No Layer 3 Connectivity Between Nortel Avaya 1220 & HP 7510 Switch
Hi. Please can you help ?
We noticed when we upgraded our CISCO switch to an HP 7510 that some, and only some, of our Nortel Avaya 1220 phones stopped working. All VoIP switchport interfaces are configured identically. This is very strange, I know.
OK, so I'll explain by example. I have a 1220 phone, as does my colleague. My phone now boots but does not work. Like the other affected phones, it first shows a problem when you connect it and it tries to obtain DHCP details - it can't as it can't contact the DHCP server. So I've done some detective work and I can eliminate some possibilities and narrow it down. The problem affects only *certain* 1220 phones, even though they're all identical in their configuration and they all connect to identically configured switchport interfaces.
Also, believe it or not, it's not actually a DHCP problem at all. That is to say, though it fails to connect to the DHCP server, in fact the problem runs deeper than that. Here's how I know. I decided to test only layer 3 IP connectivity between my phone and the switch, setting aside other potential problems. So, I disable DHCP on the phone and give it a static IP address, subnet mask and gateway. I connect the phone to a totally standard switchport interface. Please be aware that I know this won't allow the phone to make and receive calls - remember, I'm only testing IP connectivity at this point. When I connect and boot the phone I cannot ping its IP address. Just to be sure there isn't something funny going on here, I also take my colleague's working phone, disable DHCP and configure it with the same settings. I disconnect my phone from the switchport and connect this phone instead and, boom, it can be pinged!
This means that my phone, and the other affected phones, have no IP connectivity to the new HP switch. They do show a link light and the switch does see them and even displays their LLDP neighbour information on the switchport interface. But, again, no IP connectivity. The problem isn't specific to, say, some switchports either. I can take a working phone, plug it straight into my phone's switchport and it will work. I can take my phone, plug it into a switchport assigned to a non-functional (affected) phone and it won't work. If a phone doesn't work it won't work on any HP switchport.
Now comes the really strange part. If I take my phone and plug it into a CISCO switch similar to the one we swapped out for a newer HP one, the phone works. Plug it back into the HP switch and it stops working.
So, specifically, layer 3 IP connectivity does not work between *certain* 1220 phones and our HP 7510 switch. Again switchport configurations are identical between affected and unaffected phones and we are not using port security! It's very strange.
Please can someone tell me what might be happening here and advise me how I might correct the problem? We are getting no real support from our vendor so are kinda on our own with this. Your help would be massively appreciated.
We noticed when we upgraded our CISCO switch to an HP 7510 that some, and only some, of our Nortel Avaya 1220 phones stopped working. All VoIP switchport interfaces are configured identically. This is very strange, I know.
OK, so I'll explain by example. I have a 1220 phone, as does my colleague. My phone now boots but does not work. Like the other affected phones, it first shows a problem when you connect it and it tries to obtain DHCP details - it can't as it can't contact the DHCP server. So I've done some detective work and I can eliminate some possibilities and narrow it down. The problem affects only *certain* 1220 phones, even though they're all identical in their configuration and they all connect to identically configured switchport interfaces.
Also, believe it or not, it's not actually a DHCP problem at all. That is to say, though it fails to connect to the DHCP server, in fact the problem runs deeper than that. Here's how I know. I decided to test only layer 3 IP connectivity between my phone and the switch, setting aside other potential problems. So, I disable DHCP on the phone and give it a static IP address, subnet mask and gateway. I connect the phone to a totally standard switchport interface. Please be aware that I know this won't allow the phone to make and receive calls - remember, I'm only testing IP connectivity at this point. When I connect and boot the phone I cannot ping its IP address. Just to be sure there isn't something funny going on here, I also take my colleague's working phone, disable DHCP and configure it with the same settings. I disconnect my phone from the switchport and connect this phone instead and, boom, it can be pinged!
This means that my phone, and the other affected phones, have no IP connectivity to the new HP switch. They do show a link light and the switch does see them and even displays their LLDP neighbour information on the switchport interface. But, again, no IP connectivity. The problem isn't specific to, say, some switchports either. I can take a working phone, plug it straight into my phone's switchport and it will work. I can take my phone, plug it into a switchport assigned to a non-functional (affected) phone and it won't work. If a phone doesn't work it won't work on any HP switchport.
Now comes the really strange part. If I take my phone and plug it into a CISCO switch similar to the one we swapped out for a newer HP one, the phone works. Plug it back into the HP switch and it stops working.
So, specifically, layer 3 IP connectivity does not work between *certain* 1220 phones and our HP 7510 switch. Again switchport configurations are identical between affected and unaffected phones and we are not using port security! It's very strange.
Please can someone tell me what might be happening here and advise me how I might correct the problem? We are getting no real support from our vendor so are kinda on our own with this. Your help would be massively appreciated.
.
Comment