I am trying to connect the new 6509E switch with 3750 using SFP module. 6509E is running 12.2(33)SXH and has a SUP720-3B and 3750 is running IOS 12.2(25)SEE2. We can't seem to establish the connectivity using port-channel or single port. Port is properly configured on both sides i.e. trunk encapsulation dot1q and switch mode trunk. What could be the problem? The switches are only 30 meters apart and we are running multimode 62.5/125 fiber between them. Is that too short and do we need to use the attenuator?
If you are seeing err-disabled, then you might have portfast enabled on your trunk along with bpduguard enabled. Try disabling bpdugaurd "no spanning-tree portfast bpdugaurd". Then clear your err-disabled state, "clear err-disable vlan". Then do a shut, no shut, on the interface.
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...