DHCP for Voice VLAN

Hi,
I am configuring DHCP pool for voice vlan on cisco 2921 router.
Here is the setup.
2921 router -> 3750 -> 2960 PoE -> 7942 IP Phone
Router Config
ip dhcp excluded-address 10.146.54.1 10.146.89.50
ip dhcp pool VoiceVlan
network 10.146.54.0 255.255.255.0
subnet prefix-length 24
dns-server 10.144.68.32 10.144.68.33
option 150 ip 10.146.68.36
default-router 10.146.54.1
netbios-name-server 10.144.68.32 10.144.68.33
netbios-node-type h-node
domain-name wft.root.loc
lease 0 8
interface GigabitEthernet0/0
ip address 10.144.54.16 255.255.255.0
duplex full
speed 1000
interface GigabitEthernet0/0.50
encapsulation dot1Q 50
ip address 10.146.54.15 255.255.255.0
3750 Config
interface GigabitEthernet1/0/3
description To Router
switchport access vlan 54
switchport mode access
switchport voice vlan 50
speed 1000
duplex full
spanning-tree portfast
interface Vlan50
description VoiceVLAN
ip address 10.146.54.1 255.255.255.0
interface Vlan54
ip address 10.144.54.1 255.255.255.0
2960 Config
interface FastEthernet0/1
switchport access vlan 50
switchport mode access
spanning-tree portfast
Troubleshooting
Trunk is formed
2960#sh int tru
Port        Mode             Encapsulation Status        Native vlan
Gi0/3       on               802.1q         trunking      1
Port        Vlans allowed on trunk
Gi0/3       1-4094
Port        Vlans allowed and active in management domain
Gi0/3       1,50,54
Port        Vlans in spanning tree forwarding state and not pruned
Gi0/3       1,50,54
Router received the dhcp discover from IP Phone, but it doesn't issue any IP. Here is the debug log
875525: Feb 13 15:11:26.167 GMT+8: IP: s=0.0.0.0 (GigabitEthernet0/0.50), d=255.255.255.255, len 576, input feature
875526: Feb 13 15:11:26.167 GMT+8:     UDP src=68, dst=67, MCI Check(80), rtype 0, forus FALSE, sendself FALSE, mtu 0, fwdchk FALSE
875527: Feb 13 15:11:26.167 GMT+8: FIBipv4-packet-proc: route packet from GigabitEthernet0/0.50 src 0.0.0.0 dst 255.255.255.255
875528: Feb 13 15:11:26.167 GMT+8: FIBfwd-proc: Default:255.255.255.255/32 receive entry
875529: Feb 13 15:11:26.167 GMT+8: FIBipv4-packet-proc: packet routing failed
875530: Feb 13 15:11:26.167 GMT+8: IP: s=0.0.0.0 (GigabitEthernet0/0.50), d=255.255.255.255, len 576, rcvd 2
875531: Feb 13 15:11:26.167 GMT+8:     UDP src=68, dst=67
875532: Feb 13 15:11:26.167 GMT+8: IP: s=0.0.0.0 (GigabitEthernet0/0.50), d=255.255.255.255, len 576, stop process pak for forus packet
875533: Feb 13 15:11:26.167 GMT+8:     UDP src=68, dst=67
875534: Feb 13 15:11:26.167 GMT+8: DHCPD: client's VPN is .
875535: Feb 13 15:11:26.167 GMT+8: DHCPD: No option 125
875536: Feb 13 15:11:26.167 GMT+8: DHCPD: DHCPDISCOVER received from client 0110.bd18.0149.5b on interface GigabitEthernet0/0.50.
Any help is appreciated.
Cheers!

Dude, look at your DHCP exclude on your router.
It is supposed to be low/high IP.
So basicly you told the router to exclude IP address from 10.146.54.1 to 10.146.89.5.
This means that DHCP will not hand out 10.146.54.1 through 10.146.89.5
try
ip dhcp excluded-address 10.146.54.1 10.146.54.15
Hope this helps.
Also, I know this is years ago but thought I would throw that out there.

