STP BPDU trying to go out of disabled etherchannel member port

[cooperwalden]

In the above topology iosvl2-3 is the STP root bridge and it sends BPDUs out of G1/1 on the Po1 etherchannel group (LACP).  When I simulate an outage on g1/2 everything continues fine.  However, because the BPDUs are exiting out of Po1 member g1/1, if I take g1/1 down the other switches in the topology no longer receive BPDUs from the root bridge and elect a new root.

Likewise, continuous pings between desktop-0 and desktop-1 also go through g1/1 and those break when I disable g1/1.

Questions:

1. Other than configuring the port-channel between iosvl2-2 and iosvl2-3 as a layer3 port-channel (and bypass STP all together), is there a way for the root bridge to recognize that g1/1 is down and begin to send BPDU's out of the other port-channel member g1/2?

2. For the pings between the PCs, Is there a way for the port-channel to recognize that g1/1 is down and begin forwarding ping traffic out of g1/2?

Thanks!

[balaji.bandi]

You need to plan where the Root bridge to be - rather auto election process, this will have convergency time so the network will loose the connectivity.

https://www.ciscopress.com/articles/article.asp?p=2832407&seqNum=4

My suggestion you make 2-2 as root bridge with alternative option where you have dual links.

[cooperwalden]

duplicate post.

[MHM Cisco World]

I dont think g1/2 bundle to PO

Do show etherchannel summary 

MHM

[cooperwalden]

Here's the capture coming out of G1/1 before I shut it off. G1/2 only has LACP traffic on it.

[MHM Cisco World · Accepted solution]

That good' 

Now for test you remove cable from topolgy? If yes then I face same issue before' these emulate programs not support turn down port if link is deleted.

So to test link failed ypu need to shut the port.

MHM

[cooperwalden]

as long as I shutdown both sides of g1/1 it would fail over pings and stp bpdu, thanks!