Vlan setting on i2002 phone 2

[njgpeck]

I'm trying to set QoS with Nortel i2002/i2004 phones and Cisco 2950 Standard Image routers. Do I need to use the VLAN setting in the phone config? Each time I turn it on I lose the connection with the phone and the swtich. The switch light doesn't even come on. Is the VLAN setting necessary for QoS? If not what is it for?

 

[biv343]

VLAN setting is used if you want the IP phone to operate on one VLAN, but have a PC plugged into the integrated switch on a separate VLAN. If you are not using that scenario, leave VLAN set to none.

You can use DSCP to prioritize your voice on the network, provided your equipment can recognize and prioritze based on DSCP. 802.1p is typically used in a layer 2/VLAN scenario.

 

[njgpeck]

Okay, I do have a PC connected to the phone and would like to keep them on seperate vlans. But as soon as I turn on the VLAN on the phone it drops the connection to the switch. I can't seem to get it to come back up.

So what vlan number do I set on the phone and do I need that same vlan set on the switch port?

Thanks for your help. I haven't been able to find anything on Nortel's site yet.

 

[biv343]

That is dependent on how your data switch is set up, and how your BCM is connected to the network.

Say VLAN-1 is your data, and VLAN-2 is for voice. VLAN-1 is 10.10.10.X/24, and VLAN-2 is 10.10.20.X/24. The BCM would live on the 10.10.20.X VLAN, while your regular data network is on the 10.10.10.X VLAN. In this instance, you will need a layer 3 device to route between the two VLANS.

Let's also say you have a single data 24 port data switch. Port 1 is an uplink to the router that does the routing between VLANS, and is a tagged trunk port, with VLAN memberships of VLAN1 and VLAN2. Ports 2-20 are VLAN-1, and port 21-24 are VLAN 2. The BCM connects to port 22, and sees VLAN 2 only.

The trick is to configure the other ports that the i2002 phones connect to as members of both VLANS. Make sure that VLAN-1 is the default VLAN for the ports. The phone, when set to Voice VLAN 2, will tag voice packets as VLAN 2, while data packets will be untagged and will revert to VLAN 1.

I hope this makes sense, and that I didn't get my facts messed up.

 

[njgpeck]

Okay, that all makes sense, but one more "dumb" question.

Do I have to have the VLANs on different Ip segments?
For example, right now data, BCM and all IP phones are on 10.10.10.X/24 segment. Do I need to seperate those with a different IP segment?

 

[njgpeck]

Actually, to be more correct, Ip phones are on 10.10.10.X, 10.10.20.X, 10.10.30.X and 10.10.40.X segments, each at different locations.

The phones work excellent, except between branches. When phones on 10.10.20.X call 10.10.30.X they can't hear each other. I'm hoping QoS will fix this issue.

We have Cisco 2950 switches and Cisco 2610 Routers at each location.

 

[biv343]

A VLAN is a separate subnet/LAN. If your BCM is 10.10.10.2, and your IP phones are 10.10.10.20-40, and they are on separate VLANS, they won't talk to each other. The BCM would have to be on the same VLAN as the phones.

When you say "they can't hear each other" do you mean there is no talk path, or it's so garbled they can't understand each other?

What is the connectivity between sites? VPN, frame relay, T-1, etc.

If you're having QOS issues between branches, VLANs at the host end won't make any difference. You'll have to configure QOS on the routers to resolve those issues. The type of link will determine the type of QOS that should be used. If it's a low speed link, you may need to get into fragementation/interleaving, DSQMS, etc.

 

[njgpeck]

When they call the other branches, the call connects, but all they hear is silence. When we (main site) call the branches or they call us it is totally clear.

We are running Point to point T1's to all of our branches.

I was told that if I setup QOS on the edges (switches at each branch) the routers would forward all of that information along. If there is a better/easier way, please, let me know!

 

[biv343]

So can site A (remote site) ping site B (another remote site)? If it's a hub and spoke setup, with point to point T-1's, it almost sounds like an IP networking problem versus a QOS problem (initially, anyway). What I think is happening is that site A places a call to site B - the BCM sees the call from A, points it via IP trunks to B, and alerts the phone at site B. The call connects, but A cannot talk to B directly, hence no talk path, and silence.

 

[3Sixty]

Have you got the system set up something like this

Site A Site B Site C

IP PHONES IP Phones IP Phones
Cisco 2610 Cisco 2610 Cisco 2610
\ | /
\ | /
\ Cisco 2610 /
\--------------------Site D----------------/
BCM

If this is your set up and all the phones can connect to the main site and talk to any of the handsets on the main site. Then the problem is with the routing on the routers I have had the same problems in a VPN scenario. The IP phones do not connect throught the BCM routing table when they go IP phone to IP phone they create a connection between the phone s and you probably have some problems with your routing tables. I would start with what Biv said can you ping each of the remote sites from each other not just the main site

Marshall

http://www.marshallshouse.co.uk

 

[njgpeck]

AH!! So the phones send the conversation directly to each other! For some reason I figured it all went through the BCM (don't know why). You guys are both right on the money. I have ACLs on each router that block the branches from talking to each other, except for a few needed holes. I will jump in and create some exceptions for our phones.

Thanks for your help biv343 and mrmarshal. You saved me a lot of time and headache.

If at first you don't succeed....then sky diving isn't for you.

 

[njgpeck]

Yep, that fiexed the problem. Thanks guys for your help!

If at first you don't succeed....then sky diving isn't for you.