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1855 Views 12 Replies Latest reply: Sep 11, 2012 11:35 PM by Anders Jul Jensen RSS

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Cisco Voice-VLAN

Sep 7, 2012 8:43 PM

Chad Spears CCNP CCDA CCNAS 751 posts since
Jul 27, 2009

Hello All-


Doing some remote work tonight and running into a strange issue, just wanted to see if anyone has seen this before or have any other insight.


I have the following:


Catalyst 2960

Vlan 1= Data

Vlan 2= Voice


Interface fa0/2 connects to a router that provides DHCP services and acts as a default gateway for the Voice vlan (VLAN 2).


interface FastEthernet0/2

switchport access vlan 2

switchport mode access

spanning-tree portfast



Interface fa0/22 connects to a router that provides DHCP services and acts as a default gateway for the data vlan (VLAN 1).



interface FastEthernet0/22

switchport mode access

spanning-tree portfast



Issue I am having is the phones that I have connected to acces ports on the same switch are not pulling IP addresses from the voice vlan (VLAN 2).  If I assign the port directly for vlan 2 via the switchport access vlan command it will get the correct ip address.  Using the switchport voice vlan 2 command is where I am having the issue.


Please let me know if you have any questions or thoughts.  below is more information.


PPA-B-SW1#show cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,

                  D - Remote, C - CVTA, M - Two-port Mac Relay


Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

PPA-WLC-1        Fas 0/1           166               H    AIR-WLC21 Fastethernet0/0/1

PPA-B-SW2        Gig 0/2           177              S I   WS-C2960- Gig 0/1

SIPA8B1D41EDD15  Fas 0/23          135              H P   IP Phone  Port 1

PPA-2-SW1        Gig 0/1           169              S I   WS-C2960- Gig 0/1




PPA-B-SW1#show cdp neig fa0/23 detail


Device ID: SIPA8B1D41EDD15

Entry address(es):

  IP address:

Platform: Cisco IP Phone 7960,  Capabilities: Host Phone

Interface: FastEthernet0/23,  Port ID (outgoing port): Port 1

Holdtime : 168 sec


Version :



advertisement version: 2

Duplex: full

Power drawn: 6.300 Watts

Management address(es):





PPA-B-SW1#show ru int fa0/23

Building configuration...


Current configuration : 157 bytes


interface FastEthernet0/23

switchport mode access

switchport voice vlan 2

mls qos trust cos

spanning-tree portfast





Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:


Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms



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