Similar Messages

DHCP and voice vlan on Cisco 3560 switch

Greetings,
I'm setting up a Cisco 3560 switch for voice and data comms. I'm looking for documentation with best practice guidelines for the following requirements.
1. Using the Cisco 3560 as a DHCP server - Config examples. Do I need to use different subnets for the voice and data vlans?
2. Layer 2 CoS QoS - I'm connecting Aastra phones as well as notebooks - I've been told that Aastra also makes use of the voice vlan config through LLDP and that Aastra phones supports CDP.
Your assistance will be appreciated.

Hi ,
Cisco recommends that you have a separate vlan for voice and data with different ip subnets for voice and data. You will need to configure the dhcp pool accordingly.
Here is the config guide for setting up IOS DHCP server:
http://www.cisco.com/en/US/docs/ios/12_0t/12_0t1/feature/guide/Easyip2.html
Here is the LAN qos recommendations:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/netstruc.html#wp1044009

Voice VLAN Help Please

My customer has 2 SG300-52P and 5 SG300-28P. We installed a VoIP phone system earlier this year. At the time of install we placed the phone system on the native VLAN 1. Now they want to move the phone system to a new VLAN because their class C subnet is running out of addresses. DHCP is handled by their Active Directory and their router/firewall is an Untangle Box. The SG300 switches have a basic configuration only.
To move the phone system to a new VLAN I created VLAN 20 on every switch. I then turned Auto Voice VLAN on. I have every port on every switch set to trunk. Computers are plugged into back of phones. I then created a virtual interface on the Untangle Box for VLAN 20. The Untangle Box is also handling DHCP for the new VLAN. Active Directory is still handling DHCP for native VLAN.
From each switch I can ping the gateway of the new VLAN. From each computer I can ping the gateway and the phone system on the new VLAN. However, the phones will not grab an address on the VLAN and when they are set to static, they cannot communicate with other devices on the VLAN.
Any help would be highly appreciated. I am not sure what I am overlooking.

Here is an example of part of a working switch config with Zultys phones where voice VLAN is 100 and data VLAN is 10:
vlan database
vlan 10,20,100
exit
voice vlan id 100
interface fastethernet1
description "RCP and Voice"
switchport trunk allowed vlan add 100
switchport trunk native vlan 10
interface fastethernet2
description "RCP and Voice"
switchport trunk allowed vlan add 100
switchport trunk native vlan 10
In your case you need a trunk port with VLAN 20 tagged on your firewall (or an access port to a separate physical port on VLAN 20. The default gateway served to the phone (or put there statically) should be the interface on the IP. Then you may also want to allow inter-vlan routing for admin access or MXIE if you are using it.
One thing to note on Zultys is by default I think the device profile disables LLDP, but on the phones it is enabled out of the box. So the first time a phone downloads its config from the Zultys it may turn of LLDP unless you checked the box to keep it on.

SG300 voice vlan problem with UC520

Hi Forumers'
My problem statement:
- refere to attached topology.png, this is how my network structure look like
- the IP phone after boot cannot get connected, so it can't download the XML config file from UC520. suspicious switching problem.
- my configuration shown at topology.png and my vlan voice config show as voice vlan setting.png
- My requirement is SG300 switch single switchport to carry vlan data and vlan voice.
- what is the trunking mode for voice VLAN siwth a IP phone+data should i configure? is it switchport voice vlan vvid, switchport voice vlan dot1p, switchport voice vlan untagged or switchport voice vlan none to suite above requirement?
thanks
Noel

