Description

If the MSTP configuration between two switches differ, CIST (Common Spanning Tree) will converge; but MST Instances will not converge, as the configuration's Digest Value will not match.

Both of the switches will become the Root Bridge for the spanning tree for all MST Instances.


Symptoms

Topology
SW1 ---------- SW2
 \            /
  \          /
   \       /
      SW3
SW1 and SW2 are connected by the ge-0/0/0 interface, SW2 and SW3 are connected by the ge-0/0/1 interface, and SW1 and SW3 are connected by the ge-0/0/1 and ge-0/0/0 interfaces respectively. All the switches are connected to each other via trunk ports, on which all the VLANs are allowed.

Note : RSTP has been disabled on all the switches.

SW1 MSTP configuration :
[edit protocols mstp]
root@SW1# show
configuration-name MSTP-TEST;
revision-level 1;
msti 1 {
    vlan [ 10 20 ];
}
msti 2 {
    vlan [ 30 40 ];
}
msti 3 {
    vlan 50;
}
SW2 MSTP configuration :
[edit protocols mstp]
root@SW2# show
configuration-name MSTP-TEST;
revision-level 1;
msti 1 {
    vlan [ 10 20 ];
}
msti 2 {
    vlan [ 30 40 ];
}
msti 3 {
    vlan 50;
}
SW3 MSTP configuration :
[edit protocols mstp]
root@SW3# show
configuration-name MSTP-TEST;
revision-level 1;
msti 1 {
    vlan [ 10 20 ];
}
msti 2 {
    vlan 40;  < VLAN 30 has not been defined under MSTP Configuration for SW3
}
msti 3 {
    vlan 50;
}
Verifying MSTP activity :
root@ SW1 > show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : MSTP-TEST
Revision : 1
Configuration digest :
0x41d7ceff27df8ac1a030e73bee0a1af2 < Configuration Digest is same as SW2

MSTI Member VLANs
0         0-9,11-19,21-29,31-39,41-49,51-4094
1        10,20
2        30,40
3        50

root@ SW2 > show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : MSTP-TEST
Revision : 1
Configuration digest : 0x41d7ceff27df8ac1a030e73bee0a1af2 < Configuration Digest is same as SW1

MSTI Member VLANs
0        0-9,11-19,21-29,31-39,41-49,51-4094
1       10,20
2       30,40
3       50

root@ SW3 > show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : MSTP-TEST
Revision : 1
Configuration digest : 0x6393cdfbb7cd99b338597be6abd813dd < Configuration Digest is Different from SW1 & SW2

MSTI Member VLANs
0        0-9,11-19,21-39,41-49,51-4094
1       10,20
2       40
3       50
Verifying MSTP Convergence :
root@ SW1 > show spanning-tree bridge

STP bridge parameters
Context ID : 0
Enabled protocol : MSTP

STP bridge parameters for CIST
Root ID : 32768. b0:c6:9a:6a:72:80 < SW3 is the CIST Root Bridge
Root cost : 20000
Root port : ge-0/0/0.0
CIST regional root : 32768.b0:c6:9a:6a:d1:00
CIST internal root cost : 20000
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Message age : 1
Number of topology changes : 1
Time since last topology change : 2264 seconds
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32768. b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 0

STP bridge parameters for MSTI 1
MSTI regional root : 32769. b0:c6:9a:6a:d1:00 < SW2 is the MSTP Root Bridge for Instance 1
Root cost : 20000
Root port : ge-0/0/0.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 2
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32769.b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 1

STP bridge parameters for MSTI 2
MSTI regional root : 32770. b0:c6:9a:6a:d1:00
Root cost : 20000
Root port : ge-0/0/0.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 2
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32770.b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 2

STP bridge parameters for MSTI 3
MSTI regional root : 32771. b0:c6:9a:6a:d1:00
Root cost : 20000
Root port : ge-0/0/0.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 2
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32771. b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 3
root@ SW2 > show spanning-tree bridge

