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extend system-id
c e s
Use Extend System ID to augment the Bridge ID with a VLAN ID so that PVST+ differentiate
between BPDUs for each VLAN. If for some reason on VLAN receives a BPDU meant for another
VLAN, PVST+ will then not detect a loop, and both ports can remain in forwarding state.
Syntax
extend system-id
Defaults
Disabled
Command Modes
PROTOCOL PVST
Command
Version 8.3.1.0
History
Example
FTOS(conf-pvst)#do show spanning-tree pvst vlan 5 brief
VLAN 5
Executing IEEE compatible Spanning Tree Protocol
Root ID
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID
We are the root of Vlan 5
Configured hello time 2, max age 20, forward delay 15
Interface
Name
---------- -------- ---- ------
Gi 0/10
Gi 0/12
Interface
Name
---------- ------ -------- ---- ------- --- ------- --------- ------------------------
Gi 0/10
Gi 0/12
Related
protocol spanning-tree pvst
Commands
Introduced
Priority 32773, Address 0001.e832.73f7
Priority 32773
(priority 32768 sys-id-ext 5), Address 0001.e832.73f7
PortID
Prio Cost
Sts Cost
--- ------- -------------------- --------
128.140
128
200000
FWD 0
128.142
128
200000
DIS 0
Role
PortID
Prio Cost
Desg
128.140
128
200000
Dis
128.142
128
200000
Enter SPANNING TREE mode on the switch.
Designated
Bridge ID
32773 0001.e832.73f7
32773 0001.e832.73f7
Sts Cost
Link-type Edge
FWD 0
P2P
No
DIS 0
P2P
No
Per-VLAN Spanning Tree plus (PVST+) | 1167
PortID
128.140
128.142
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