Hello Noel,
Sorry for the late reply, things have been quite hectic around here lately
1. Why use trunk? the UC520 only have vlan voice (vlan 20)
Do you mean that the data VLAN is handled by another device ? Still I would leave it as a trunk in order to be able manage the UC through the data VLAN. (Unless for security or other reasons you would choose otherwise of course)
2. The UC520 got CUE (voice messaging), how should i design the service module uplink to the core switch?
Nothing in particular has to be done for this, CUE is handled and routed inside the UC520, the CUE vlan (default ID =90) is only used if you have another CUE in the network
1. i guess i did this: swithcport tagged vlan 20, untagged vlan 10. is it ok for this setting?
If the Voice Vlan on the switch and on the UC520 has been defined as VLAN 20 (default = VLAN 100) this is perfect. Verify if both on the UC and on the switch, the voice VLAN ID is set to 20.
1. so if i just point the phone to vlan 20 (vlan voice), should i create the LLDP network policy?
If you are ready to configure the VLAN manually on the phone, you don't need the LLDP policy, that is correct.
The LLDP policy is being used for having the phones automatically choose the VLAN you defined, so you don't need to set it manually.
Hope this answers your questions ?
Best regards,
Nico Muselle
Sr. Network Engineer - CCNA

Applying command switchport voice vlan

Hi everyone,
At customer setup they have implemented VOIP and as they have to meet the deadlines for this project and they are in rush they want all the switch ports where users are connected should be configured for voice vlan.
As we have server,printers and other devices also connected to these switches.
if i configure int range fa0/1 - 48 with voice vlan command will it cause any issue to devices connected to the switch other than user PC?
Regards
MAhesh

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.
Liability Disclaimer
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
Any issues to ports w/o a VoIP phone but configured with a voice VLAN? Well, broadcast traffic on the VoIP VLAN will go to each port configured with a voice VLAN, but on a VoIP VLAN I wouldn't expect there to be too much of this traffic. So it shouldn't be significant.

Setting up a Test Voice VLAN for Lync 2013

I want to set up a second voice vlan to be a test vlan.
In the current situation the customer has voice and data running on vlan1. The customer insist on taking incremental steps to improve QoS. I have advocated separated vlans for voice and data. They just want to move everything (phase 1) to a different
vlan. They want to see how getting all traffic of vlan 1 will improve there performance. Again, I recommended the best practice, they want to try this approach first.
I am conducting a pilot test with just one cx600 IP phone. and a single switchport. I created a new vlan99 using VTP. I configured the switchports on the Cisco 2960-x switch as follows.
#switchport mode access
#switchport access vlan 99
The phone gets its correct vlan id, and pulls its IP from the correct dhcp scope. However the phone displays "connecting with the lync server" for a long time, then "connecting to download its certificates". This takes a long time then fails.
If I change the switchport back to vlan1 it works fine. What can be the problem? Does the vlan99 need to be defined on the lync server? How many vlans can be supported by Lync 2013?
Thank you,
gigiu

Did you set the VLAN Configuration for Lync Phone Edition?
You can check the following links:
http://blog.schertz.name/2011/01/manual-vlan-configuration-for-lync-phone-edition/
http://www.bricomp.com/blogs/post.cfm/dedicated-voice-vlan-for-lync-devices
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please
make sure that you completely understand the risk before retrieving any suggestions from the above link.
Lisa Zheng
TechNet Community Support

Window DHCP Server is not allocting IP to Voice Vlan

Hi,
I HAVE 3560 Switch, Over that two vlan configure Data & Voice respectively. Voice id Vlan 1 and Data Id Vlan 2.Routing is done on this switch and work as L3
DHCP Server is member of Data Vlan which is connected to another 3560 Switch L2. DHCP Server is reachable.On that both vlan configured.
Switch Port configure fr both Vlan ( Switchport access vlan 2 , Switchport voice vlan 1, Switchport mode access)
WHILE Connect any pc to port DHCP server assign ip frm Data Pool while Cisco Ip phones are not getting IP. OPTION 150 is configured in DHCP.
Over both interface IP Helper is configured and pointing to DHCP Server.
For testing point configure DHCP service on switch with voice pool range ;at that moment Cisco IP phone got the IP fron switch DHCP.
Now not able to understand why window dhcp server not assigning ip for Voice.
Both Vlan are in different subnet and having / 24.
Please guide

