From: sabrina pittarel (sabri_esame@yahoo.com)
Date: Thu Aug 31 2006 - 14:35:31 ART
No,
spanning-tree vla XX root is a macro command.
It sets the local bridge priority to be less than the current lowest priority in your switched network ("how much" lower is well defined, but I don't have the rule on the top of my mind ), essentially it kicks away your current root bridge.
BUT if you later add another switch with an even lower priority then the new bridge will become root.
Leaving the "spanning-tree vla XX root" in the running config gives you the wrong idea that this switch will be root no matter what. That's not the case
Sabrina
----- Original Message ----
From: Bajo <bajoalex@gmail.com>
To: Cisco certification <ccielab@groupstudy.com>
Sent: Thursday, August 31, 2006 9:08:31 AM
Subject: spanning-tree vla XX root and "sh run"
Hi GS,
Is it an IOS bug that the "sh run | in spannin" will NOT show the
spanning-tree vlan XXXX root config?
I know I can check if the config works by doing "sh spann vla XXXX"
Check this out:
CAT1) conf t
CAT1(config)#spann vl 16 root pri
CAT1(config)#end
CAT1#sh run | in spann
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree vlan 16 priority 24576
spanning-tree vlan 16 port-priority 32
spanning-tree vlan 16 port-priority 16
CAT1#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(20)EA1a, RELEASE
SOFTWARE (fc1)
-- Kind Regards,Bajo
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