From: realone realone (cciebynov@gmail.com)
Date: Sun Nov 19 2006 - 03:52:54 ART
Hi GS,
When we do load sharing between two switches (connected using 2 trunk ports)
We have two options.
1, Use Path cost in the downstream switch
2. Use the port priority on the upstream switch (root in the lab, as we have
only 2 switches)
Example: assume Sw1 as the root and using the first option - port priority
Sw1:
C3550(config)#inr fas0/1
C3550(config-if)#spanning-tree vlan 2 port-priority 16
C3550(config-if)#spanning-tree vlan 4 port-priority 16
C3550(config-if)#spanning-tree vlan 6 port-priority 16
C3550(config-if)switchport trunk allowed vlan 2,4,6,3,5,7
C3550(config)#inr fas0/2
C3550(config-if)#spanning-tree vlan 3 port-priority 16
C3550(config-if)#spanning-tree vlan 5 port-priority 16
C3550(config-if)#spanning-tree vlan 7 port-priority 16
C3550(config-if)switchport trunk allowed vlan 2,4,6,3,5,7
This config load balances the traffic based on port priority between two
trunks.
My question is should we apply the same config to the downstream switch (SW2
in the LAB). The reason am asking the question is -- this configs works as
long as the sw1 is the root switch. If the SW2 becomes root switch (as
someone said in the GS, may be proctor copies this config and paste on to
another rack for evaluation, where sw1 may become backup), then this config
doesnt work. Therefore on the safer side should we apply this on both the
switches (which causes no harm in the lab).
Any inputs on this would be appreciated.
Thanks.
Ken.
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