Afternoon,
Performing Task 3.8 of Volume 1, I cannot duplicate the results in the DSG
If the links between Cat1 and Cat4 fail, the backup path should be the highest
port number to cat3. if this link fails, the highest port number to cat2
should come next in line. if changes are made on cat1, cat1 is only allowed
one interface command.
This task is to teach us to use the port-priority command to manipulate
spanning-tree, once all interfaces have a cost of 200000, manipulating the port
priority on cat2 port f1/0/24 in my case should cause that port to be used by
cat1.
Cat2-MST(config-if)# spanning-tree mst 0 port-priority 64
Cat2-MST(config-if)#^Z
Cat2-MST#sh span
1d17h: %SYS-5-CONFIG_I: Configured from console by console
Cat2-MST#sh span int f1/0/24
Mst Instance Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
MST0 Desg FWD 200000 64.26 P2p
Cat1-MST(config-if-range)#do sh span
MST0
Spanning tree enabled protocol mstp
Root ID Priority 24576
Address 001a.a1fc.dc00
Cost 0
Port 23 (FastEthernet1/0/21)
Hello Time 3 sec Max Age 15 sec Forward Delay 15 sec
Bridge ID Priority 32768 (priority 32768 sys-id-ext 0)
Address 001b.2bde.c000
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa1/0/1 Desg FWD 200000 128.3 P2p
Fa1/0/2 Desg FWD 200000 128.4 P2p
Fa1/0/4 Desg FWD 200000 128.6 P2p
Fa1/0/5 Desg FWD 200000 128.7 P2p
Fa1/0/11 Desg FWD 200000 128.13 P2p
Fa1/0/13 Desg FWD 200000 128.15 P2p
Fa1/0/14 Desg FWD 200000 128.16 P2p
Fa1/0/15 Desg FWD 200000 128.17 P2p
Fa1/0/16 Desg FWD 200000 128.18 P2p
Fa1/0/18 Desg FWD 200000 128.20 P2p
Fa1/0/21 Root FWD 200000 128.23 P2p
Fa1/0/23 Altn BLK 200000 128.25 P2p
Fa1/0/24 Altn BLK 200000 128.26 P2p
Port f1/0/24 should be Root FWD, but is still blocking?? Any idea what I did
wrong or is this a bug? I have verified with CDP that CAT1 and CAT2 are
connected on f1/0/24.
Patrick A. Baldwin (Alex)
Network Engineering
Colsa Corp., HOSC Contract
NASA , Marshall Space Flight Center
*Office: (256) 544-2089
ÊFax: (256) 544-8629
*E-mail: [email protected]<mailto:[email protected]>
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
