Switch 7700 Command reference Guide, v2.0

314 CHAPTER 8: USING STP COMMANDS
Description
Using the stp timer hello command, you can configure hello time of the
switch. Using the
undo stp timer hello command, you can restore the default
hello time.
The Ethernet switch transmits RSTP packets every hello time. The longer hello time
can ease the load of the switch, but it will also affect the performances of RSTP.
The stp timer hello command can be used to modify the value of hello time.
The default value is recommended.
Related commands: stp timer forward-delay, stp timer max-age, stp
transit-limit
.
Example
Set the hello time of the switch to 300 centiseconds.
[SW7700]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
Using the stp timer max-age command, you can configure the Max Age of the
switch. Using the
undo stp timer max-age command, you can 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Maximum age is used for judging if an RSTP packet is outdated.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 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. You can use this command to modify the maximum age in
accordance with the real cases. The default value, 2000, is recommended.
Related commands: stp timer forward-delay, stp timer hello.
Example
Set the Max Age of the switch to 1000 centiseconds.
[SW7700]stp timer max-age 1000
stp transit-limit Syntax
stp transit-limit packetnum
undo stp transit-limit