Dell Force10 TeraScale E Series - Page 1167

Per-VLAN Spanning Tree plus (PVST+) | 1167
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
History
Example
FTOS(conf-pvst)#do show spanning-tree pvst vlan 5 brief
VLAN 5
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32773, Address 0001.e832.73f7
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32773 (priority 32768 sys-id-ext 5), Address 0001.e832.73f7
We are the root of Vlan 5
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
---------- -------- ---- ------ --- ------- -------------------- --------
Gi 0/10 128.140 128 200000 FWD 0 32773 0001.e832.73f7 128.140
Gi 0/12 128.142 128 200000 DIS 0 32773 0001.e832.73f7 128.142
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
---------- ------ -------- ---- ------- --- ------- --------- ------------------------
Gi 0/10 Desg 128.140 128 200000 FWD 0 P2P No
Gi 0/12 Dis 128.142 128 200000 DIS 0 P2P No
Related
Commands
Version 8.3.1.0 Introduced
protocol spanning-tree pvst Enter SPANNING TREE mode on the switch.