Cisco IP Phones 7900 Series

thalabi — Tue, 18 Aug 2020 04:05:29 GMT

Hello Heroes 🙂

we have a switch X450-G2-24p that need to be use in one of remote sites which has already Cisco IP Phones (8800) and (9712,9740) deployed in their network, so we have configured the switch and apply the needed commands especially for the IP Phones, the 8800 it works fine with no issues, but 9712 and 9740, it shows the following:
- the port is getting up but showing nothing on the screen .
- the port speed is 10M instead of 100M as this phones is supported only 10/100...
so we had some troublshooting as the following:
- Enable/Configure CDP instead of LLDP (which LLDP is working properly on 8800)
- Assign Port speed manually (100M) instead of auto .…

anyways here is the configuration of what i had done as the following:

#
# Module vlan configuration.
#

create vlan "VOICE"
configure vlan VOICE description "Voice"
configure vlan VOICE tag 11
create vlan "DATA"
configure vlan DATA tag 10
create vlan "ADMINS"
configure vlan ADMINS tag 55
configure ports 25 auto off speed 10000 duplex full
configure ports 26 auto off speed 10000 duplex full
configure ports 27 auto off speed 10000 duplex full
configure ports 28 auto off speed 10000 duplex full
configure vlan Default add ports 25 tagged
configure vlan Default add ports 8,19,21-22,26 untagged
configure vlan VOICE add ports 1-26 tagged
configure vlan DATA add ports 25 tagged
configure vlan DATA add ports 1-7,9-18,20,23-24 untagged
configure vlan ADMINS add ports 25 tagged
configure vlan Default ipaddress 10.0.0.5 255.255.255.128
enable ipforwarding vlan Default
configure vlan Mgmt ipaddress 1.2.3.4 255.255.255.0
configure vlan ADMINS ipaddress 10.1.1.5 255.255.255.0
enable ipforwarding vlan ADMINS

#
# Module lldp configuration.
#

enable lldp ports all

configure lldp port all advertise vendor-specific dot3 mac-phy
configure lldp port all advertise vendor-specific med capabilities
configure lldp port all advertise vendor-specific med policy application voice vlan VOICE dscp 40

after that, since lldp doesn’t work on 7900 series, i had applied the following:

disable lldp ports 17,18

#
# Module edp configuration.
#
enable cdp ports 17
configure cdp power-available advertise port 17
enable cdp ports 18
configure cdp power-available advertise port 18

the problem still same, then i did the following in order to force the interface to get the speed as a 100M:

configure ports 17 auto off speed 100 duplex full
configure ports 18 auto off speed 100 duplex full

the ports didn’t get up at all …. !

so any ideas to solve this problem (some missing CLIs has to be applied, hot-fixes, patches ,etc ....)?

Thanks in Advance!

Re: Cisco IP Phones 7900 Series

PeterK — Sat, 22 Aug 2020 16:38:48 GMT

I can’t give you a answer to definitely solve your problem, but a few facts to think about.

AFAIK EXOS 16.x/21.x/22.x don’t support CDPv2. When I’m right the support for that was released in one of the 30.x releases. But I’m not 100% sure. So, I could check your EXOS Version.

Maybe the phones require CDPv2. But I also don’t know if you need to enable or configure cdpv2 separately on the switch.

Re: Cisco IP Phones 7900 Series

thalabi — Sun, 23 Aug 2020 02:44:09 GMT

Thank you Peter:

well, the problem had been solved partialy, actually the legacy inline-power ( 802.3af ) has to be enable as per the acticle below:

https://gtacknowledge.extremenetworks.com/pkb_mobile#/articles/en_US/Solution/X440-48p-is-not-powering-up-Cisco-7940-or-Cisco-7910-IP-phones

The IP Phone had powered up ,but still is not able to reach to the communication server ….

topic Re: Cisco IP Phones 7900 Series in ExtremeSwitching (EXOS/Switch Engine)

Cisco IP Phones 7900 Series

Re: Cisco IP Phones 7900 Series

Re: Cisco IP Phones 7900 Series