Cisco LAN & Avaya IP phones

[venancio.martinez]

We have an environment where the LAN is Cisco (Catalyst 3550), the dhcp server is configured in the same switches, and the IP phones are Avaya. The phones must be in vlan 2, and data in vlan 1. We have problems between the Avaya IP phones and the dhcp servers: sometimes the phones are in vlan 1.

Here you have the dhcp server configuration:

ip dhcp pool DATOS

network 10.105.8.0 255.255.254.0

dns-server 10.105.8.28 10.105.8.29 10.101.1.80 10.101.1.81

default-router 10.105.8.1

option 176 ascii "MCIPADD=10.105.108.24,MCPORT=1719,TFTPSRVR=10.105.8.31,L2Q=1,L2QVLAN=2"

!

ip dhcp pool VOZ

network 10.105.108.0 255.255.254.0

default-router 10.105.108.1

option 176 ascii "MCIPADD=10.105.108.24,MCPORT=1719,TFTPSRVR=10.105.8.31,L2Q=1,L2QVLAN=2"

TIA

[#2]

This might help you:

http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/29_35wc/sc/swgvlans.htm#xtocid1196638

[mlambe]

Possilby remove the L2QVLAN statement from the 176 option in the phone vlan. I assume you have trunk links to each desk. Ensure that the native vlan is the data vlan, and test the trunk port by assigning a PC with addresses statically in each vlan and test you can contact eveywhere. I use the same sort of config but have an M$ DHCP server (has to be 2000) and mine works very well.

[venancio.martinez]

We have a dot1q trunk in each port. We need in vlan 1 a dhcp server because our PC's need it. Why do you think that the L2QVLAN statement from the 176 option can cause problems in vlan 2 (voice vlan)?

TIA

[mlambe]

Well why would you want to tell a device in that subnet to get an address from the same subnet it is already in? Have you tried it?