3com 5500G ユーザーズマニュアル

C

HAPTER

 23: Q

O

S/Q

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S P

ROFILE

 C

ONFIGURATION

 G

UIDE

1 Define traffic classification rules

# Create basic ACL 2000 and enter basic ACL view.

<3Com> system-view

[3Com] acl number 2000 

# Define a rule to match the packets with source IP address 192.168.0.1.

[3Com-acl-basic-2000] rule permit source 192.168.0.1 0

[3Com-acl-basic-2000] quit 

2 Configure traffic policing and LR

# Limit the total outbound traffic rate of the marketing department and the R&D 
department to 16000 kbps, and drop the packets exceeding the rate limit.

[3Com] interface Ethernet 1/0/3

[3Com-Ethernet1/0/3] line-rate outbound 16000 

# Limit the rate of the IP packets that PC 1 of the R&D department sends out to 
8000 kbps, and drop the packets exceeding the rate limit.

[3Com] interface Ethernet 1/0/1

[3Com-Ethernet1/0/1] traffic-limit inbound ip-group 2000 8000 exceed drop 

#

acl number 2000

rule 0 permit source 192.168.0.1 0

#

interface Ethernet1/0/1

traffic-limit inbound ip-group 2000 rule 0 8000 exceed drop

#

interface Ethernet1/0/3

line-rate outbound 16000

# 

Note that:

■

The ACL rules configured for traffic classification must be permit statements.

■

If packets match ACL rules of multiple traffic policing actions, the traffic 
policing action issued the last takes effect.

■

The granularity of traffic policing and LR is 64 kbps. If the value you input is in 
the range of N

×64 to (N+1)×64 (N is a natural number), the switch sets the 

value to (N+1)

×64 kbps automatically.

■

Traffic policing or rate limiting just limits the traffic rate of payloads (excluding 
preambles and interframes).

■

When referencing an ACL for traffic policing, you must note that the action 
that traffic policing takes on conforming traffic is permit. If a packet matches a 
permit statement and a deny statement at the same time, the one issued the 
last takes effect. If the deny statement takes effect, no traffic policing action 
will be performed on the packet.