Enabling The Extended System Id - Cisco 7609 Configuration Manual
Cisco ios software configuration guide—12.1e
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Configuring STP
This example shows how to verify the configuration:
Router# show spanning-tree vlan 200
VLAN0200
Spanning tree enabled protocol ieee
Root ID
Bridge ID
Interface
---------------- ---- --- --------- -------- --------------------------------
Fa4/4
Fa4/5
Router#
Note
You must have at least one interface that is active in VLAN 200 to create a VLAN 200 spanning tree. In
this example, two interfaces are active in VLAN 200.
Enabling the Extended System ID
Note
The extended system ID is enabled permanently on chassis that support 64 MAC addresses.
You can enable the extended system ID on chassis that support 1024 MAC addresses (see the
"Understanding the Bridge ID" section on page
To enable the extended system ID, perform this task:
Command
Step 1
Router(config)# spanning-tree extend system-id
Router(config)# no spanning-tree extend system-id
Step 2
Router(config)# end
Step 3
Router# show spanning-tree vlan vlan_ID
When you enable or disable the extended system ID, the bridge IDs of all active STP instances are
Note
updated, which might change the spanning tree topology.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
15-24
Priority
32768
Address
00d0.00b8.14c8
This bridge is the root
Hello Time
2 sec
Max Age 20 sec
Priority
32768
Address
00d0.00b8.14c8
Hello Time
2 sec
Max Age 20 sec
Aging Time 300
Role Sts Cost
Desg FWD 200000
Back BLK 200000
Chapter 15
Forward Delay 15 sec
Forward Delay 15 sec
Prio.Nbr Status
128.196
P2p
128.197
P2p
15-3).
Purpose
Enables the extended system ID.
Disables the extended system ID.
Note
You cannot disable the extended system ID on
chassis that support 64 MAC addresses or when
you have configured extended range VLANs (see
"STP Default Configuration" section on
page
15-21).
Exits configuration mode.
Verifies the configuration.
Configuring STP and IEEE 802.1s MST
78-14064-04
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Troubleshooting
