Bridge Stp Max-Age; Bridge Stp Priority - 3Com 3C13618 Command Reference Manual

3Com Router Command Reference Guide — V1.00

8.1.11 bridge stp max-age

Syntax
bridge stp max-age seconds
undo bridge stp max-age
View
System view
Parameter
seconds
default, the value of the Max Age timer is 20 seconds.
Description
Using the bridge stp max-age command, you can configure the value of the Max Age
timer in the bridge information. Using the undo bridge stp max-age command, you
can restore the default value of the Max Age timer.
Max Age is the parameter used to judge whether the BPDUs have "timed out". Users
can configure it according to the actual network condition. Upon the interface enabling
STP, the Max Age timer begins to time. If the bridge have not received any BPDU in a
specified time, it will assume that the link has failed and the STP will regenerate the
topology.
When configuring the Max Age timer, it should be noted that:
Regardless of their configurations, all the bridges in the spanning tree should use
the value of the Max Age timer of root Bridge.
Too short a Max Age will result in frequent computations of spanning tree and
mistaking the network congestion for link fault. On the other hand, too long a Max
Age may make the bridge unable to find link faults promptly and lower the network
self-sensing ability. It is recommended that users use the default value.
Example
# Configure the value of the Max Age timer of bridge to 50 seconds.
[3Com]bridge stp max-age 50

8.1.12 bridge stp priority

Syntax
bridge stp priority value
undo bridge stp priority
150
Value of the Max Age timer of bridge, in the range of 6 to 40 seconds. By