I have found already in two situations really problems when are configured connections between two Switches in Channel on fiber Gbic (trunk) and redundant Channel on copper FastEthernet(ever on trunk) from both Catalyst 6000 or 5000.
The connection became unstable and it seems that STP doesn't work in order.
In fact seems that the links on copper doesn't go in blocking but go in forwarding also it isn't configure with best priority naturally.
You should be able to channel and trunk over it fine without any STP issues. But make sure you configure channel first and then trunk over it. Also if it is between 2 CATOS switches, use desirable as the channel and trunk mode. Also enable UDLD to see if there is any unidirectional links
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...