Huawei v200r001 user manual II. Configuring priority queue

User Manual - Configuration Guide (Volume 3)	Chapter 3
Versatile Routing Platform	Congestion Management

II. Configuring priority queue

Priority queue includes the definition for a group of priority queues and it specifies in which queue a packet is placed and the maximum length of different priority queues.

To complete the queuing of a priority queue, you must allocate this list to the interface. The same priority queue can be applied to multiple interfaces. Certainly, you can create multiple different priority policies to be applied to different interfaces.

16 groups can be configured in the priority list at most (that is, the value range of the list-number is 1-16). In each group, the following information is specified: ￿what kind of packets enters what kind of queue, length of each queue, the number of the bytes that can be sent continuously from the respective queues in each polling, etc.

The priority queue can be defined as four levels: high, medium, normal and low. Packets will be forwarded by the level sequence. That is, after all the packets in the high queue are sent out, send all the packets in the medium queue, and then send all the packets in the normal queue, and at last send the packets in the low queue.

Priority queue can be configured according to the modes below.

1)Configure priority queue according to network layer protocols

Data packets can be classified according to different types of protocols to make them enter different priority queues.

Perform the following task in the global configuration mode.

Table QC-3-2Configure the priority queue according to the network layer protocol

Operation	Command
Configure the priority queue according to the	priority-list list-numberprotocol protocol-name{ high medium
network layer protocol	normal low } [ queue-keyword keyword-value ]
Delete classification policy in the priority	no priority-list list-numberprotocol protocol-name{ high
queues	medium normal low } [ queue-keyword keyword-value ]

No priority queue is established by default.

Here, list-numberis the group number of priority queue. protocol-nameis the name of the protocol, the value of which can be IP and IPX at present.

When protocol-name is IP, the value of queue-keyword and keyword-value is shown in the table below.

Table QC-3-3Value of queue-keyword and keyword-value in IP

queue-keyword	keyword-value	Meaning
Null	Null	If it is an IP packet, it enters the queue.
fragments	Null	If it is a fragmentary IP packet, it enters the priority queue
list	access-list-number	IP packet in compliance with a specific access-list-number(normal)
		definition enters the priority queue.
lt	Length Value	IP packet whose length is smaller than a count value enters the priority
		queue.
gt	Length Value	IP packet whose length is larger than a count value enters the priority queue.
tcp	Port No.	If the source of IP packet or destination TCP port number is the specified port
		number, the packet enters the queue.
udp	Port No.	If the source of IP packet or destination UDP port number is the specified
		port number, the packet enters the priority queue.

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