Hi,
Checked all configuration in network,apply packet tracer and found DHCP not responding on DHCP Req.
Replace DHCP server and now working fine. :)

Cisco sg200 voice vlan dhcp issue

i have cisco sg200 50p connected to cisco 3750 switch. i just wanted to separate voice (vlan2) and data (vlan1) VLANS. I created vlan 2 as my voice VLAN and separate dhcp server for vlan 2 to give ip addresses to phones. however the ip phone connected to my voice vlan (vlan 2) is not receiving ip address from my dhcp server in vlan 2.
the dhcp server is connected to 3750 switch with an access port (vlan2-voice)
two switches are connected via trunk ports and allowed vlan 1&2
ip phone is connected to sg200 via access port (vlan 2) -
note - there is no pc connected to ip phone
I really appreciate if anyone can help me with this issue

Hi Tom
Thank you for the support. The phone is now getting the IP from the DHCP on its own VLAN (vlan2 ) according to your configuration. However i need to configure the auto voice VLAN based on OUI feature which is in SG200 switch.
The problem is, the switch not allowed me to configure auto voice vlan feature when the port connected to IP phone is in ACCESS mode (it has to be a trunk). I know according to cisco catlyst guidelines this is totally incorrect bcz they say "Voice VLAN is only supported on access ports and not on trunk ports, even though the configuration is allowed"
I think its not valid for Small business switches . Anyway, when i make the said port TRUNK it works (by assigning 1U & 2T- automatically).But the phone does not get an IP address from my DHCP server then.
Can you help me with this if I am missing some configuration. Thank you once again

Cisco Catalyst 6500 version 12.2(33)SXI13 configured as DHCP server for a VLAN responds to Windows 7 client with status code NOA

