Re: Etherchannel Issue

I will qualify my statements with the fact that it may vary depending upon
if your portchannels are L2 or L3 depending upon the platform,

I've deployed many 4500, 6500 and 37xx series platforms with L3 port
channels using the non-matched channel-group numbers method.

It makes it a lot easier when trying to troubleshoot a large environment if
the channel-group numbers make sense like a link between First floor SW1 to
Second Floor SW1 to use 12 for SW and 21 for SW2 or whatever works for you.

It makes it even easier if you take the time to make descriptions under the
physical ports and logical portchannel as to where the other end is :-)
Larry Hadrava
CCIE #12203 CCNP CCNA
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com

On Sun, May 24, 2009 at 6:25 PM, Larry Hadrava <larryh_at_ipexpert.com> wrote:

> Channel-groups are uniqie to the switch.
>
> So for what you are talking about you could have:
>
> SW1----Channel-group 1------SW2
> | |
> | <--channel-group 2 |<--channel-group 4
> | |
> | |
> SW3---Channel-group 3------SW4
>
> Where SW1 and SW2 use channel-group 1 for that link
> SW1 and SW3 use channel-group 2
> SW2 and SW4 use channel-group 4
> SW3 and SW4 sue channel-group 3
>
> OR you could use a different channel-group number on each switch.
>
> For instance on links between SW1 and SW2 you could use
> SW1 - channel-group 12
> SW2 - channel-group 21
>
> Larry Hadrava
> CCIE #12203 CCNP CCNA
> Sr. Support Engineer  IPexpert, Inc.
> URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>
>
> On Sun, May 24, 2009 at 12:24 AM, qospf qospf
<cisco.qospf_at_gmail.com>wrote:
>
>> another silly question on that note. If I'm creating port-channels
>> basically
>> in a "square" shape with 4 switches (i.e. Sw1 has 2 ports to Sw 2 and 2 to
>> Sw3, Sw3 has 2 to Sw 1 and Sw4 and so on...). Is it necessary, to create a
>> different channel group for each link? can we name the links b/w the two
>> different switches to be "channel-group 1".
>>
>> thx
>>
>> On Sat, May 23, 2009 at 5:13 PM, Joe Astorino <jastorino_at_ipexpert.com
>> >wrote:
>>
>> > Glad you got it working Syed. I was going to say, that SHOULD work : )
>> > ... Just my other 2 cents sometimes I've seen weird things happen if the
>> > physical interface configuration doesn't match the Port-Channel
>> interface
>> > configuration as well. <shrug>
>> >
>> >
>> > Regards,
>> >
>> > Joe Astorino
>> > CCIE #24347 (R&S)
>> > Sr. Support Engineer - IPexpert, Inc.
>> > URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>> >
>> > -----Original Message-----
>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> > Syed
>> > Ali
>> > Sent: Saturday, May 23, 2009 7:52 PM
>> > To: Chris Breece
>> > Cc: Cisco certification
>> > Subject: Re: Etherchannel Issue
>> >
>> > Hi Chris,
>> > I noticed later that the UP state was temporary as I was
>> using
>> > wrong port numbers on remote end thats why the UP state was temp. Sorry
>> for
>> > the silly question guys. Desirable / Desirable is working just fine.
>> >
>> > thanks
>> > Syed
>> >
>> > On Sun, May 24, 2009 at 2:44 AM, Chris Breece <cbreece1_at_gmail.com>
>> wrote:
>> >
>> > > Hey Ron,
>> > >
>> > > What your describing sounds like "mode auto"
>> > >
>> > > Desirable + Auto = Good, Auto + auto = Bad. Auto basically being
>> passive.
>> > >
>> > > That's how I remember it atleast. I thought desirable + desirable
>> > > would came up. Can you post your Configs Syed?
>> > >
>> > > Thanks,
>> > > Chris
>> > >
>> > >
>> > >
>> > > On Sat, May 23, 2009 at 6:18 PM, <ron.wilkerson_at_gmail.com> wrote:
>> > >
>> > > > Desirable means it will become a channel if the other side wants to.
>> > > Can't
>> > > > have both ends willing and no one is trying to become a channel.
>> > > > -----Original Message-----
>> > > > From: Syed Ali <testcricket_at_gmail.com>
>> > > >
>> > > > Date: Sun, 24 May 2009 00:43:36
>> > > > To: Cisco certification<ccielab_at_groupstudy.com>
>> > > > Cc: Muhammad Zubair<zubair4pk_at_hotmail.com>
>> > > > Subject: Etherchannel Issue
>> > > >
>> > > >
>> > > > Hi experts,
>> > > > When I configure the PAgP (desirable) on both ends,
>> > > > the port channel is always down down. If I change one side to mode
>> > > > ON, the portchannel comes up. Can some one explain whats wrong with
>> > > > having PAgP
>> > > > (desirable) on both switches?
>> > > >
>> > > > thanks
>> > > > Syed
>> > > >
>> > > >
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Received on Sun May 24 2009 - 18:32:17 ART