Spanning tree

Unanswered Question
May 21st, 2010
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I am trying to troubleshoot a loop in my network and I may have found the problem.  Below is the output of the spanning tree on a switch


CompRmSw05#sh spanning-tree root

                                        Root    Hello Max Fwd
Vlan                   Root ID          Cost    Time  Age Dly  Root Port
---------------- -------------------- --------- ----- --- ---  ------------
VLAN0001         32769 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0010         32778 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0011         32779 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0012         32780 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0064         32769 000a.4144.1200        20    2   20  15  Gi4/0/1        
VLAN0065         32833 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0068         32836 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0069         32837 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0071         32839 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0072         32840 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0079         32847 000a.4144.1200        16    2   20  15  Gi4/0/25       
VLAN0084         32852 000a.4144.1200        16    2   20  15  Gi4/0/25      

I want the root port of VLAN64 (in bold) to go to Gi4/0/25.


If I shut down Gi4/0/1 and reload the switch.  Does anyone know if this will fix my loop and VLAN64 will force to go to Gi4/0/25?


Thanks


Alfred

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merryllem Fri, 05/21/2010 - 16:41
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Can you post a "show int trunk" output?. Diagrams also help if you have it.

dacruzer1 Fri, 05/21/2010 - 16:45
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I have attached a diagram and below is the "sh int trunk"


Thanks


CompRmSw05#sh int trunk

Port        Mode             Encapsulation  Status        Native vlan
Gi1/0/4     on               802.1q         trunking      1
Gi1/0/5     on               802.1q         trunking      1
Gi1/0/6     on               802.1q         trunking      1
Gi1/0/7     on               802.1q         trunking      1
Gi1/0/16    on               802.1q         trunking      1
Gi1/0/22    on               802.1q         trunking      1
Gi2/0/11    on               802.1q         trunking      1
Gi2/0/12    on               802.1q         trunking      1
Gi2/0/13    on               802.1q         trunking      1
Gi2/0/14    on               802.1q         trunking      1
Gi2/0/18    on               802.1q         trunking      1
Gi2/0/19    on               802.1q         trunking      1
Gi4/0/25    on               802.1q         trunking      1

Port        Vlans allowed on trunk
Gi1/0/4     1-4094
Gi1/0/5     1-4094
Gi1/0/6     1-4094
Gi1/0/7     1-4094
Gi1/0/16    1-4094
Gi1/0/22    1-4094
Gi2/0/11    1-4094
Gi2/0/12    1-4094
Gi2/0/13    1-4094
Gi2/0/14    1-4094
Gi2/0/18    1-4094
Gi2/0/19    1-4094
Gi4/0/25    1-4094

Port        Vlans allowed and active in management domain
Gi1/0/4     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/5     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/6     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/7     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/16    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/22    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/11    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/12    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/13    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/14    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/18    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/19    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi4/0/25    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853

Port        Vlans in spanning tree forwarding state and not pruned
Gi1/0/4     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/5     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/6     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/7     1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/16    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi1/0/22    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/11    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/12    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/13    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/14    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/18    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi2/0/19    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
Gi4/0/25    1,10-12,64-65,68-69,71-72,79,84-85,95-96,98,104,107,111,192,200-201,300-302,853
CompRmSw05#

ramji_avinash Sun, 05/23/2010 - 08:59
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I think u have to change the port-priority or the cost !!!!!


First it should be cost or the priority


might be the following command

spanning tree vlan 64 port-priority

spanning tree valn 64 cost

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