can anybody help with a clue, when i am connecting Catalyst C2950-24 on to the network the network goes down that is casscading with Nortel/3com switch. Where as if i connect directl to a Catalyst 3550 it works
By default, those 2950 interfaces are set to dynamic desirable. So once there is link-up, it will send out DTP (aka D-ISL) frame to negotiate ISL trunk. The Nortel will not understand and flood out the entire vlan. If there are other Cisco switches connected to the Nortel, the trunk may bounce. It works ok with 3550 since the 3550 interfaces behave the same way. I suggest to configure switchport mode access under the interface and connect it to Nortel again. Hope this helps.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...