From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Sun Oct 31 2004 - 01:39:03 GMT-3
EtherChannel is supported on the routers, and uses the same
syntax as the 3550 does. However, AFAIK no platform that is used in the
lab supports the feature.
To answer your question Tim, you must ensure that the modes are
compatible, otherwise a channel will not form. The valid modes are:
on - on
desirable - auto (PAgP)
desirable - desirable (PAgP)
active - passive (LACP)
active - active (LACP)
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> mani poopal
> Sent: Saturday, October 30, 2004 10:42 PM
> To: ccie2be; Group Study
> Subject: Re: Layer 2 EtherChannels on Routers
>
> Hi Tim,
>
> According to my understanding, they will never ask you to configure
> etherchannel between a router and a switch. Etherchannel(L2 or L3) is
> between two switches. Only possible way to connect from a router a
> swith environment is a router on a stick(trunking-isl or 802.1q).
>
> thanks
>
> Mani
>
> ccie2be <ccie2be@nyc.rr.com> wrote:
> Hi guys,
>
> I'd like to confirm something.
>
> Regarding the routers used in the lab, even though these routers
support
> both
> trunking protocols, ISL and 802.1q, they don't support DTP (Dynamic
> Trunking
> Protocol), correct?
>
> Also, from what I can tell, routers don't suppport either of the
> EtherChannel
> aggregation protocols, LACP or PagP, true?
>
> Now, assuming the above statements are true, I'm wondering how the
3550
> side
> of the links connected to a router should be configured. If the router
> doesn't support any of these negotiation protocols, I assume that on
the
> 3550
> side, I should make sure no negotiation is done. Is this assumption
> correct?
> Also, what happens if I forget or misconfigure the 3550 side such that
it
> tries to negotiate with the router? Will there still be connectivity
> between
> the 3550 and the router or will the link (etherchannel) never pass
> traffic?
>
> I don't know how likely it is to see a layer 2 or 3 etherchannel
between a
> 3550 and a router show up on the lab, but I figure I better know how
this
> is
> done in advance rather than trying to figure it out during the actual
lab.
>
> TIA, Tim
>
>
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