From: Bob Sinclair (bsin@cox.net)
Date: Mon Dec 27 2004 - 10:46:15 GMT-3
Tim,
Thanks for the good wishes - had a great day with the family! All the best
to you, yours and the other highly intelligent, generous and motivated folks
who populate this list!
Re PAgP - U got it! I think the critical factor is that the "on" and "off"
modes do not send negotiation frames.
Bob Sinclair
CCIE #10427, CCSI 30427, CISSP
www.netmasterclass.net
----- Original Message -----
From: "ccie2be" <ccie2be@nyc.rr.com>
To: "Bob Sinclair" <bsin@cox.net>; "Group Study" <ccielab@groupstudy.com>
Sent: Monday, December 27, 2004 8:28 AM
Subject: Re: 3550 & Etherchannels
> Hey Bob,
>
> Merry Christmas. I hope you had a great holiday.
>
> Thanks for getting back to me.
>
> So, basically on a 3550, PagP doesn't do anything automatically and
> therefore, if you want an ehterchannel between 2 3550's, both sides
>
> have to be configured.
>
> However, if we're talking about other models Cat's, for example, 6500 or
> 5000, then PagP will automatically create an etherchannel if only side is
> configured correctly.
>
> Is that what you're saying?
>
> Thanks, Tim
> ----- Original Message -----
> From: "Bob Sinclair" <bsin@cox.net>
> To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>
> Sent: Monday, December 27, 2004 8:14 AM
> Subject: Re: 3550 & Etherchannels
>
>
>> 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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>>
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