From: Hossam (sam6626@yahoo.com)
Date: Sat Feb 28 2004 - 19:24:50 GMT-3
Group,
I understand that SPT while electing the root port for a switch goes in the following sequence:
1- Port Cost
2- Port Priorty
3- Port ID
In my lab setup this goes only when the two candidate root ports are connected to ONE switch
CATA CATB CATC--- ROOT
|--FA 0/1--FA 0/1---| |
| |-FA 0/3-----FA 0/3 ----|
|--FA 0/2--FA 0/2---| |
In the above diagram everything goes as expected. CATA-FA0/1 is FWD while CATA-FA0/2 ius BLK.
When i change port-priorty on CAT B-FA0/2 to 64 the roles are reversed. CATA-FA0/1 is BLK and CATA-FA0/2 is FWD. SO far so good.
My problem is when i replace CAT B with two separte Switches.
CATA CATB1 CATC--- ROOT
|--FA 0/1--FA 0/1---|--- FA0/3---FA0/3 ----|
| | |
| |
| |
| |--- FA 0/3--FA 0/3 ----|
|--FA 0/2--FA 0/2---| |
CATB2
In this setup CATA-FA 0/1 stays FWD even when i change the CATB2- FA0/2 port Priorty to 64?
I can only change the ROot port via the Port cost command in the second scenario?
For me it seems that port priorty does't envolve in the root port election process if the two candidate ports are connected to the same switch!!
Is that regular? or is there something that i am missing?
Thanks
SAM
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This archive was generated by hypermail 2.1.4 : Fri Mar 05 2004 - 07:13:59 GMT-3