All,
I have a wide network with more than 250 sites connected using the DSL. the WAN devices are under the provider responsability and the LAN devices are directly in my responsability. In each site, I have :
1 or 2 Cisco switchs (2960 or 3560), connecting via fibr.
or
Linksys switch connected via ethernet cable
and
cisco 877 router connected to switch
cisco 881G router conected to switch
pc and printers
In order to improve the availibilty of our network, we lauch every day a script from local pc to test connectivity of LAN equipements :
ping to switchs (Vlan 1), ping to ip fa0/0 cisco router1, ip cisco router2, ping to HSRP address (of two router). the resulting ini file will be inserted in a database and exported to excel for analysing.
I'm asking if someone can help in order to implement SNMP and let me know the name of cisco MIB to implement to :
- to have from SNMP information, the result of show cdp nei, show interface status, show ip int brief,...
- to have if wan router LAN interface are up,connected
- others usefuls informations.
Thanks and regards,
AA

Hi,
the basic SNMP config for 2960 and 3560 is:
     snmp-server community <> RO
The configuration for SNMP traps to get alerts from the device if there is for example a failure with a fan is:
          snmp-server enable traps
          snmp-server host <> <>
This enables all traps available with your IOS version. You can the disable not wanted traps by using the "no"-command like this.
Example for dot1x traps:
          no snmp-server enable traps dot1x
With a snmp client you can then do a snmpwalk (or snmp get) without a specific OID to get all the SNMP information from the device:
On a Linux server the following command should work:
     snmpwalk -v 2c -c <> -T <>
-v = use SNMP version 2c
-c = use the community string you configured on the device
-T = output in the dotted decimal format
But be careful, this will be a lot of data output.
Here you will find a docu for configuring SNMP on a Cisco device:
http://www.cisco.com/en/US/docs/ios/12_2/configfun/configuration/guide/fcf014.html
Sven

What's "SAVE" configuration command for Cisco switch/ router?

What's "SAVE" configuration command for Cisco switch / router? I know Switch#copy running-config startup-config works well,
but so long, any other command that easy to remenber?

What's "SAVE" configuration command for Cisco switch / router? I know Switch#copy running-config startup-config works well, but so long,
any other command that easy to remenber?
yes, here: Switch#write,and want to know more about the Cisco switch, please visit:http://www.3anetwork.com/cisco-switches-price_c1

Option 82 on Cisco switches.

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