End-to-End EtherChannel problem with Cisco 7200 Routers
Posted on 2004-09-13
I have 2 x 7200VXR (both at different locations) connected to each other via a pair of 100Mb/s 'Lan Extension' ccts provided by COLT Telecom.
Int FA2/0 on router 1 is connected to Int FA2/0 on router 2. Similarly, INT FA2/1 on router 1 is connected to INT FA2/1 on router 2.
INT FA2/0 and FA2/1 on each router are combined into a FastEtherChannel (int portchannel 1), which works OK.
However, when I disconnect int FA2/0 on router 1 to take that interface out of the EtherChannel, INT FA2/0 on router 2 (on the other end of the LES cct) does
not leave it's own Etherchannel, causing connectivity between the 2 routers to stop.
I believe this is happening because the LES cct terminating equipment provides a local Ethernet link, so the remote end in this case (router 2), still believes that the cct is up.
What mechanism can I use to ensure an end-to-end keepalive, which will take the interface at the other end of a LES cct out of the EtherChannel if the local end goes down? Is PAgP an option on the 7200? - I am running IOS 12.3(1a)