Table of Contents
Advertisement
19 Spanning Tree Protocol
(4) Setting status transition times
For timer-based operation in PVST+ mode or Rapid PVST+ mode, the port status
transitions at a fixed time interval. For the PVST+ mode, it transitions from Blocking to
Listening, Learning, and then Forwarding, and for the Rapid PVST+ mode, it transitions
from Discarding to Learning and then Forwarding. The time required for these status
transitions can be set. A small value can be set to transition more quickly to the Forwarding
status.
Points to note
If no value is set, 15 seconds is used for the status transition time. When changing
this parameter to a shorter time, make sure that the relationship between the BPDU
maximum enabled time (max-age) and sending interval (hello-time) satisfies the
following: 2 x (forward-time - 1) ≥ max-age ≥2 x (hello-time + 1).
Command examples
1.
(config)# spanning-tree vlan 10 forward-time 10
Sets the status transition time to 10 seconds for the VLAN 10 PVST+.
314
Advertisement
Table of Contents
