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Dell SmartFabric OS10 User Guide Release 10.5.3

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MSTP configuration

When you enable Multiple Spanning Tree Protocol (MSTP) on VLT nodes, configure both VLT peer nodes in the same MST region to avoid network loops. Ensure that the VLAN-to-instance mappings, region name, and revision ID are the same on both VLT peer nodes.

NOTE: OS10 supports a maximum of 64 MST instances.

To configure MSTP over VLT, follow these steps on both VLT peer nodes:

  1. Enable MSTP.
    CONFIGURATION mode
    spanning-tree mode mst
  2. Enter MST configuration mode.
    CONFIGURATION mode
    spanning tree mst configuration
  3. Create an MST instance and add multiple VLANs as required.
    MULTIPLE-SPANNING-TREE
    instance instance-number vlan from-vlan-id — to-vlan-id
  4. Configure the MST revision number, from 0 to 65535.
    MULTIPLE-SPANNING-TREE
    revision revision-number
  5. Configure the MST region name.
    MULTIPLE-SPANNING-TREE
    name name-string
The following example shows that both VLT nodes are configured with the same MST VLAN-to-instance mapping.
VLT Peer 1 confoguration
OS10(config)# spanning-tree mode mst
OS10(config)# spanning-tree mst configuration
OS10(conf-mst)# instance 1 vlan 2-10
OS10(conf-mst)# revision 10
OS10(conf-mst)# name ExampleMSTregion

VLT Peer 2 confoguration
OS10(config)# spanning-tree mode mst
OS10(config)# spanning-tree mst configuration
OS10(conf-mst)# instance 1 vlan 2-10
OS10(conf-mst)# revision 10
OS10(conf-mst)# name ExampleMSTregion

The following example shows MSTP information on VLTi:

NOTE: To view all the other ports, use the show spanning-tree active or show spanning-tree msti command.
OS10# show spanning-tree virtual-interface 
VFP(VirtualFabricPort) of MSTI 0 is Designated Forwarding
Edge port: No (default)
Link type: point-to-point (auto)
Boundary: Yes, Bpdu-filter: Disable, Bpdu-Guard: Disable, Shutdown-on-Bpdu-Guard-violation: No
Root-Guard: Disable, Loop-Guard: Disable
Bpdus (MRecords) Sent: 387, Received: 16
Interface                                                                       Designated
Name                PortID    Prio      Cost      Sts         Cost      Bridge ID                PortID  
---------------------------------------------------------------------------------------------------VFP(VirtualFabricPort) 0.1     0         1         FWD         0         32768    3417.ebf2.a8c4  0.1   

VLT-LAG -1(vlt-portid-1) of MSTI 0 is in Designated Forwarding
Edge port: No (default)
Link type: point-to-point (auto)
Boundary: No, Bpdu-filter: Disable, Bpdu-Guard: Disable, 
Shutdown-on-Bpdu-Guard-violation: No
Root-Guard: Disable, Loop-Guard: Disable
Bpdus (MRecords) Sent: 1234, Received: 123

Virtual
Interface                                                          Designated
Name              PortID    Prio      Cost      Sts         Cost    Bridge ID                PortID  
---------------------------------------------------------------------------------------------------

VLT-LAG -1(vlt-portid1)         128.2001  128       2000000   FWD         0       32768    90b1.1cf4.a523  128.2001
NOTE: To view all other ports, use the show spanning-tree active command.

The following example shows MSTP information on VLTi in detail:

OS10# show spanning-tree virtual-interface detail
Port 1 (VFP(VirtualFabricPort)) of MSTI 0 is designated Forwarding
Port path cost 0, Port priority 128, Port Identifier 128.1
Designated root priority: 32768, address: 34:17:44:55:66:7f
Designated bridge priority: 32768, address: 90:b1:1c:f4:a5:23
Designated port ID: 128.1, designated path cost: 0
Number of transitions to forwarding state: 1
Edge port: No (default)
Link Type: Point-to-Point
BPDU Sent: 2714, Received: 1234

Port 2001 (VLT-LAG -1(vlt-portid-1)) of MSTI 0 is designated Forwarding
Port path cost 200000, Port priority 128, Port Identifier 128.2001
Designated root priority: 32768, address: 34:17:44:55:66:7f
Designated bridge priority: 32768, address: 90:b1:1c:f4:a5:23
Designated port ID: 128.2001, designated path cost: 0
Number of transitions to forwarding state: 1
Edge port: No (default)
Link Type: Point-to-Point
BPDU Sent: 2714, Received: 1234

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