Cisco IOS Cookbook, 2nd Edition

Using Custom Queues with Priority Queues

Problem

You want to combine Custom Queuing with Priority Queuing on an interface so the highest priority packets are always handled first, and lower priority traffic streams share bandwidth with one another.

Solution

You can split the queues so that some use Priority Queuing and the remainder Custom Queuing:

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#access-list 101 permit ip any any precedence 7
Router(config)#access-list 102 permit ip any any precedence 6
Router(config)#access-list 103 permit ip any any precedence 5
Router(config)#access-list 104 permit ip any any precedence 4
Router(config)#access-list 105 permit ip any any precedence 3
Router(config)#access-list 106 permit ip any any precedence 2
Router(config)#access-list 107 permit ip any any precedence 1
Router(config)#queue-list 1 protocol ip 1 list 101
Router(config)#queue-list 1 protocol ip 2 list 102
Router(config)#queue-list 1 protocol ip 3 list 103
Router(config)#queue-list 1 protocol ip 4 list 104
Router(config)#queue-list 1 protocol ip 5 list 105
Router(config)#queue-list 1 protocol ip 6 list 106
Router(config)#queue-list 1 protocol ip 7 list 107
Router(config)#queue-list 1 lowest-custom 4
Router(config)#interface HSSI0/0
Router(config-if)#custom-queue-list 1
Router(config-if)#exit
Router(config)#end
Router#

Discussion

This example is similar to Recipe 11.4, which looked at a pure Custom Queuing example. In this case, however, ...