I am having an issue with port-priority influencing the root cost of its
downstream neighbor. I have configured the port-priority according to the DSG
on Cat2 Fa0/24:
Cat2-MST(config-if)#do sh run int f0/24
Building configuration...
Current configuration : 107 bytes
!
interface FastEthernet0/24
switchport mode dynamic desirable
spanning-tree mst 0 port-priority 64
End
But Cat 1 still shows the secondary link to Cat3 as its root port, and does not
appear to have learned the preferred priority to Cat2.
Cat1-MST(config-if)#do sh span
MST0
Spanning tree enabled protocol mstp
Root ID Priority 24576
Address 0018.baf8.5a80
Cost 0
Port 21 (FastEthernet0/21)
Hello Time 3 sec Max Age 15 sec Forward Delay 15 sec
Bridge ID Priority 32768 (priority 32768 sys-id-ext 0)
Address 000b.be96.d800
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1 Desg FWD 200000 128.1 P2p
Fa0/4 Desg FWD 200000 128.4 P2p
Fa0/5 Desg FWD 200000 128.5 P2p
Fa0/11 Desg FWD 2000000 128.11 Shr
Fa0/21 Root FWD 200000 128.21 P2p
Fa0/23 Altn BLK 200000 128.23 P2p
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/24 Altn BLK 200000 128.24 P2p
I have shut/no shut all relevant interfaces, but still no change. I have even
removed and re-added the port-priority config on Cat2.
Any ideas what I may be missing?
Thanks,
Rob
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