From: Bob Sinclair (bsin@cox.net)
Date: Mon Dec 27 2004 - 10:14:37 GMT-3
Tim,
Unlike most Cisco switches I have worked with over the years, the default
channel mode on the 3550 is "off", which cannot be set directly, but is the
absence of other channel mode configurations.
The following PAgP modes should result in a channel:
Desirable-Desirable
Desirable-Auto
Note that "on" is not a PAgP mode, but a static, no-negotiate setting. Very
unlike the trunking modes!
For real fun, practice with the LACP modes (Active and Passive) and look
into its "hot-standby" feature.
HTH,
Bob Sinclair
CCIE #10427, CCSI 30427, CISSP
www.netmasterclass.net
----- Original Message -----
From: "ccie2be" <ccie2be@nyc.rr.com>
To: "Group Study" <ccielab@groupstudy.com>
Sent: Monday, December 27, 2004 8:01 AM
Subject: 3550 & Etherchannels
> Hey guys,
>
> I had the impression that PagP could be used to automatically create a L2
> Etherchannel by just configuring one side of the link,
>
> but I couldn't get it to work.
>
> Here's the topology:
>
> Cat-1 ----- Cat-2
>
> Both 3550's are connected to each other via 3 links
>
> fa0/13 --- fa0/13
> fa0/14 --- fa0/14
> fa0/15 --- fa0/15
>
> and each interface starts out with the default configuration
>
> I used the command on Cat-1, channel-group 1 mode desirable, on all 3
> interfaces. But, until I also configured Cat-2 the
>
> etherchannel wouldn't come up.
>
> Do both sides of an etherchannel always have to be configured for the
> etherchannel to come up?
>
> If not, how should etherchannel be configured on one side so that the
> other
> side comes up?
>
> If so, what's the point of PagP?
>
> TIA, Tim
>
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