Re: L2 etherchannel interface tracking and shutdown

Thanks Rick
humm...... IP SLA = Layer3
i want layer2

On Sat, Sep 5, 2009 at 2:59 AM, Rick Mur <rmur_at_ipexpert.com> wrote:

> 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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Received on Sat Sep 05 2009 - 03:59:10 ART