3Com Switch 8800 Family Configuration Guide

VPLS Basic Configuration 645
By default, the VPN rate limitation is 102,400 kbps.
Configuring VPN broadcast suppression percentage
Use the broadcast-restrain command to configure the VPN broadcast
suppression percentage, which is in the range of 0 to 100. You cannot set the
percentage to 0. In the VSI, the part of broadcast traffic (including broadcast,
multicast, and unknown unicast) beyond the suppression percentage is discarded.
Perform the following configuration in VSI view.
By default, VPN broadcast suppression percentage is 5%.
Configuring packet MTU
Use the mtu command to specify the maximum transmission unit (MTU) value for
user access packets of this VPLS instance, which is in the range of 128 to 8,192.
This MTU value is also the MTU value for PW.
Perform the following configuration in VSI view.
By default, MTU is 1,500 Bytes.
Configuring CoS
Use the command to map user priority 802.1Q COS to PSN COS (PSN: Public
Switching Network; COS: Class Of Service). When configuring the CoS mapping
level, you can either use the CoS mapping table suggested by the protocol, or
define user priority for PSN CoS mapping. .
Perform the following configuration in VSI view.
The default CoS level is 0.
Configuring other VPLS characteristics
Perform the following configuration in the corresponding VSI views.
Tab le 586 Configure VPN broadcast suppression percentage
Operation Command
Configure VPN broadcast suppression percentage broadcast-restrain percent
Tab le 587 Configure packet MTU
Operation Command
Configure packet MTU for the VPLS instance mtu mtu
Restore the default MTU undo mtu
Tab le 588 Configure the CoS level
Operation Command
Configure the CoS level for the VSI cos { cos-value | user-define-table p p p p p p p p }