Ethernet Switches & Routers

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Occasional Contributor
Posts: 15
Registered: ‎09-01-2011

Spanning-Tree Root

Hey All,

Still getting used to Brocade and I must be doing something really dumb but I can't figure out what.  I have two MLXes and have a couple fo vlans between the two with spanning-tree is enabled.  But looking at the spanning-tree details, it looks like both switches are root.  Am I reading this wrong?  Thanks.

Config:

spanning-tree

!

!

vlan 1 name DEFAULT-VLAN

no spanning-tree

!

vlan 210 name User-MOV4

tagged ethe 6/1 ethe 6/23 to 6/24

router-interface ve 210

!

vlan 211 name User-MOV5

tagged ethe 6/1 ethe 6/23 to 6/24

router-interface ve 211

!

Switch 1:

MOV4-MLX-RC01#sh spanning-tree vlan 210

VLAN 210 - STP instance 0

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

STP Bridge Parameters:

Bridge           Bridge Bridge Bridge Hold  LastTopology Topology

Identifier       MaxAge Hello  FwdDly Time  Change       Change

hex              sec    sec    sec    sec   sec          cnt

80000024388cd100 20     2      15     1     839          1     

RootBridge       RootPath  DesignatedBridge Root  Max Hel Fwd

Identifier       Cost      Identifier       Port  Age lo  Dly

hex                        hex                    sec sec sec

80000024388cd100 0         80000024388cd100 Root  20  2   15

STP Port Parameters:

Port  Prio Path      State      Designat- Designated       Designated

Num   rity Cost                 ed Cost   Root             Bridge

6/1   128  4         DISABLED   0         0000000000000000 0000000000000000

6/2   128  4         DISABLED   0         0000000000000000 0000000000000000

6/24  128  4         FORWARDING 0         80000024388cd100 80000024388cd100

MOV4-MLX-RC01#sh spanning-tree vlan 211

VLAN 211 - STP instance 1

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

STP Bridge Parameters:

Bridge           Bridge Bridge Bridge Hold  LastTopology Topology

Identifier       MaxAge Hello  FwdDly Time  Change       Change

hex              sec    sec    sec    sec   sec          cnt

80000024388cd101 20     2      15     1     844          1     

RootBridge       RootPath  DesignatedBridge Root  Max Hel Fwd

Identifier       Cost      Identifier       Port  Age lo  Dly

hex                        hex                    sec sec sec

80000024388cd101 0         80000024388cd101 Root  20  2   15

STP Port Parameters:

Port  Prio Path      State      Designat- Designated       Designated

Num   rity Cost                 ed Cost   Root             Bridge

6/1   128  4         DISABLED   0         0000000000000000 0000000000000000

6/2   128  4         DISABLED   0         0000000000000000 0000000000000000

6/24  128  4         FORWARDING 0         80000024388cd101 80000024388cd101

MOV4-MLX-RC01#

Switch 2:

MOV4-MLX-RC02#sh spanning-tree vlan 210

VLAN 210 - STP instance 0

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

STP Bridge Parameters:

Bridge           Bridge Bridge Bridge Hold  LastTopology Topology

Identifier       MaxAge Hello  FwdDly Time  Change       Change

hex              sec    sec    sec    sec   sec          cnt

80000024388d2700 20     2      15     1     0            0     

RootBridge       RootPath  DesignatedBridge Root  Max Hel Fwd

Identifier       Cost      Identifier       Port  Age lo  Dly

hex                        hex                    sec sec sec

80000024388d2700 0         80000024388d2700 Root  20  2   15

STP Port Parameters:

Port  Prio Path      State      Designat- Designated       Designated

Num   rity Cost                 ed Cost   Root             Bridge

6/1   128  4         DISABLED   0         0000000000000000 0000000000000000

6/24  128  4         FORWARDING 0         80000024388d2700 80000024388d2700

MOV4-MLX-RC02#sh sp

  spanning-tree                 show STP information

MOV4-MLX-RC02#sh spanning-tree vlan 211

VLAN 211 - STP instance 1

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

STP Bridge Parameters:

Bridge           Bridge Bridge Bridge Hold  LastTopology Topology

Identifier       MaxAge Hello  FwdDly Time  Change       Change

hex              sec    sec    sec    sec   sec          cnt

80000024388d2701 20     2      15     1     0            0     

RootBridge       RootPath  DesignatedBridge Root  Max Hel Fwd

Identifier       Cost      Identifier       Port  Age lo  Dly

hex                        hex                    sec sec sec

80000024388d2701 0         80000024388d2701 Root  20  2   15

STP Port Parameters:

Port  Prio Path      State      Designat- Designated       Designated

Num   rity Cost                 ed Cost   Root             Bridge

6/1   128  4         DISABLED   0         0000000000000000 0000000000000000

6/24  128  4         FORWARDING 0         80000024388d2701 80000024388d2701

MOV4-MLX-RC02#

Occasional Contributor
Posts: 15
Registered: ‎09-01-2011

Re: Spanning-Tree Root

Figured out the issue.  I was missing the "no route-only" on one of the routers.  It is working as expected now.

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