Aastra phones with separate vlan getting ip from the data vlan catalyst 4507

[phoneguy610]

Can't figure this out we know its the switch because we plug the phones straight into the router and they work no problem. Basically about half of the phones come up in the right vlan the other half don't.

Tried everything we can think of including lldp.

Anyone run into this?

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[whykap]

If I had to guess the switch ports are not configured properly on the non working ports?

 

[phoneguy610]

We went over the configs and all ports are configured the same. It seems completely sporadic

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[whykap]

What happens to the ones that don't? What stage are they stuck on?
Do you have enough ip addresses in your dhcp scope?
Keep in mind I don't know a thing about Astra phones[tt][/tt]

 

[phoneguy610]

Phones are easy and there are plenty of ip addresses available , the router is adsigning dhcp and when I plug phones directly into the router they come up no problem.

The ones that have problems get an IP address in the data vlan,
There is another device assigning dhcp for the data vlan only. I have never seem phones that are tagged for one vlan grab an ip from another. IMO there is a problem with the routing in the switch

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[ADB100]

How are the phones discovering the Voice VLAN? Some Aastra IP phones support LLDP, some don't (the Ericsson ones). All generally support DHCP vendor options but this requires the 'double DHCP' boot. The voice VLAN tag could also be coming from a configuration file downloaded by the phone on booting.

I suggest you get a sniffer on (wireshark?) and mirror a port whilst a phone attempts to boot. Make sure your PC is configured to display the 802.1q tags (most Windows NIC drivers strip the 802.1q tags off and need registry tweak).

Andy

 

[phoneguy610]

The phones are hardcoded to the voice vlan, and we tried lldp

The it vendor ran a wireshark trace but couldn't find the voice traffic

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[VinceWhirlwind]

I'd say your VLANs are bridged and you have two DHCP servers serving out two different ranges on what is effectively a single broadcast segment.

 

[phoneguy610]

Any ideas what they may have done wrong ?

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[phoneguy610]

They tried these two configs:


interface GigabitEthernet1/9
switchport access vlan 100
switchport mode access
switchport voice vlan 10
spanning-tree portfast

interface GigabitEthernet6/4
switchport trunk native vlan 100
switchport trunk allowed vlan 10,100
switchport mode trunk
spanning-tree portfast


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[VinceWhirlwind]

For a phone that supports CDP, the first one is the right one.

For phones that don't support CDP, you could use either, both work the same.

 

[phoneguy610]

Neither have worked at this point ,it's about 50/50

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[phoneguy610]

So just to keep you guys posted cisco is reviewing a wireshark trace right now... They are stumped it appears as well

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[VinceWhirlwind]

What's the config of the DHCP server's switchport?

 

[phoneguy610]

It's not the dhcp server we eliminated that by setting up another switch in our lab

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