Configuring Priority Queuing

Configuring Priority Queuing

• Configure priority lists
• Configure classification
• Select a queue
• Set maximum queue size
• Apply the priority list to outbound traffic on an interface

Priority Queuing Classification

• Selects the queue based on Layer-3 protocol
• Additional classification (queue-keyword):
• fragment (IP packets with non-zero fragment offset)
• gt/lt : based on packet size (including L2 frame)
• list : ACL classification
• tcp/udp
  : TCP or UDP port number
• System and link-level messages are classified in queue high by default

• Router(config)#

• priority-list list-number protocol protocol-name {high|medium|normal|low} queue-keyword keyword-value

Priority Queuing Classification (cont.)

• Router(config)#

• Router(config)#

• Classifies all unclassified packets in a default queue

• Classifies the packet based on incoming interface

• priority-list list-number interface intf {high|medium|normal|low}

• priority-list list-number default {high|medium|normal|low}

Priority Queuing Scheduling and Dropping Parameters

• Router(config)#

• priority-list list-number queue-limit high medium normal low

• Specifies the maximum queue size of individual priority queues

• Assigns priority queuing definition to an interface

• Router(config-if)#

• priority-group list