On the Cisco 3750, the sh spanning-tree mst <instance> command provides similar data as shown below. It is possible to tell that the connected ports on the GbESM and 3750 are successfully interoperating using MST because neither of the ports is displayed as being a boundary port. Boundary ports on switches running MSTP are ports that connect to switches running other, earlier versions of spanning tree such as RSTP or original 802.1D spanning tree. Connected ports which are parts of different MSTP regions also are boundaries, and this was observed in tests with earlier versions of Cisco firmware which did not fully support 802.1s.

Example 7-18 MSTP Information Display - Cisco

Switch#show spanning-tree mst 0

#####MST0 vlans mapped: 1-9,11-19,21-29,31-39,41-4094

Bridge address 0012.7fea.7600 priority 12288 (12288 sysid 0) Root this switch for the CIST

Operational hello time 2 , forward delay 15, max age 20, txholdcount 6 Configured hello time 2 , forward delay 15, max age 20, max hops 20

Interface

Role

Sts

Cost

Prio.Nbr

Type

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

Fa1/0/1

Desg

FWD

200000

128.3

P2p

##### MST1 vlans

mapped: 10,30

 

 

 

Bridge address 0012.7fea.7600 priority 4097 (4096 sysid 1)

Root this switch

for MST1

 

 

 

Interface

Role

Sts

Cost

Prio.Nbr

Type

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

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

Fa1/0/1

Desg

FWD

200000

128.3

P2p

##### MST2 vlans

mapped: 20,40

 

 

 

Bridge address 0012.7fea.7600 priority 8194 (8192 sysid 2)

Root this switch

for MST2

 

 

 

Interface

Role

Sts

Cost

Prio.Nbr

Type

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

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

Fa1/0/1

Desg

 

FWD

200000

128.3

P2p

 

 

 

 

 

 

 

Note that the configurations Example 7-19were done by Nortel teams in Santa Clara and not as part of the work of the team that performed the other tests which are documented in this Redpaper. Thus, the following configurations are not based on the configurations shown earlier. The key commands for MRST (802.1s) are shown in boldface.

This configuration creates two MRST instances, STG 1 for VLANS 10 and 30 and the other for VLANS 20 and 40. STG 16, which is used exclusively for the Management Module VLAN (4095) is also active by default. The STP region name is INTEROP.

Example 7-19 Sample MSTP Configuration - GbESM

script start "Layer 2-3 Gigabit Ethernet Switch Module for IBM eServer BladeCenter" 4 /**** DO NOT EDIT THIS LINE!

/* Configuration dump taken 0:05:23 Thu Jan 1, 2070 /* Version 1.0.1.6, Base MAC address 00:11:f9:38:1b:00 /c/port EXT1

tag ena /c/port EXT2 tag ena /c/l2/vlan 10 ena

104Nortel Networks L2/3 Ethernet Switch Module for IBM Eserver BladeCenter

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IBM L2/3 manual Example 7-18 Mstp Information Display Cisco, Example 7-19 Sample Mstp Configuration GbESM