Francois Tallet Tue, 09/09/2008 - 16:02

Assuming there is no trick like 0200 being octal vs 200 decimal;-) I would vote for 200:0200.1111.1111

Regards,

Francois

shane.kearney Wed, 09/10/2008 - 02:00

Am I wrong to think the bridge IDs can only be in multiples of 4096?

by the way you are correct and i was wrong

Giuseppe Larosa Wed, 09/10/2008 - 02:08

Hello Shane,

bridge IDs can only be in multiples of 4096 if using extended system-id otherwise they can be any value between 0 and 65535.


Hope to help

Giuseppe


shane.kearney Wed, 09/10/2008 - 02:19

Last Question,

How do you know if the extended System is used or not?

Thanks for all the help.

Giuseppe Larosa Wed, 09/10/2008 - 05:12

Hello Shane,

two ways


a) from configuration


b) do sh spanning-tree vlan 1


and

sh spanning-tree vlan x


if using extended id:


bridge priority in vlan x will be:


base pri + x


if not using extended id


bridge pri in vlan x = bridge pri in vlan 1


but MAC address differ


(the extended id feature is also called mac address reduction for this reason)


Hope to help

Giuseppe


Francois Tallet Wed, 09/10/2008 - 08:51

Note that even with extended sysid, the priority will end up within the range 0-65535. Sure, you can only configure the higher 4 bits of the priority (by increment of 4096 indeed), but as you eventually add the vlan number to this configured priority, you end up with a figure that utilize the whole 64k range.

Regards,

Francois

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