STP bridge parameters
Context ID : 0
Enabled protocol : MSTP

STP bridge parameters for CIST
Root ID : 32768. b0:c6:9a:6a:72:80 <  SW3 is the CIST Root Bridge
Root cost : 20000
Root port : ge-0/0/1.0
CIST regional root : 32768.b0:c6:9a:6a:d1:00
CIST internal root cost : 0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 20
Message age : 1
Number of topology changes : 2
Time since last topology change : 2273 seconds
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:72:81
Local parameters
Bridge ID : 32768. b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 0

STP bridge parameters for MSTI 1
MSTI regional root : 32769. b0:c6:9a:6a:d1:00 < Local Switch is the MSTP Root Bridge for Instance 1
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 2
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:d3:b1:80
Local parameters
Bridge ID : 32769.b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 1

STP bridge parameters for MSTI 2
MSTI regional root : 32770. b0:c6:9a:6a:d1:00
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 2
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:d3:b1:80
Local parameters
Bridge ID : 32770. b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 2

STP bridge parameters for MSTI 3
MSTI regional root : 32771. b0:c6:9a:6a:d1:00
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 2
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:d3:b1:80
Local parameters
Bridge ID : 32771. b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 3

------------------------------------------------------------------------------------------

root@ SW3 > show spanning-tree bridge

STP bridge parameters
Context ID : 0
Enabled protocol : MSTP

STP bridge parameters for CIST
Root ID : 32768. b0:c6:9a:6a:72:80 < Local Switch is the CIST Root Bridge
CIST regional root : 32768.b0:c6:9a:6a:72:80
CIST internal root cost : 0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 1
Time since last topology change : 2278 seconds
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:d1:01
Local parameters
Bridge ID : 32768. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 0

STP bridge parameters for MSTI 1
MSTI regional root : 32769. b0:c6:9a:6a:72:80 < Local Switch is the MSTP Root Bridge for Instance 1
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 1
Topology change initiator : ge-0/0/1.0
Local parameters
Bridge ID : 32769. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 1

STP bridge parameters for MSTI 2
MSTI regional root : 32770. b0:c6:9a:6a:72:80
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 1
Topology change initiator : ge-0/0/1.0
Local parameters
Bridge ID : 32770. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 2

STP bridge parameters for MSTI 3
MSTI regional root : 32771. b0:c6:9a:6a:72:80
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 1
Topology change initiator : ge-0/0/1.0
Local parameters
Bridge ID : 32771. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 3
Verifying the status of the Spanning Tree Interface :

root@ SW1 > show spanning-tree interface

Spanning tree interface parameters for instance 0

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32768.b0c69a6ad100 20000 FWD ROOT
ge-0/0/1.0 128:514 128:513 32768.b0c69a6a7280 20000 BLK ALT

Spanning tree interface parameters for instance 1

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32769.b0c69a6ad100 20000 FWD ROOT
ge-0/0/1.0 128:514 128:514 32769.b0c69ad3b180 20000 BLK ALT

Spanning tree interface parameters for instance 2

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32770.b0c69a6ad100 20000 FWD ROOT
ge-0/0/1.0 128:514 128:514 32770.b0c69ad3b180 20000 BLK ALT

Spanning tree interface parameters for instance 3

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32771.b0c69a6ad100 20000 FWD ROOT
ge-0/0/1.0 128:514 128:514 32771.b0c69ad3b180 20000 BLK ALT

------------------------------------------------------------------------------------------

root@ SW2 > show spanning-tree interface

Spanning tree interface parameters for instance 0

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32768.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32768.b0c69a6a7280 20000 FWD ROOT

Spanning tree interface parameters for instance 1

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32769.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32769.b0c69a6ad100 20000 FWD MSTR

Spanning tree interface parameters for instance 2

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32770.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32770.b0c69a6ad100 20000 FWD MSTR

Spanning tree interface parameters for instance 3

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32771.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32771.b0c69a6ad100 20000 FWD MSTR

------------------------------------------------------------------------------------------

root@ SW3 > show spanning-tree interface

Spanning tree interface parameters for instance 0

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32768.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32768.b0c69a6a7280 20000 FWD DESG

Spanning tree interface parameters for instance 1

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32769.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32769.b0c69a6a7280 20000 FWD DESG

Spanning tree interface parameters for instance 2

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32770.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32770.b0c69a6a7280 20000 FWD DESG

