I have (2) links set up between a pair of 6500 chassis configured for GEC and dot1Q. If for whatever reason one of the fiber pairs goes errdisable, should the remaining link automatically revert to a single dot1Q trunked link?
This doesn't seem to be the case and am having to make the case for redundancy vs. load balancing.
It depends on the version of software you have, prior to 6.3 it would unbundle the link and revert to a single connection causing the port to go through the listening / learning / forwarding process. From 6.3 the link remains as part of a 1 port bundle thus avoiding the listening / learning / forwarding process.
An EtherChannel is preserved even if it contains only one port. In software releases prior to 6.3(1), if you have a 2-port channel and one link is removed, the remaining link is removed and added back to spanning tree, which causes a loss of connection on the channel until the link is forwarding again.
That being the case it looks like there are other issues that may be causing the link to stay down and not re-initiate. When one link goes down usually both links go down but never come back up. It requires a manual intervention. I'll have to look at the errdisable log next time it happens.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.