Chapter 20: Rapid Spanning Tree Protocol (RSTP) Commands
366 Section III: Layer 2 Switching
maxage
Specifies the length of time, in seconds, after which stored bridge
protocol data units (BPDUs) are deleted by the bridge. All bridges
in a bridged LAN use this aging time to test the age of stored
configuration messages called bridge protocol data units (BPDUs).
For example, if you use the default value of 20, all bridges delete
current configuration messages after 20 seconds. The range of
this parameter is 6 to 40 seconds. The default is 20 seconds.
The value for the maxage parameter must be greater than
(2 x (hellotime +1)) and less than (2 x (forwarddelay -1)).
hellotime
Specifies the time interval between generating and sending
configuration messages by the bridge. This parameter can be from
1 to 10 seconds. The default is 2 seconds.
forwarddelay
Specifies the waiting period before a bridge changes to a new
state, for example, becomes the new root bridge after the topology
changes. If the bridge transitions too soon, not all links may have
yet adapted to the change, resulting in network loops. The range is
4 to 30 seconds. The default is 15 seconds. This parameter effects
only those ports operating in the STP compatible mode.
default
Returns all bridge and port RSTP settings to the default values.
This parameter cannot be used with any other command
parameter and only when RSTP is disabled. (This parameter
performs the same function as the PURGE STP command.)
Description
This command configures the following RSTP parameter settings.
Bridge priority
Hello time
Forwarding delay
Maximum age time
Force version of STP or normal RSTP
This command can also return the RSTP parameters to their default
settings.
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