Changing SFP in Port-channel Causes route to go down

[jwils0320]

I have 2 4506's A and B with 2 point to point connections back to a 6509 VSS.

4506A has 1 connection the 6509A and 1 to 6509B (which shouldn't matter because VSS treats it as 1 switch)

and 4506B is setup the same way.

We are using eigrp throughout the network. 

I had an sfp go bad on 4506A but the route did not go down because of the port channel configured on port Te1/1 and 1/2. 

Te1/1 is the sfp that went bad. When I replace it with a working SFP I lose connection to 4506A and I can see in the logs that I lose the eigrp neighbor relationship to that switch.

I thought that since there is a port-channel configured that replacing this interface should not effect traffic in any way. Just wondering if anyone has experienced this before or if this is the expected behavior? 

Let me add that this is a layer 3 port-channel. Does the mac address change when adding additional interfaces to a layer 3 port-channel?

[Reza Sharifi]

Since this is a layer-3 Portchannel,  The only thing you may lose is the peering for a very short time, because if the peering is going over te1/1 and when you shut it down to replace the SFP, there maybe a very short time until te1/2 takes over traffic forwarding.

HTH