Dell Force10 MXL Blade - Page 451

Per-VLAN Spanning Tree Plus (PVST+) | 451
extend system-id
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 a 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
Figure 24-1. Command Example
Related
Commands
Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module
FTOS(conf-pvst)#do show spanning-tree pvst vlan 2 brief
VLAN 2
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 001e.c9f1.00f3
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 001e.c9f1.00f3
We are the root of Vlan 2
Configured hello time 2, max age 20, forward delay 15
Bpdu filter disabled globally
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID
PortID
---------- -------- ---- ------ ----------- -------
-------------------- --------
Po 23 128.24 128 1600 FWD 0 32768
001e.c9f1.00f3 128.24
Te 5/41 128.450 128 2000 DIS 0 32768
001e.c9f1.00f3 128.450
Te 5/50 128.459 128 2000 FWD 0 32768
001e.c9f1.00f3 128.459
Interface
Name Role PortID Prio Cost Sts Cost Link-type
Edge BpduFilter
---------- ------ -------- ---- ------- ----------- ------- ---------
---- ----------
Po 23 Desg 128.24 128 1600 FWD 0 P2P No
No
Te 5/41 Dis 128.450 128 2000 DIS 0 P2P No
No
Te 5/50 Desg 128.459 128 2000 FWD 0 P2P No
No
protocol spanning-tree pvst Enter SPANNING TREE mode on the switch.