Thanks for the reply Jay, CAT4 is the root per task 3.5. With CAT4 as the root, I am not sure why this should not work as is.
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]> From: Jay Taylor [mailto:[email protected]] Sent: Monday, October 18, 2010 2:20 PM To: Baldwin, Patrick A. Cc: [email protected] Subject: Re: [OSL | CCIE_RS] Volume 1 Task 3.8 If I remember correctly it depends on which switch ends up being the root in your topology. In at least 1 config of that lab I added the following on Cat2 to make things work as expected: int ra fa0/21-22 span mst 0 cost 100000 On Mon, Oct 18, 2010 at 2:53 PM, Baldwin, Patrick A. <[email protected]<mailto:[email protected]>> wrote: 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<http://www.ipexpert.com>
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
