3Com 4500 PWR 50-PORT, 4500 PWR 26-PORT manual Stp timer max-age Syntax, Stp transmit-limit Syntax

230CHAPTER 10: USING RSTP COMMANDS

Related commands: stp timer forward-delay,stp timer max-age,stp transmit-limit.

Example

To set the hello time of the Switch to 300 centiseconds, enter the following:

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]stp timer hello 300

stp timer max-age Syntax

stp timer max-age centiseconds

undo stp timer max-age

View

System View

Parameter

centiseconds: Specifies the maximum age in centiseconds, ranging from 600 to 4000. By default, the value is 2000 centiseconds.

Description

Use the stp timer max-agecommand to configure the Max Age of the Switch.

Use the undo stp timer max-agecommand to restore the default Max Age.

Maximum age is used for judging if an RSTP packet is outdated. If the value is set too small, the spanning tree will be computed too frequently because the network congestion may be considered as a link failure. However, if the value is set too large, the link failure may not be discovered in time. Maximum age is related to the network “diameter”, or complexity of the switched network. The default value, 2000, is recommended.

Related commands: stp timer forward-delay,stp timer hello.

Example

To set the Max Age of the Switch to 1000 centiseconds, enter the following:

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]stp timer max-age 1000

stp transmit-limit Syntax

stp transmit-limit packetnum

undo stp transmit-limit

View

Ethernet Port View