L2 etherchannel interface tracking and shutdown

Gang,
I have a scenario below - real life exp.

sw1====ether-channel===SWX-DUMB-L2===========sw2
Cisco Dumb-no brand Cisco

Connections:
sw1-port1: mac - aa-aa-aa-aa --- goes to --sw2-port1:mac - cc-cc-cc-cc
sw1-port2:mac - bb-bb-bb-bb --- goes to --sw2-port2:mac - dd-dd-dd-dd

background:-
Both are connected using L2 ether-channels. My port channel is up and
running between sw1 and sw2 (yes having swX in middle, it works). Everything
working fine. Dumb switch doesn't support anything e.g. UDLD.

Problem: when i disconnect port 2 of sw1, it doesn't gets disconnected
(error-state) at sw2. Of course the reason being a Dumb switch in middle.
Now many of you'd think it doesn't work but its working and I have a few
field application running in the same scenario in production.

Problam: When I disconnect a cable from port#1 - traffic flow through the
other port e.g. port#2, no problem. but when I unplug cable from port#2 it
times out and i can see port-channel is still up. of course its the UDLD
which suppose to shutdown the port to other end to make it work but dumb sw
doesn't support UDLD.

Now my real qustion is:
Is it possible to configure IPSLA type of things based on MAC/Layer2 ping
based to track far end MAC and if its not reacheable via that interface it
shut it down.
I can do this using TCL script and EEM on Layer3 port-channeling (IP layer)
but don't know how to do it on MAC layer.
so, the situation is if port#2 is down on Sw1 , sw2 shud ping mac
cc-cc-cc-cc via its port#2 and if it pings do nothing else shutdown the self
port.

Kind of layer2 SLA on etherchannel

Thankx in advance.

frog

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Received on Fri Sep 04 2009 - 23:10:12 ART