IP Phone not working on 3550 XL Switch

Answered Question
Jul 2nd, 2009

Hi Guys,

We have a 3560 Switch as a core Switch, and I connected a 3550XL Switch to the core Switch. On our 3560 Core Switch we have lots of server including a CallManager server. Everything is working fine except when I will connect an IP Phone on the 3550 Switch, it can't see our Call Manager server.

Hope you can help guys. Thanks.

I have this problem too.
0 votes
Correct Answer by chinkevi_2 about 7 years 5 months ago

for the old XL series, you must configure trunk to ipphone, and then do voice vlan. I do not think trunk negotiation is supported.

you can confirm when you do "sh int fax/y switchport" and look for voice vlan.

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Overall Rating: 5 (2 ratings)
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dario.didio Fri, 07/03/2009 - 00:09

Hi,

some questions:

- how is the port where the telephone is connected to configured?

- is the voice VLAN available on your switch?

- is the connection between both switches up and allowing the voice vlan to pass?

- is DHCP working correctly? Does the phone receives a address in the correct VLAN? Does he get the IP Address of the TFTP server for his config?

BR,

Dario

helios999 Fri, 07/03/2009 - 18:20

Hello,

Thanks for the reply, here are the details.

- the port used by the IP Phone is configured to access vlan10 and voice vlan3

- the voice vlan is available on the switch

- im sure the connection between switches allow voice vlan to pass because I test my laptop on one of the ports and I can successfully connect to our vlan10. So basically all vlan's can pass to the switch.

- our IP Phones are configured a static ip address. It has a configured IP that belongs to the voice vlan. And I have also configured the TFTP server on the Ip Phone.

And one thing I forgot to mention, this IP Phone that I used for testing is already working on other switches except on the 3550XL switch that I added recently to our network.

Hope you reply soon Darion. Thanks.

pompeychimes Fri, 07/03/2009 - 18:30

I have lots of questions. Most could be answered by posting the 3550 config.

Leo Laohoo Fri, 07/03/2009 - 18:57

I'm not being a nit-pick or something but you either have a WS-C3550 or WS-C3500-XL-EN. There is no such thing as a WS-C3550-XL-EN.

helios999 Sun, 07/05/2009 - 19:14

Hi Guys,

Thanks for all your replies. The label on the switch reads as: Catalyst 3500 Series XL.

I posted here the config of our Cisco 3560 Core Switch and Cisco 3550 Switch.

Please note that our DHCP Server are only for pc's, we give static IP's to all our IP Phones.

Hope you help me guys, thanks.

Correct Answer
chinkevi_2 Sun, 07/05/2009 - 22:37

for the old XL series, you must configure trunk to ipphone, and then do voice vlan. I do not think trunk negotiation is supported.

you can confirm when you do "sh int fax/y switchport" and look for voice vlan.

helios999 Mon, 07/06/2009 - 01:01

Hi Chinkevi,

Your suggestion works I'm very thankful, but before I will rate your help I have one more concern. Our setup is to carry Voice and Data traffic on the same port, so if we will configure trunk on the port Data traffic will not pass. Do you have a work around for this?

This is an excerpt on the config:

interface FastEthernet0/14

switchport access vlan 10

switchport trunk encapsulation dot1q

switchport mode trunk

switchport voice vlan 3

Hope you can help again on this. Thanks.

helios999 Mon, 07/06/2009 - 16:52

Hi Chinkevi,

I will just make another post for this problem. And since you help me solve my question with IP Phones and 3550 I will rate your answer accordingly. Thanks.

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