Spanning tree interface parameters for instance 3

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32771.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32771.b0c69a6a7280 20000 FWD DESG

Solution


MSTP will converge, only when MSTP has the identical configuration for the instances and VLANs under each instance:

Configuration change on SW3

[edit protocols mstp]
root@SW3# set msti 2 vlan 30

[edit protocols mstp]
root@SW3# commit
commit complete

[edit protocols mstp]
root@SW3# show
configuration-name MSTP-TEST;
revision-level 1;
msti 1 {
     vlan [ 10 20 ];
}
msti 2 {
    vlan [ 30 40 ]; < SW3 is now having the identical configuration for MST Instances
}
msti 3 {
     vlan 50;
}
Verifying MSTP activity :
root@ SW1 > show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : MSTP-TEST
Revision : 1
Configuration digest : 0x41d7ceff27df8ac1a030e73bee0a1af2

MSTI Member VLANs
0 0-9,11-19,21-29,31-39,41-49,51-4094
1 10,20
2 30,40
3 50
------------------------------------------------------------------------------------------

root@ SW2 > show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : MSTP-TEST
Revision : 1
Configuration digest : 0x41d7ceff27df8ac1a030e73bee0a1af2

MSTI Member VLANs
0 0-9,11-19,21-29,31-39,41-49,51-4094
1 10,20
2 30,40
3 50

root@ SW3 > show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : MSTP-TEST
Revision : 1
Configuration digest : 0x41d7ceff27df8ac1a030e73bee0a1af2 < SW3 is now having the same Configuration Digest Value as of SW1 & SW2

MSTI Member VLANs
0 0-9,11-19,21-29,31-39,41-49,51-4094
1 10,20
2 30,40
3 50
Verifying MSTP convergence :
root@ SW1 > show spanning-tree bridge

STP bridge parameters
Context ID : 0
Enabled protocol : MSTP

STP bridge parameters for CIST
Root ID : 32768. b0:c6:9a:6a:72:80 < SW3 is the CIST Root Bridge
Root cost : 0
Root port : ge-0/0/1.0
CIST regional root : 32768.b0:c6:9a:6a:72:80
CIST internal root cost : 20000
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Message age : 0
Number of topology changes : 2
Time since last topology change : 65 seconds
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32768. b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 0

STP bridge parameters for MSTI 1
MSTI regional root : 32769. b0:c6:9a:6a:72:80 < SW3 is the MSTP Root Bridge for Instance 1
Root cost : 20000
Root port : ge-0/0/1.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 3
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32769. b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 1

STP bridge parameters for MSTI 2
MSTI regional root : 32770. b0:c6:9a:6a:72:80
Root cost : 20000
Root port : ge-0/0/1.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 3
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32770. b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 2

STP bridge parameters for MSTI 3
MSTI regional root : 32771. b0:c6:9a:6a:72:80
Root cost : 20000
Root port : ge-0/0/1.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 3
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:d1:00
Local parameters
Bridge ID : 32771. b0:c6:9a:d3:b1:80
Extended system ID : 0
Internal instance ID : 3

------------------------------------------------------------------------------------------

root@ SW2 > show spanning-tree bridge

STP bridge parameters
Context ID : 0
Enabled protocol : MSTP

STP bridge parameters for CIST
Root ID : 32768. b0:c6:9a:6a:72:80 < SW3 is the CIST Root Bridge
Root cost : 0
Root port : ge-0/0/1.0
CIST regional root : 32768.b0:c6:9a:6a:72:80
CIST internal root cost : 20000
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Message age : 0
Number of topology changes : 3
Time since last topology change : 80 seconds
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:72:81
Local parameters
Bridge ID : 32768. b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 0

STP bridge parameters for MSTI 1
MSTI regional root : 32769. b0:c6:9a:6a:72:80 < SW3 is the MSTP Root Bridge for Instance 1
Root cost : 20000
Root port : ge-0/0/1.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 3
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:72:81
Local parameters
Bridge ID : 32769. b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 1

STP bridge parameters for MSTI 2
MSTI regional root : 32770. b0:c6:9a:6a:72:80
Root cost : 20000
Root port : ge-0/0/1.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 3
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:72:81
Local parameters
Bridge ID : 32770. b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 2

