Re: L2 etherchannel interface tracking and shutdown

I can't tell you if it's possible to do any kind of MAC reachability,
as far as I can think of not.
You could create a separate VLAN for this and send it over the trunk
(assuming the port-channel is a trunk) and create IP SLA objects for
this that ping the other end. As soon the other end is not reachable,
the IP SLA fires a log message and based on that log message you could
fire an EEM script, shutting down the port-channel for instance.

I know it's a crappy solution, but it should work though :-)

-- 
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
On 4 sep 2009, at 15:18, Radioactive Frog wrote:
> oh I forgot to tell ya, link state tracking is not an option since  
> there
> will be waste of bandwidth.
>
>
> On Fri, Sep 4, 2009 at 11:10 PM, Radioactive Frog  
> <pbhatkoti_at_gmail.com>wrote:
>
>> 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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