Hi there. We have 3 Nortel RG 9150 remote PBXs installed at a branch location, and they have been functioning well for years plugged into 3Com 4500 10/100 switches. These switches have a very basic configuration; nothing special. We are transitioning over to Cisco 2960 switches with very basic configurations. The problem is that when we plug the 9150 into the 2960 switch, the RX light flashes like it should, but the TX light only flickers intermittently. We cannot ping it from the switch or local router. Everything in this building is in VLAN 1. I've tried turning on full duplex on the 9150 and/or hard-setting the speed/duplex on the 2960 switch. The company that maintains our 9150 sent a guy out who was completely puzzled by this too. In some ways this seems too basic to be a problem, but it is.
The twist on this problem is that the 3Com switch, which the 9150s are plugged into, is connected directly into the Cisco 2960 that I can't make them work on. Plug them into the 3Com, they work; move them upstream to the Cisco, and they stop, even after I reboot them.
Here are the port configs of the 3Com and Cisco switches.
Cisco
interface FastEthernet0/15
switchport mode access
power inline never
speed 10
duplex full
spanning-tree portfast
interface GigabitEthernet0/1
description \\ Link to 3Com switch //
switchport mode access
3Com
interface Ethernet1/0/4
stp edged-port enable
broadcast-suppression pps 3000
packet-filter inbound link-group 4999 rule 0
interface GigabitEthernet1/0/50
description \\ Link to Cisco switch //
Any ideas?
