Switch 7700 Command reference Guide, v2.0

344 CHAPTER 8: USING STP COMMANDS
stp transit-limit Syntax
stp transit-limit packetnum
undo stp transit-limit
View
Ethernet port view
Parameter
packetnum: Specifies the amount limit to the transmitted packets, ranging from 1
to 255 (expressed as a counter value without any units). By default, the value is 3.
Description
■ Use the stp transit-limit command to configure an amount limit to the
configuration BPDU transmitted via a port during the Hello Time.
■ Use the undo stp transit-limit command to restore the default limit.
The larger the value is, the more packets can be transmitted in a time unit, yet the
more switch resources will be occupied. With a moderate value, the amount of the
BPDUs transmitted during Hello Time via every port can be limited and MSTP will
not occupy too many bandwidth resources when the network topology flaps.
Related command: stp interface transit-limit.
Example
Set a limit of 5 to the packets transmitted via Ethernet5/0/1.
[SW7700-Ethernet5/0/1]stp transit-limit 5
vlan-mapping modulo Syntax
vlan-mapping modulo modulo
View
MST region view
Parameter
modulo: Specifies the modulus, ranging from 1 to 16.
Description
Use the vlan-mapping modulo command to map a VLAN list to an STI.
By default, all the VLANs are mapped to CIST, namely Instance 0.
MSTP describes the association between VLANs and STIs with the VLAN mapping
table. You can use this command to configure this table. Every VLAN can be
mapped to an STI as per your configuration.
A VLAN cannot be mapped to different MSTI at the same time. The latter
configured association will replace the former one.
The vlan-mapping modulo modulo command designates VLAN for every STI fast.
It maps the VLAN to an STI whose ID is (VLAN ID-1)%modulo+1. (Note: (VLAN