I did have a setup as you suggested but it didn't work.
The phones are working now. Turns out I had to turn LLDP off completely for the phone ports and ISDP works a treat.
Turns our what was happenning was:
1. The phone would get its initial config via ISDP and boot correctly on the voice vlan
2. The switch would advertise LLDP MED, the phone would update it's settings incorrectly (not get the VLAN info from the LLDP MED packet) and restart and VLAN 1 - hence the change in IP address
I have 3 phones successfully working of the switch now.
I done some more traces concentrating on the ISDP (CPD) and LLDP packets. I can see the switch sending the LLDP multicast packets including the network policy. In the network policy I can the VLAN settings
When the phone sends its LLDP multicasts, I can also see the network policy and the PDU shows the network polciy is unknown. So it looks like the phone it not getting the LLDP MED policy from the switch.
Is there a compatibility issue perhaps between the LLDP MED on the switch and on the phone? Is there something else I need to do so the phone gets the policy
I provided this same answer in the Dell Techcenter Post that you provided on the same subject.
It looks like it may be an incompatibility with the phone and the switch. I did a search for LLDP thru this Polycom 450 IP phone User Guide and it has no mention of the feature.
al7009
5 Posts
1
October 22nd, 2012 17:00
I did have a setup as you suggested but it didn't work.
The phones are working now. Turns out I had to turn LLDP off completely for the phone ports and ISDP works a treat.
Turns our what was happenning was:
1. The phone would get its initial config via ISDP and boot correctly on the voice vlan
2. The switch would advertise LLDP MED, the phone would update it's settings incorrectly (not get the VLAN info from the LLDP MED packet) and restart and VLAN 1 - hence the change in IP address
I have 3 phones successfully working of the switch now.
Happy Days :)
Cheers
Al.
al7009
5 Posts
0
October 21st, 2012 19:00
I done some more traces concentrating on the ISDP (CPD) and LLDP packets. I can see the switch sending the LLDP multicast packets including the network policy. In the network policy I can the VLAN settings
When the phone sends its LLDP multicasts, I can also see the network policy and the PDU shows the network polciy is unknown. So it looks like the phone it not getting the LLDP MED policy from the switch.
Is there a compatibility issue perhaps between the LLDP MED on the switch and on the phone? Is there something else I need to do so the phone gets the policy
DELL-Willy M
802 Posts
1
October 22nd, 2012 11:00
I provided this same answer in the Dell Techcenter Post that you provided on the same subject.
It looks like it may be an incompatibility with the phone and the switch. I did a search for LLDP thru this Polycom 450 IP phone User Guide and it has no mention of the feature.
www.telecomuserguides.com/.../SoundPoint-IP-450-User-Guide-for-SIP.pdf
You might give this example a try on the switch or use your example and leave the LLDP options out.
console#configure
console(config)#vlan database
console(config-vlan)#vlan 25
console(config-vlan)#exit
console(config)#voice vlan
console(config)#interface gi1/0/10
console(config-if-Gi1/0/10)#switchport mode general
console(config-if-Gi1/0/10)#voice vlan 25
Hope this helps,
Keep us updated if you can.
showk
2 Posts
0
May 15th, 2018 07:00
Hello,
May i know how to enable ISDP for voice ports?
I too having similar issue now.
Thank you!