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Author Topic: Avaya 5510/5520 identify rstp root bridge or is there an issue?  (Read 132 times)

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Offline novice

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Avaya 5510/5520 identify rstp root bridge or is there an issue?
« on: January 09, 2018, 10:42:51 AM »
Hi

Came across a post on this forum suggesting to use the command
show spanning-tree rstp status
to identify rstp root bridge. Hence issued the command on network switches (mixture of 5010, 5020, stacked, unstacked running  v6.3.6.016 / v6.2.4.010)
The output is confusing because my understanding is that the output
Stp Root cost: 0
indicates the switch to be a root bridge.(Unless my understanding is incorrect) And there can only be one root bridge but many switches are showing Stp Root cost: 0. 
Below is the command output. Please advise how can the root bridge be identified?


sw1#show spanning-tree rstp status
Designated Root:        80:00:00:0E:40:B4:74:**
Stp Root Cost:          0
Stp Root Port:          0
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.10.87.
sw2#show spanning-tree rstp status
Designated Root:        80:00:00:1A:8F:83:D8:**
Stp Root Cost:          0
Stp Root Port:          0
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.10.88.
sw3#show spanning-tree rstp status
Designated Root:        80:00:00:15:70:38:0A:**
Stp Root Cost:          40200
Stp Root Port:          45
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.11.90.
5510-48T#show spanning-tree rstp status
Designated Root:        80:00:00:15:9B:C4:B4:**
Stp Root Cost:          0
Stp Root Port:          0
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.11.123.
5520-48T-PWR#show spanning-tree rstp status
Designated Root:        80:00:00:19:E1:9C:94:**
Stp Root Cost:          0
Stp Root Port:          0
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.11.94.
5520-48T-PWR#show spanning-tree rstp status
Designated Root:        80:00:00:11:F9:2F:60:**
Stp Root Cost:          0
Stp Root Port:          0
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.11.107.
5510-48T#show spanning-tree rstp status
% Invalid input detected at '^' marker.
5510-48T#show spanning-tree config
Bridge Priority (hex):      8000
Designated Root:            80000019E12B50**
Root Port:                  Unit:0  Port:0
Root Path Cost:             0
Hello Time:                 2 seconds
Maximum Age Time:           20 seconds
Forward Delay:              15 seconds
Bridge Hello Time:          2 seconds
Bridge Maximum Age Time:    20 seconds
Bridge Forward Delay:       15 seconds
Tagged BPDU on tagged port: No
VID used for Tagged BPDU:   4001
STP Group State:            Active
STP Multicast Address:      01-80-C2-00-00-00

Connected to 10.10.11.93.
sw6#show spanning-tree rstp status
Designated Root:        80:00:00:0F:06:7E:58:**
Stp Root Cost:          0
Stp Root Port:          0
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.11.176.
sw4#show spanning-tree rstp status
Designated Root:        80:00:00:15:70:38:0A:**
Stp Root Cost:          20000
Stp Root Port:          1/43
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.11.91.
5510-48T#show spanning-tree rstp status
Designated Root:        80:00:00:12:83:0B:E8:**
Stp Root Cost:          0
Stp Root Port:          0
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds
Connected to 10.10.11.155.
sw5#show spanning-tree rstp status
Designated Root:        80:00:00:15:9B:C2:78:**
Stp Root Cost:          20000
Stp Root Port:          4/33
Stp Max Age:            20 seconds
Stp Hello Time:         2 seconds
Stp Forward Delay Time: 15 seconds


Thanks in advance.

 


Offline pat2012

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Re: Avaya 5510/5520 identify rstp root bridge or is there an issue?
« Reply #1 on: February 09, 2018, 09:27:08 AM »
To properly interpret this, a diagram of the network would be required.  Do you use an MLTs?  These would/should have STP disabled so the switch would not participate in Spanning Tree - Root Cost:0, Root Port:0.  At least that's what I'm thinking.  :-)