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FTOS Configuration Guide for the C-Series - Force10 Networks

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Create an MSTI using <strong>the</strong> command msti from PROTOCOL MSTP mode. Specify <strong>the</strong> keyword vlan<br />

followed by <strong>the</strong> VLANs that you want to participate in <strong>the</strong> MSTI, as shown in Figure 302.<br />

Figure 302 Mapping VLANs to MSTI Instances<br />

R1(conf)#protocol spanning-tree mstp<br />

R1(conf-mstp)#msti 1 vlan 100<br />

R1(conf-mstp)#msti 2 vlan 200-300<br />

R1(conf-mstp)#show config<br />

!<br />

protocol spanning-tree mstp<br />

no disable<br />

MSTI 1 VLAN 100<br />

MSTI 2 VLAN 200-300<br />

All bridges in <strong>the</strong> MSTP region must have <strong>the</strong> same VLAN-to-instance mapping. View to which instance a<br />

VLAN is mapped using <strong>the</strong> command show spanning-tree mst vlan from EXEC Privilege mode, as<br />

shown in Figure 305.<br />

View <strong>the</strong> <strong>for</strong>warding/discarding state of <strong>the</strong> ports participating in an MSTI using <strong>the</strong> command show<br />

spanning-tree msti from EXEC Privilege mode, as shown in Figure 303.<br />

Figure 303 Viewing MSTP Port States<br />

R1#show spanning-tree msti 1<br />

MSTI 1 VLANs mapped 100<br />

Root Identifier has priority 32768, Address 0001.e806.953e<br />

Root Bridge hello time 2, max age 20, <strong>for</strong>ward delay 15, max hops 19<br />

Bridge Identifier has priority 32768, Address 0001.e80d.b6d6<br />

Configured hello time 2, max age 20, <strong>for</strong>ward delay 15, max hops 20<br />

Current root has priority 32768, Address 0001.e806.953e<br />

Number of topology changes 2, last change occured 1d2h ago on Gi 1/21<br />

Port 374 (GigabitE<strong>the</strong>rnet 1/21) is root Forwarding<br />

Port path cost 20000, Port priority 128, Port Identifier 128.374<br />

Designated root has priority 32768, address 0001.e806.953e<br />

Designated bridge has priority 32768, address 0001.e806.953e<br />

Designated port id is 128.374, designated path cost 20000<br />

Number of transitions to <strong>for</strong>warding state 1<br />

BPDU (MRecords): sent 93671, received 46843<br />

The port is not in <strong>the</strong> Edge port mode<br />

Port 384 (GigabitE<strong>the</strong>rnet 1/31) is alternate Discarding<br />

Port path cost 20000, Port priority 128, Port Identifier 128.384<br />

Designated root has priority 32768, address 0001.e806.953e<br />

Designated bridge has priority 32768, address 0001.e809.c24a<br />

Designated port id is 128.384, designated path cost 20000<br />

Number of transitions to <strong>for</strong>warding state 1<br />

BPDU (MRecords): sent 39291, received 7547<br />

The port is not in <strong>the</strong> Edge port mode<br />

422 Multiple Spanning Tree Protocol

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