3Com Router User Manual

Configuring Congestion Management687
lengths of various queues, and the number of bytes that may be continuously 
transmitted by polling of every queue.
The priority queue may be configured according to the following methods:
1Configure the priority queue according to the network layer protocol
Based on packet length, TCP/UDP port number, whether or not matching ACL, 
you can classify data packets, so that they can enter the queues with different 
priority.
Perform the following configurations in system...

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By default, no priority queue is established.
3Configure the default priority-list queuing.
The data packets that are not matched with any policy in the priority queue (both 
protocol type and interface type are not matched) will be allocated to the default 
priority queue.
Please perform the following configurations in the system view.
Ta b l e 724   Configure the Default Priority-List Queuing
By default, no default priority queue is established.
Multiple policies...

Configuring Congestion Management689
queue-length is the queues lengths of the 4 priority levels. They range 1 to 1024 
packets.
The default length of each priority queue is shown in the following table:
Ta b l e 727   Default Length Value of the Priority Queue
Displaying and debugging the priority queue
Ta b l e 728   Display and Debug the Priority Queue
Configuring Custom 
Queuing (CQ)Custom queuing configuration includes:
■Configuring custom-list queuing
■Applying the custom-list queuing group to the...

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Configure the custom queue according to the network layer protocol 
The data packets can be classified according to different protocol types, and be 
input to different custom queues.
Perform the following configurations in the system view.
Ta b l e 729   Configure the Custom Queue According to the Network Layer Protocol
Among them, cql-index is the group number of the custom queue; queue-number 
is the queue number with the value ranging 0 to 16. protocol-name may be...

Configuring Congestion Management691
Applying the custom-list queuing group to the interface
To put the custom-list queue into operation, the configured custom-list queue 
must be applied to the specific interface. Every interface can only use one custom 
queue, but one custom queue can be applied to multiple interfaces. Multiple 
different custom queues may be established to apply to different interfaces.
Perform the following configurations in the interface view.
Ta b l e 732   Apply Custom-List...

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byte-count: When the router dispatches the user queue of CQ, it continuously 
extracts and sends the data packets from this queue, until the number of the 
transmitted bytes is not less than the byte-count value configured for this queue 
or the queue is empty, the next user queue of CQ is to be transmitted. Therefore, 
the byte-count value will affect the proportional relationship of the occupied 
interface bandwidth between various user queues of CQ, and determine...

Congestion Management Configuration Examples693
Congestion 
Management 
Configuration 
Examples
PQ Configuration
Example
1Define the access control table, and allow the packets from 10.10.0.0 network 
segment to pass through.
[Router]acl 1
[Router-acl-1]rule permit source 10.10.0.0
2Define one policy for the group 1 of the priority queue: The IP packet that meets 
the acl-number value being 1 is inputted into the queue with the priority level of 
top.
[Router] qos pql 1 protocol ip acl 1 queue top
3Set...

694CHAPTER 49: CONGESTION MANAGEMENT
Figure 222   Networking diagram of CQ typical configuration
1Configure Router A
[RouterA]acl 105
[RouterA-acl-105]rule normal permit ip source 10.1.4.0 0.0.0.255 
destination 10.1.5.0 0.0.0.255
[RouterA-acl-105] rule normal deny ip source any destination any
[RouterA-acl-105]acl 107
[RouterA-acl-107] rule normal permit ip source 192.168.0.2 0.0.0.0 
destination 192.168.0.1 0.0.0.0
[RouterA-acl-108]rule normal permit ip source 192.168.1.2 0.0.0.0 
destination...

Congestion Management Configuration Examples695
[RouterB-acl-105]rule normal permit ip source 10.1.5.0 0.0.0.255 
destination 10.1.4.0 0.0.0.255
[RouterB-acl-105] rule normal deny ip source any destination any
[RouterB-acl-105]acl 107
[RouterB-acl-107]rule normal permit ip source 192.168.0.1 0.0.0.0 
destination 192.168.0.2 0.0.0.0
[RouterB-acl-107]acl 108
[RouterB-acl-107]rule normal permit ip source 192.168.1.1 0.0.0.0 
destination 192.168.1.2 0.0.0.0
bConfigure the CQ queue
[RouterB] qos cql 1 queue 1...

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