3Com 4800G Series, Руководство по настройке

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866 C
HAPTER
66: T
RAFFIC
C
LASSIFICATION
, TP,
AND
LR C
ONFIGURATION
implement different regulation policies in different conditions, including “enough
tokens in C bucket”, “insufficient tokens in C bucket but enough tokens in E
bucket” and “insufficient tokens in both C bucket and E bucket”.
TP The typical application of TP is to supervise the specification of certain traffic into
the network and limit it within a reasonable range, or to “discipline” the extra
traffic. In this way, the network resources and the interests of the operators are
protected. For example, you can limit HTTP packets to be within 50% of the
network bandwidth. If the traffic of a certain connection is excess, TP can choose
to drop the packets or to reset the priority of the packets.
TP is widely used in policing the traffic into the network of internet service
providers (ISPs). TP can classify the policed traffic and perform pre-defined policing
actions based on different evaluation results. These actions include:
■
Forwarding conforming packets or non-conforming packets.
■
Dropping conforming or non-conforming packets.
■
Marking a conforming packet with a new 802.1p precedence value and
forwarding the packet.
■
Marking a conforming packet with a new IP precedence value and forwarding
the packet.
■
Marking a conforming packet or a non-conforming packet with a new DSCP
precedence value and forwarding the packet.
LR Port rate limiting refers to limiting the total rate of inbound or outbound packets
on a port.
Port rate limiting can be implemented through token buckets. That is, if you
perform port rate limiting configuration for a port, the token bucket determines
the way to process the packets to be sent by this port or packets reaching the
port. Packets can be sent or received if there are enough tokens in the token
bucket; otherwise, they will be dropped.
Compared to TP, port rate limiting applies to all the packets passing a port. It is a
simpler solution if you want to limit the rate of all the packets passing a port.
LR Configuration
LR Configuration
Procedure
Follow these steps to configure LR:
To do… Use the command… Remarks
Enter system view system-view -
Enter
interface
view or
port group
view Enter port
view interface interface-type
interface-number
Enter either view.
For Ethernet interface view, the
following configuration takes
effect only on the current
interface. For entering port
group view, the following
configuration takes effect on all
the ports.
Enter port
group view port-group { manual
port-group-name | aggregation
agg-id }