From: Frei Peter (Peter.Frei@xxxxxxxx)
Date: Tue Dec 11 2001 - 12:38:08 GMT-3
>From command reference Guide CatOs 6.1
set spantree priority
Use the set spantree priority command to set the bridge priority for a VLAN.
set spantree priority bridge_priority [vlan]
Syntax Description
bridge_priority Number representing the priority of the bridge; vaild
values are 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864,
40960, 45056, 49152, 53248, 57344, and 6144, with 0 indicating high priority
and 61440, low priority.
vlan (Optional) Number of the VLAN. If you do not specify a VLAN number,
VLAN 1 is used; valid values are from 1 to 1005.
Defaults
The default configuration has the bridge priority set to 32768.
Command Types
Switch command.
Command Modes
Privileged.
Usage Guidelines
This feature is not supported for the RSM.
Examples
This example shows how to set the bridge priority of VLAN 1 to 4096:
Console> (enable) set spantree priority 4096
VLAN 1 bridge priority set to 4096.
Console> (enable)
-----Urspr|ngliche Nachricht-----
Von: Mas Kato [mailto:loomis_towcar@speedracer.com]
Gesendet: Dienstag, 11. Dezember 2001 08:22
An: rodgers@the-moores.org
Cc: ccielab@groupstudy.com; jianxin.liu@invisix.com
Betreff: 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
>> >
>> >
>> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:32:41 GMT-3