01-23-2008 02:59 AM - edited 03-05-2019 08:39 PM
Hi,
In order to set a switch as the root bridge for STP I can use one of the following two methods:
spanning-tree vlan 'vlan-id' priority 4096
or
spanning-tree vlan 'vlan-id' root {primary}
Is there any other method to configure a switch (3550) as the root bridge ?
I was thinking along the lines of changing the MAC address if the two priorities are tied.
Cheers,
Phil.
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01-23-2008 03:49 AM
Hi Phil
You cannot change the mac-addresses used for STP calculation on fixed chassis switches - see attached link for details
So as the mac-addresses will always be different on different switches manipulating the priority either up or down on switches is the only way to affect the root bridge election.
HTH
Jon
01-23-2008 03:49 AM
Hi Phil
You cannot change the mac-addresses used for STP calculation on fixed chassis switches - see attached link for details
So as the mac-addresses will always be different on different switches manipulating the priority either up or down on switches is the only way to affect the root bridge election.
HTH
Jon
01-23-2008 07:41 AM
Best way is to set STP priority to 0.
This puts switch unconditionally into STP root for VLAN so no other switch can ever beat it.
If you take a step further to make your LAN more deterministic then force another switch to become a secondary
Example: make Switch-1 to become ROOT Bridge for Vlan 100 and 101
Switch-1#
spanning-tree vlan 100,101 priority 0
Switch-2#
spanning-tree vlan 100,101 priority 4096
This makes you LAN solid.
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