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104 Nortel Networks L2/3 Ethernet Switch Module for IBM Eserver BladeCenter
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 7-19 were 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