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New Member

2800 with NDM-36-ESW Vlan problem

I am setting up the above for Avaya phones. The sites with separate router/switch combos work fine.

The FA port settings are as follows:

!

interface FastEthernet1/2

description * Data/Voice Vlan's *

switchport access vlan 20

switchport voice vlan 852

mls qos trust dscp

spanning-tree portfast

We have 2 Vlan interfaces set up - 1 for voice and one for data. (20 is data and 852 is voice.

If I plug a laptop in, I get an IP address from the off-site DHCP server.

If I plug the phone in, it get the Vlan number (852) from the scope option properly.

If I change the port to

switchmode access vlan 852

and plug the laptop in, I get a voice IP address.

If I plug the phone in, it gets it's voive IP address and loads it's config. But I can't get a data IP for the PC.

I do a show vlan-sw and see that all of the ports are assigned to Vlan 20 but none are co-assigned to Vlan 852.

The 3550's, 3750's, etc. at other sites have both Vlan's assigned to each port.

What am I missing?

Thanks,

Tom

But on this setup, when I do a sho vlan-sw,

4 REPLIES

Re: 2800 with NDM-36-ESW Vlan problem

Try a config such as the following:

interface FastEthernet1/2

description * Data/Voice Vlan's *

switchport trunk encapsulation dot1q

switchport mode trunk

switchport trunk native vlan 20

switchport voice vlan 852

mls qos trust dscp

spanning-tree portfast

Hope this helps. If so, please rate the post.

Brandon

New Member

Re: 2800 with NDM-36-ESW Vlan problem

Thanks.

I loaded this config this morning remotely. I still do not see the interface in the vlan table. It is now in VLAN 1

VLAN Name Status Ports

---- -------------------------------- --------- -------------------------------

1 default active Fa1/2

20 VLAN_20 active Fa1/1, Fa1/3, Fa1/4, Fa1/5, Fa1/6, Fa1/7, Fa1/8, Fa1/9, Fa1/10

Fa1/11, Fa1/12, Fa1/13, Fa1/14, Fa1/15, Fa1/16, Fa1/18, Fa1/19

Fa1/20, Fa1/21, Fa1/22, Fa1/23, Fa1/24, Fa1/25, Fa1/26, Fa1/27

Fa1/28, Fa1/29, Fa1/30, Fa1/31, Fa1/32, Fa1/33, Fa1/34, Fa1/35

852 VLAN_852 active Fa1/0

Doing a show int fa 1/2 trunk gives me this:

Port Mode Encapsulation Status Native vlan

Fa1/2 on 802.1q not-trunking 20

Port Vlans allowed on trunk

Fa1/2 none

Port Vlans allowed and active in management domain

Fa1/2 none

Port Vlans in spanning tree forwarding state and not pruned

Fa1/2 none

The site is an hour or so away. I am heading over ther now to see if the phone works in spite of not seeing the voice vlan on the interface.

Any ideas on why this is?

Thanks,

Tom

New Member

Re: 2800 with NDM-36-ESW Vlan problem

All is working .. Thanks. Still not sure why it shows in Vlan 1 though.

New Member

Re: 2800 with NDM-36-ESW Vlan problem

When you use the command "switchportmode access vlan 852", you basically assign that port to have access to vlan 852 ONLY - that's why you get the voice's ip address when you plugged your laptop in this port.

You should use this config:

switchport mode access

switchport access vlan 20

switchport voice vlan 852

hth,

hieu

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