From: Brant Stevens (branto@xxxxxxxxxxxxx)
Date: Tue Dec 11 2001 - 04:40:27 GMT-3
I would like to add that the VLAN number should be specified, otherwise it
will only change the Root bridge for VLAN 1.
After reading the documents offered on TAC, I tend to agree that an STP
priorit of 0 is the best there can be; unless there is also another switch
in the network with a priority of 0 and a lower MAC address, in which case
that switch wil become the STP root bridge...
-Brant.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Mas Kato
Sent: Tuesday, December 11, 2001 2:22 AM
To: rodgers@the-moores.org
Cc: ccielab@groupstudy.com; jianxin.liu@invisix.com
Subject: Re: Root Bridge
[demime could not interpret encoding binary - treating as plain text]
<The only problem with 0 is this means that it cannot be the root bridge or
considered in choosing a root bridge>
Interesting. In every implementation I've dealt with, a bridge with a
priority of zero indeed becomes the root bridge and only another bridge with
a priority of zero and a lower bridge ID (MAC) can become root over it. I've
recently verified this with CatOS and HP ProCurve.
The Cisco discussion of the "Root Guard" feature explicitly mentions the
zero value and its effect, at least on CatOS:
http://www.cisco.com/warp/customer/473/74.html.
Since the 802.1D standard isn't explicit about zero (just "lower" numbers
mean higher root priority), I'd be interested to know what implementations
take priority zero as a special case so I can file it away as a 'caveat.'
Regards,
Mas Kato
https://ecardfile.com/id/mkato
>Date: Mon, 10 Dec 2001 22:53:02 -0500
> Rodgers Moore <rodgers@the-moores.org>Reply-To: rodgers@the-moores.org
> Liu Jianxin-qch1927 <Jianxin.Liu@invisix.com> Re: Root Bridge
>The only problem with 0 is this means that it cannot be the root bridge or
>considered in choosing a root bridge. 1 is the lowest value and highest
>priority for a device to be root.
>
>Rodgers Moore, CCIE# 8153
>
>Liu Jianxin-qch1927 wrote:
>
>> Yesterday somebody mentioned the 1 is the lowest value.
>>
>> But I check the CD, the range is from 0 to 65535.
>>
>> set spantree priority 0 should be the right answer.
>>
>> -----Original Message-----
>> From: Albert Lu [mailto:albert_ccie@yahoo.com]
>> Sent: Sunday, December 09, 2001 6:46 PM
>> To: 'Mas Kato'
>> Cc: ccielab@groupstudy.com
>> Subject: RE: Root Bridge
>>
>> So what does setting the port priority to 8192 do? Isn't that the magic
>> number?
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>> Mas Kato
>> Sent: Sunday, December 09, 2001 7:11 PM
>> To: ccielab@groupstudy.com; c_ccie@hotmail.com
>> Subject: RE: Root Bridge
>>
>> [demime could not interpret encoding binary - treating as plain text]
>> To assure it, use the 'set spantree priority 0' command.
>>
>> Regards,
>>
>> Mas Kato
>> https://ecardfile.com.id/mkato
>>
>> > "CCIE Cisco" <c_ccie@hotmail.com> ccielab@groupstudy.com Root
BridgeDate:
>> Sat, 08 Dec 2001 22:00:48 -0500
>> >Reply-To: "CCIE Cisco" <c_ccie@hotmail.com>
>> >
>> >Hi,
>> >
>> >what is the command to make Catalyst5000 as root bridge without using
>> >spantree root command.
>> >
>> >Thanks
>> >
>> >
>> >
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