Cisco WS-C6506 Software Manual page 184

Configuring MISTP-PVST+ or MISTP on the Switch
Follow these guidelines when mapping VLANs to an MISTP instance:
•
•
•
•
To use VLANs 1025–4094, you must enable MAC address reduction. See the
Note
VLANs" section on page 11-7
VLANs.
To map a VLAN to an MISTP instance, perform this task in privileged mode:
Task
Step 1 Map a VLAN to an MISTP instance.
Step 2 Verify the VLAN is mapped.
This example shows how to map a VLAN to MISTP instance 1 and verify the mapping:
Console> (enable) set vlan 6 mistp-instance 1
Vlan 6 configuration successful
Console> (enable) show spantree mist-instance 1
Instance 1
Spanning tree mode
Spanning tree type
Spanning tree instance enabled
Designated Root
Designated Root Priority
Designated Root Cost
Designated Root Port
VLANs mapped:
Root Max Age
Bridge ID MAC ADDR
Bridge ID Priority
VLANs mapped:
Bridge Max Age 20 sec
Port
------------------------ ---- ------------- --------- ---- -------- ----------
2/12
Determining MISTP Instances—VLAN Mapping Conflicts
A VLAN can only be mapped to one MISTP instance. If you attempt to map a VLAN to more than one
instance, all of its ports are set to blocking mode. You can use the show spantree conflicts command to
determine to which MISTP instances you have attempted to map the VLAN.
This command prints a list of the MISTP instances that are associated with the VLAN, the MAC
addresses of the root switches that are sending the BPDUs containing the VLAN mapping information,
and the timers that are associated with the mapping of a VLAN to an MISTP instance. When only one
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
7-42
You can map only Ethernet VLANs to MISTP instances.
At least one VLAN in the instance must have an active port in order for MISTP-PVST+ or MISTP
to be active.
You can map as many Ethernet VLANs as you wish to an MISTP instance.
You cannot map a VLAN to more than one MISTP instance.
20 sec Hello Time 2 sec
Hello Time 2 sec
Inst Port-State
1
in Chapter 11, "Configuring VLANs"
Command
set vlan vlan mistp-instance instance
show spantree mistp-instance [instance] [active]
mod/port
MISTP-PVST+
ieee
00-d0-00-4c-18-00
49153 (root priority: 49152, sys ID ext: 1)
0
none
6
Forward Delay 15 sec
00-d0-00-4c-18-00
49153 (bridge priority: 49152, sys ID ext: 1)
6
Forward Delay 15 sec
Cost
forwarding 22222222
Chapter 7 Configuring Spanning Tree
"Creating Extended-Range
for details on using extended-range
Prio Portfast Channel_id
40 disabled 0
OL-8978-04