Can anyone help figure out why the Catalyst 6509 is not able to assign an IPv6 address? Thank you.
Cisco Catalyst 6500 version 12.2(33)SXI13 configured as DHCP server for a VLAN responds to Windows 7 client with status code NOADDRS-AVAIL(2). My configuration on the 6500 for the DHCPv6 server is:
ipv6 dhcp database disk0://DHCPV6-DB
ipv6 dhcp pool VLAN206IPV6
prefix-delegation pool VLAN206IPV6-POOL
dns-server 2620:B700:0:1001::53
domain-name global.bio.com
ipv6 local pool VLAN206IPV6-POOL 2620:B700:0:12C7::/65 65
interface Vlan206
description *** IPv6 Subnet ***
ip address 10.2.104.2 255.255.255.0
ipv6 address 2620:B700:0:12C7::2/64
ipv6 nd prefix 2620:B700:0:12C7::/64 14400 14400 no-autoconfig
ipv6 nd managed-config-flag
ipv6 dhcp server VLAN206IPV6
standby version 2
standby 0 ip 10.2.104.1
standby 0 preempt
standby 6 ipv6 2620:B700:0:12C7::1/64
standby 6 preempt
I'm getting a result from my debug as follows:
Apr 10 16:28:02.873 PDT: %LINK-3-UPDOWN: Interface GigabitEthernet2/2, changed state to up
Apr 10 16:28:02.873 PDT: %LINK-SP-3-UPDOWN: Interface GigabitEthernet2/2, changed state to up
Apr 10 16:28:02.877 PDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/2, changed state to up
Apr 10 16:28:03.861 PDT: IPv6 DHCP: Received SOLICIT from FE80::5D5E:7EBD:CDBF:2519 on Vlan206
Apr 10 16:28:03.861 PDT: IPv6 DHCP: detailed packet contents
Apr 10 16:28:03.861 PDT: src FE80::5D5E:7EBD:CDBF:2519 (Vlan206)
Apr 10 16:28:03.861 PDT: dst FF02::1:2
Apr 10 16:28:03.861 PDT: type SOLICIT(1), xid 8277025
Apr 10 16:28:03.861 PDT: option ELAPSED-TIME(8), len 2
Apr 10 16:28:03.861 PDT: elapsed-time 101
Apr 10 16:28:03.861 PDT: option CLIENTID(1), len 14
Apr 10 16:28:03.861 PDT: 00010001195FD895F01FAF10689E
Apr 10 16:28:03.861 PDT: option IA-NA(3), len 12
Apr 10 16:28:03.861 PDT: IAID 0x0FF01FAF, T1 0, T2 0
Apr 10 16:28:03.861 PDT: option UNKNOWN(39), len 32
Apr 10 16:28:03.861 PDT: option VENDOR-CLASS(16), len 14
Apr 10 16:28:03.861 PDT: option ORO(6), len 8
Apr 10 16:28:03.861 PDT: DOMAIN-LIST,DNS-SERVERS,VENDOR-OPTS,UNKNOWN
Apr 10 16:28:03.861 PDT: IPv6 DHCP: Option IA-NA(3) is not supported yet
Apr 10 16:28:03.861 PDT: IPv6 DHCP: Sending ADVERTISE to FE80::5D5E:7EBD:CDBF:2519 on Vlan206
Apr 10 16:28:03.861 PDT: IPv6 DHCP: detailed packet contents
Apr 10 16:28:03.861 PDT: src FE80::21D:E6FF:FEE4:4400
Apr 10 16:28:03.861 PDT: dst FE80::5D5E:7EBD:CDBF:2519 (Vlan206)
Apr 10 16:28:03.861 PDT: type ADVERTISE(2), xid 8277025
Apr 10 16:28:03.861 PDT: option SERVERID(2), len 10
Apr 10 16:28:03.865 PDT: 00030001001DE6E44400
Apr 10 16:28:03.865 PDT: option CLIENTID(1), len 14
Apr 10 16:28:03.865 PDT: 00010001195FD895F01FAF10689E
Apr 10 16:28:03.865 PDT: option STATUS-CODE(13), len 15
Apr 10 16:28:03.865 PDT: status code NOADDRS-AVAIL(2)
Apr 10 16:28:03.865 PDT: status message: NOADDRS-AVAIL

Hello,
maybe hitting the following bug.
Pv6 Address Assignment Support for IPv6 DHCP Server
CSCse81385
Hope this helps

I have a BE6000 server, is it possible to me to make it do a DHCP for both voice and data? Kindly guide me through

I have a BE6000 server, is it possible for me to make it do a DHCP for both voice and data? Kindly guide me through. Thanks

CUCM can perform DHCP functions, but it's not meant to replace this functionality from a router or switch, which are the most common places to configure DHCP.
I assume you'll have at least one of those, why not configure it there??

Vlan tags for voice

Hi all, can anyone tell me why we untag the vlan for data, but tag for voice when using the same port, does the untagged vlan have to be the same between all trunk ports ?, and also if it is untagged, how does the next switch know what vlan the data has come from ?

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.
Liability Disclaimer
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
Yes, for egress. Ingress is "it depends".
You could also consider using both links for both kinds of traffic.

Port with multi-vlan for voice and data??

Hi guys,
I've a situation where my VOIP and DATA on a different segments. Voice is 10.x.x.x riding on VLAN 701. And my data is 192.x.x.x riding on VLAN 100.
The problem occur when our receptionist PC have a software installed for call forwarding for our general line. This software need to be on the same vlan with the IP Phone vlan which is 701. If I put her PC on those vlan, she can't access
to our LAN which is vlan 100. So she can't check her email etc.
Can I know what is the options I have? Can I configured multi-vlan for her PC on the switch? We are using Cisco PoE 3560 switch. Thanks.

