Ethernet Switching
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Ethernet Switching

Spanning -tree

‎01-24-2016 08:26 PM

 

 

Hi Team,

 

I have a core switch 4600 and a EX 2200 Connected to it as trunk, I am running vstp and core is set to bridge pririty of 4k,

 

the ex switch prioruty was set to 16 K, but Still I see EX 2200 spanning tree as the root bridge , not the core switch ? I was thinking that the EX should be having the roodbidge of Core.

 

* Note there is only one trunk connected between EX 4600 and EX 2200. 

* I have only shown a vlan due to space limitation

 

 

ON EX 2200

=====================

set protocols rstp disable

set protocols vstp vlan all bridge-priority 16k

 

root@sw-11> show spanning-tree bridge 

STP bridge parameters for VLAN 56

  Root ID                           : 16440.44:f4:77:69:5b:01

  Hello time                        : 2 seconds

  Maximum age                       : 20 seconds

  Forward delay                     : 15 seconds

  Message age                       : 0 

  Number of topology changes        : 0

  Local parameters 

    Bridge ID                       : 16440.44:f4:77:69:5b:01

    Extended system ID              : 1

    Internal instance ID            : 0

 

 

 

ON EX 4600 (Core)

=============================

set protocols vstp vlan 56 bridge-priority 4k

 

STP bridge parameters for VLAN 60

  Root ID                           : 4156.54:4b:8c:b6:5d:e2

  Hello time                        : 2 seconds

  Maximum age                       : 20 seconds

  Forward delay                     : 15 seconds

  Message age                       : 0 

  Number of topology changes        : 18

  Time since last topology change   : 914034 seconds

  Local parameters 

    Bridge ID                       : 4156.54:4b:8c:b6:5d:e2

    Extended system ID              : 60

 

 

1 REPLY 1
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Ethernet Switching

Re: Spanning -tree

[ Edited ]
‎01-25-2016 05:14 AM

http://www.juniper.net/techpubs/en_US/junos15.1/topics/example/vstp_on_qfx_example.html

 

And one more thing:

Note: When configuring xSTP on EX4300 and EX4600 switches, you must add all the interfaces in the applied VLANs in configurations. For MSTP, configure all interfaces in all VLANs at the [edit protocols mstp interface] hierarchy level.