3Com Switch 7750 Configuration Guide

Configuring Bidirectional CAR 679
<SW7750> system-view
[SW7750] acl number 2000
[SW7750-acl-basic-2000] rule permit source 10.1.1.1 0.0.0.255
[SW7750-acl-basic-2000] quit
[SW7750] interface Ethernet 2/0/1
[SW7750-Ethernet2/0/1] qos
[SW7750-qoss-Ethernet2/0/1] traffic-bandwidth outbound ip-group 2000 64 128 50
Configuring
Bidirectional CAR
You can enable or disable bidirectional CAR.
With bidirectional CAR enabled, the switch considers an ACL rule applied to
different ports as different rules. As a result, an applied rule can occupy multiple
entries. If you enable CAR for traffic matching a certain rule on multiple ports, the
switch provides the specified bandwidth for the traffic matching the CAR rule on a
per-port basis.
With bidirectional CAR disabled, the switch considers an ACL rule applied to
different ports as the same rule. As a result, an applied rule occupies only one
entry. If you enable CAR for traffic matching a certain rule on multiple ports, the
switch provides the specified bandwidth for all the traffic matching the CAR rule
on these ports to share.
Suppose you want to allocate 2 Mbps of CAR bandwidth for the incoming traffic
matching ACL rule 0 and enable CAR on two ports with the traffic-limit
command.
■ If bidirectional CAR is enabled, each port guarantees 2 Mbps of bandwidth for
its incoming traffic matching ACL rule 0.
■ If bidirectional CAR is disabled, the switch guarantees 2 Mbps of bandwidth for
the traffic matching ACL rule 0 received on the two ports.
Configuration Procedure
n
This command applies to only type-A I/O Modules. To make the configuration take
effect, reboot the switch.
Configuration Example
■ Enable bidirectional CAR
Configuration procedure:
<SW7750> system-view
[SW7750] inboundcar enable
Configuring
Traffic-Based Selective
QinQ
QinQ is to encapsulate the VLAN tags of the private network in the VLAN tags of
the public network in order that the packets are transmitted through the
backbone network of the carrier (also called public network). The traffic-based
Table 550 Configure bidirectional CAR
Operation Command Description
Enter system view system-view -
Enable or disable bidirectional
CAR
inboundcar { enable |
disable }
Required
Disabled by default.