Mind Games - MST

All,

I really hate questions like this, hence the reason I have problems with
the CCIE lab.
Help me understand this supposedly easy question.

s1 =====19/20===== s2
 || ||
 || ||
21/22 21/22
 || ||
 || ||
s3=====19/20======s4

*Task 7.1*

Due to large number of VLANS that exist within the current network, the
decision has been taken to migrate from 802.1 W spanning tree to 802.1S
across all switches. Configure 802.1S spanning tree configuration with *3
instances* as follows:

Region Name: CCIE
Revision: 10
*Instance 3* -- All other VLANs
Instance 1 -- VLAN 10 and 12
Instance 2 -- VLAN 11 and 13

My Question ???? :
Do you create;
instance 1
instance 2
instance 3

*Task 7.2*
With 3560-1 as the core connected switch using 802.1S spanning-tree,
perform *traffic balancing* so that all traffic for VLANs contained in
Instance 1 is sent out of ports fa0/19 and fa0/20, Instance 2 is sent out
of portFa0/21 and Fa0/22, and *Instance 0 must not be load balanced*.

Use the port-priority command on 3560-1 to alter the path that traffic
takes on switches 3560-2, 3560-3, and 3560-4 using interface cost.
Ensure 3560-1 is the root switch for all instances.

My Question ???? :
Based on Task 7.1, the first part of this task 7.2 would lead you into
only creating instance 2, & instance 1 and leaving instance 0 as the
All-other-VLANs? I would understand that if the put that CIST must be
compatible, this would require me to use instance 0 for all the other
VLANs, but this is not stated in the question so I'm again overreading, not
reading enough or something.

The second part of this task is confusing: What does this want you to do.
"apply port-priority only on Sw1, and using Cost on SW2-SW3-SW4"

Sorry, but I really hate the type of language or lack thereof Cisco uses on
the CCIE LAB.

Thanks,
JS

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Received on Tue Oct 16 2012 - 10:59:47 ART