Hi,
on the L3 switch, you should have an IP address for both VLAN 701 and 100. So, the L3 switch is doing inter-VLAN routing.
This means, unless you have ACL blocking traffic, any device will be able to reach any other device, even on a different VLAN.
And, no matter where you put voice and applications, everything will work anyway.

Vlan for voice and vlan for data with diferent ISP best choice of config??

Hello everyone,
Im, Oscar
At our company we have a redundant ISP connection to two separate ISP's.
We are also using VoIP on the network.
Currently one ISP connection is used primarily and the second on is just used as a backup.
I was wondering if it is possible to use the first connection primarily for data traffic and the second connection for VoIP traffic?
We use different VLAN's for voice and data.
Any help would be appreciated.

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.
Liability Disclaimer
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
Yes, for egress. Ingress is "it depends".
You could also consider using both links for both kinds of traffic.

DHCP for VLAN on 4507; IP Conflicts too often

I have seen a few similar posts, but nothing so far that fits my scenario, I think.
I keep getting random users in this VLAN reporting IP conflicts. These desktop systems are left on 24/7. Right now, we only have one VLAN DHCP being served from this core switch.
There are only 29 computers pulling DHCP on this VLAN, but I have a large range allocated to them for growth. These are desktop systems, so they don't swap network ports, and they don't have dual NICs, nor do they have WiFi. So I am at a lose as to why we would be seeing IP conflicts with such an obvious open pool of IPs, and with MAC addresses not changing. It has been my experience that pretty much unless something happens(offline for several days, NIC replacement, etc.) to the MAC every IP renewal gives the same IP back.
Core#sho ip dhcp pool OUR-Workstations
Pool OUR-Workstations :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 254
Leased addresses               : 28
Excluded addresses             : 49
Pending event                  : none
1 subnet is currently in the pool :
Current index        IP address range                    Leased/Excluded/Total
10.1.32.183          10.1.32.1        - 10.1.32.254       28    / 49    / 254
Core#sho ip dhcp binding
Bindings from all pools not associated with VRF:
IP address      Client-ID/              Lease expiration        Type       State      Interface
                Hardware address/
                User name
10.1.32.50      0180.1f02.5f5e.b6       Dec 18 2013 11:34 PM    Automatic Active     Vlan32
10.1.32.51      01f0.4da2.2e9f.06       Dec 19 2013 07:57 AM    Automatic Active     Vlan32
10.1.32.54      01b8.ac6f.45b4.27       Dec 19 2013 09:54 AM    Automatic Active     Vlan32
10.1.32.55      0100.2564.c8bd.ea       Dec 19 2013 09:33 AM    Automatic Active     Vlan32
10.1.32.58      01b8.ac6f.45c4.97       Dec 19 2013 04:18 AM    Automatic Active     Vlan32
10.1.32.61      01b8.ac6f.3693.05       Dec 19 2013 05:12 AM    Automatic Active     Vlan32
10.1.32.62      01b8.ac6f.35f0.eb       Dec 19 2013 05:18 AM    Automatic Active     Vlan32
10.1.32.63      0100.2564.c8c7.ae       Dec 19 2013 12:26 AM    Automatic Active     Vlan32
10.1.32.65      01f0.4da2.2fba.66       Dec 19 2013 01:44 AM    Automatic Active     Vlan32
10.1.32.66      01b8.ac6f.46eb.b8       Dec 19 2013 01:05 AM    Automatic Active     Vlan32
10.1.32.67      01b8.ac6f.45c9.7a       Dec 18 2013 10:54 PM    Automatic Active     Vlan32
