From: Mas Kato (loomis_towcar@xxxxxxxxxxxxxx)
Date: Tue Dec 11 2001 - 04:21:31 GMT-3
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<The only problem with 0 is this means that it cannot be the root bridge or con
sidered 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 veri
fied this with CatOS and HP ProCurve.
The Cisco discussion of the "Root Guard" feature explicitly mentions the zero v
alue 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 prio
rity 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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