09-09-2008 02:06 PM - edited 03-06-2019 01:16 AM
Which of the following Bridge IDs would win the election.
32768:0200.1111.1111
32768:0200.2222.2222
200:0200.1111.1111
0200:0200.2222.2222
40,000:0200.1111.1111
09-09-2008 03:31 PM
this question is from the icnd 2 book but i think the answer is wrong!!!
09-09-2008 04:02 PM
Assuming there is no trick like 0200 being octal vs 200 decimal;-) I would vote for 200:0200.1111.1111
Regards,
Francois
09-10-2008 02:00 AM
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
09-10-2008 02:08 AM
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
09-10-2008 02:19 AM
Last Question,
How do you know if the extended System is used or not?
Thanks for all the help.
09-10-2008 05:12 AM
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
09-10-2008 08:51 AM
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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