10.1.32.68      01b8.ac6f.45c3.dc       Dec 19 2013 07:12 AM    Automatic Active     Vlan32
10.1.32.70      01b8.ac6f.35f1.48       Dec 19 2013 05:15 AM    Automatic Active     Vlan32
10.1.32.88      01b8.ac6f.37bc.3e       Dec 19 2013 06:37 AM    Automatic Active     Vlan32
10.1.32.97      01b8.ac6f.368f.f5       Dec 19 2013 06:42 AM    Automatic Active     Vlan32
10.1.32.101     01b8.ac6f.45bb.9e       Dec 19 2013 06:17 AM    Automatic Active     Vlan32
10.1.32.110     01f0.4da2.2d47.5a       Dec 19 2013 06:17 AM    Automatic Active     Vlan32
10.1.32.118     01f0.1faf.1d37.97       Dec 19 2013 07:19 AM    Automatic Active     Vlan32
10.1.32.121     0100.2564.c95a.c1       Dec 19 2013 06:53 AM    Automatic Active     Vlan32
10.1.32.144     01b8.ac6f.1d37.34       Dec 19 2013 09:16 AM    Automatic Active     Vlan32
10.1.32.167     0100.2564.c94e.f0       Dec 19 2013 07:34 AM    Automatic Active     Vlan32
10.1.32.170     01e0.db55.e9d7.01       Dec 19 2013 07:38 AM    Automatic Active     Vlan32
10.1.32.171     0100.03ff.2eba.66       Dec 18 2013 01:20 PM    Automatic Active     Vlan32
10.1.32.178     0124.7703.f1c2.e5       Dec 18 2013 10:02 AM    Automatic Selecting Vlan32
10.1.32.235     01f0.4da2.2c92.33       Dec 19 2013 09:53 AM    Automatic Active     Vlan32
10.1.32.238     01b8.ac6f.3649.aa       Dec 19 2013 05:21 AM    Automatic Active     Vlan32
10.1.32.241     01b8.ac6f.1d2a.2f       Dec 18 2013 10:08 PM    Automatic Active     Vlan32
10.1.32.247     01b8.ac6f.45b5.8f       Dec 19 2013 05:15 AM    Automatic Active     Vlan32
Not sure what the SELECTING status is for 10.1.32.178, but I assume I caught this at a point IP renewal.
Core#sho ip dhcp server stat
Memory usage         22449
Address pools        1
Database agents      0
Automatic bindings   28
Manual bindings      0
Expired bindings     1178
Malformed messages   294
Secure arp entries   0
Renew messages       2368
Relay bindings                 0
Relay bindings active          10
Relay bindings terminated      0
Relay bindings selecting       10
Message              Received
BOOTREQUEST          171602
DHCPDISCOVER         2931675
DHCPREQUEST          2680462
DHCPDECLINE          271
DHCPRELEASE          26
DHCPINFORM           951950
DHCPVENDOR           0
BOOTREPLY            0
DHCPOFFER            126
DHCPACK              0
DHCPNAK              0
Message              Sent
BOOTREPLY            0
DHCPOFFER            8196
DHCPACK              353198
DHCPNAK              12769
Message      Forwarded
BOOTREQUEST          0
DHCPDISCOVER         0
DHCPREQUEST          0
DHCPDECLINE          0
DHCPRELEASE          0
DHCPINFORM           0
DHCPVENDOR           0
BOOTREPLY            0
DHCPOFFER            0
DHCPACK              0
DHCPNAK              0

Hi,
Cisco IOS DHCP service doesn't reallocate the same IP to a client that is renewing its binding, it will try to offer the next IP available that is not excluded manually or that either didn't receive a DHCPDECLINE or a positive reply to an icmp echo test or ARP test.It will circle like this upto end of pool and starting at start of pool again.
Regards
Alain
Don't forget to rate helpful posts.

Separate vlan for Voice and Video

I'm implementing a Polycom HDX9002 video conf codec into my network (point to point). What is the prefered method, do I segregate the traffic with another VLAN or use the existing Voice VLAN at both sites.
Thanks
Paul

Voice vlan is fine. What really matters, is QoS in the WAN.

DHCP for Voice VLAN

Similar Messages

Maybe you are looking for