trunks between 2950s stop working and wont come back
I've seen this happen on 2 different 'pairs' of 2950s, so it's time to investigate. The scenareo:
simple trunk (no vlan definitions) between 2 2950s. 1 switch looses power, when power is restored, the switch that didn't lose power doesn't pass any traffic. The interface is up (link and administrativly up) the logs don't show anything other than the interface went down and came back up. here's a sample port:
description new Feed from phone room switch
switchport mode trunk
no ip address
I'm not using spanning-tree, there aren't any redunant paths. Its worked fine for months (until a ups failure), I set up a new port on the switch and swing the cable and it comes up. Any ideas?
Re: trunks between 2950s stop working and wont come back
I know this is an old post... but I am posting here in case this is viewed by anyone with a possible solution.
Our organization has multiple locations configured the same way:
(x2) cross connected 2950 switches in trunk mode, configured the follwing way per each interface (fa0/19):
! interface FastEthernet0/19 no ip address duplex full speed 100 no cdp enable spanning-tree portfast !
Our problem is similar to the one explained in this initial post. The switches are auto-trunked via port #19.
Let's call one switch "A" and one switch "B"
Whenever power is removed from one of the switches (Switch A), and it has completed a restart, the opposite switch (Switch B ..the one which was not powered off) will not return to a "Trunked" state. When you run the "show int status" command, it shows that the port is "connected". Even though the switch which was initially restarted returns to "Trunked" mode.
We have seen this with a few of our 2950's across the infrastructure.
The bottom line is that restarting one of the switches causes the other to lose the trunked state. The only was to correct the issue is to restart the opposite switch as well.
The IOS version is 12.1 (9) EA1d .. I know it's old, however we cannot upgrade it at this time due to policies within the organization.
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