Mapping And Unmapping Vlans To An Mst Instance - Cisco WS-C2948G-GE-TX Configuration Manual

Configuring MST
Bridge ID MAC ADDR
Bridge ID Priority
2)
Port
------------------------ ------------- ---- -------- -----------------------
6/1
Boundary(PVST)
6/2
Boundary(PVST)
Console> (enable)

Mapping and Unmapping VLANs to an MST Instance

See
Note
By default, all VLANS are mapped to IST (instance 0). For an MST instance (MSTI) 1 through 15 to be
active, you must map at least one VLAN to that MSTI. IST will always be active whether VLANs are
mapped to IST or not. There are no VLAN mapping conflicts because of separate regions in MST.
Follow these guidelines for mapping and unmapping VLANS to an MST instance:
•
•
•
•
•
To map a VLAN to an MST instance, perform this task in privileged mode:
Task
Step 1 Map a VLAN to an MST instance.
Step 2
Make the new region mapping effective.
Step 3
Verify that the VLAN is mapped.
This example shows how to map a VLAN to MST instance 1 and verify the mapping:
Console> (enable) show spantree mst config
Current (NVRAM) MST Region Configuration:
Configuration Name:cisco
Instance VLANs
-------- --------------------------------------------------------------
IST
1
2
3
4
5
6
7
8
9
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
7-54
State
forwarding
blocking
Chapter 10, "Configuring VLANs"
You can only map Ethernet VLANs to MST instances.
At least one VLAN in the instance must have an active port in order for MST to be active.
You can map as many Ethernet VLANs as you wish to an MST instance.
You cannot map a VLAN to more than one MST instance.
The Hello Time, Maximum Age timer, and Forward Delay timer set for mode and all spanning trees
are used globally by MST.
1,51-4094
2-20
21-30
31-40
41-50
-
-
-
-
-
00-10-7b-bb-2f-00
32770 (bridge priority:32768, sys ID ext:
Role Cost
BDRY 10000
BDRY 20000
for details on using VLANs.
Command
set spantree mst instance vlan vlan
set spantree mst config commit
show spantree mst [instance] [active] mod/port
Chapter 7 Configuring Spanning Tree
Prio Type
20 P2P,
32 P2P,
Revision:1
78-15908-01