From: Dan C (cdan2154@gmail.com)
Date: Sun Nov 19 2006 - 07:47:56 ART
Hi Ken,
1. Sometimes the downstream may be the root switch, all you need is to
configure one end only, check to see which switch is root then you will have
2 options:
A. To configure the port priority on the root
B. To configure the port cost on the non root switch
2. As far for running any retesting I think that cisco will record which was
your root switch at the time of your exam imho.
Cheers,
Dan
On 11/19/06, realone realone <cciebynov@gmail.com> wrote:
>
> 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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