STP bridge parameters for MSTI 3
MSTI regional root : 32771. b0:c6:9a:6a:72:80
Root cost : 20000
Root port : ge-0/0/1.0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Hop count : 19
Number of topology changes : 3
Topology change initiator : ge-0/0/1.0
Topology change last recvd. from : b0:c6:9a:6a:72:81
Local parameters
Bridge ID : 32771. b0:c6:9a:6a:d1:00
Extended system ID : 0
Internal instance ID : 3

------------------------------------------------------------------------------------------

root@ SW3 > show spanning-tree bridge

STP bridge parameters
Context ID : 0
Enabled protocol : MSTP

STP bridge parameters for CIST
Root ID : 32768. b0:c6:9a:6a:72:80 < Local Switch is the CIST Root Bridge
CIST regional root : 32768.b0:c6:9a:6a:72:80
CIST internal root cost : 0
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 2
Time since last topology change : 94 seconds
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:d3:b1:81
Local parameters
Bridge ID : 32768. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 0

STP bridge parameters for MSTI 1
MSTI regional root : 32769. b0:c6:9a:6a:72:80 < Local Switch is the MSTP Root Bridge for Instance 1
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 2
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:d3:b1:81
Local parameters
Bridge ID : 32769. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 1

STP bridge parameters for MSTI 2
MSTI regional root : 32770. b0:c6:9a:6a:72:80
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 2
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:d3:b1:81
Local parameters
Bridge ID : 32770. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 2

STP bridge parameters for MSTI 3
MSTI regional root : 32771. b0:c6:9a:6a:72:80
Hello time : 2 seconds
Maximum age : 20 seconds
Forward delay : 15 seconds
Number of topology changes : 2
Topology change initiator : ge-0/0/0.0
Topology change last recvd. from : b0:c6:9a:d3:b1:81
Local parameters
Bridge ID : 32771. b0:c6:9a:6a:72:80
Extended system ID : 0
Internal instance ID : 3
Verifying the status of the Spanning Tree interface :
root@ SW1 > show spanning-tree interface

Spanning tree interface parameters for instance 0

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32768.b0c69a6ad100 20000 BLK ALT
ge-0/0/1.0 128:514 128:513 32768.b0c69a6a7280 20000 FWD ROOT

Spanning tree interface parameters for instance 1

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32769.b0c69a6ad100 20000 BLK ALT
ge-0/0/1.0 128:514 128:513 32769.b0c69a6a7280 20000 FWD ROOT

Spanning tree interface parameters for instance 2

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32770.b0c69a6ad100 20000 BLK ALT
ge-0/0/1.0 128:514 128:513 32770.b0c69a6a7280 20000 FWD ROOT

Spanning tree interface parameters for instance 3

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32771.b0c69a6ad100 20000 BLK ALT
ge-0/0/1.0 128:514 128:513 32771.b0c69a6a7280 20000 FWD ROOT

------------------------------------------------------------------------------------------

root@ SW2 > show spanning-tree interface

Spanning tree interface parameters for instance 0

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32768.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32768.b0c69a6a7280 20000 FWD ROOT

Spanning tree interface parameters for instance 1

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32769.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32769.b0c69a6a7280 20000 FWD ROOT

Spanning tree interface parameters for instance 2

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32770.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32770.b0c69a6a7280 20000 FWD ROOT

Spanning tree interface parameters for instance 3

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32771.b0c69a6ad100 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32771.b0c69a6a7280 20000 FWD ROOT

------------------------------------------------------------------------------------------

root@ SW3 > show spanning-tree interface

Spanning tree interface parameters for instance 0

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32768.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32768.b0c69a6a7280 20000 FWD DESG

Spanning tree interface parameters for instance 1

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32769.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32769.b0c69a6a7280 20000 FWD DESG

Spanning tree interface parameters for instance 2

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32770.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32770.b0c69a6a7280 20000 FWD DESG

Spanning tree interface parameters for instance 3

Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/0.0 128:513 128:513 32771.b0c69a6a7280 20000 FWD DESG
ge-0/0/1.0 128:514 128:514 32771.b0c69a6a7280 20000 FWD DESG

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