Weighted Fair Queuing Additional Parameters

Weighted Fair Queuing Additional Parameters

• hold-queue max-limit out

• Router(config-if)#

• Specifies the maximum number of packets that can be in all output queues on the interface at any time
• The default value for WFQ is 1000
• Under special circumstances WFQ can consume a lot of buffers, which may require lowering this limit

Fair Queuing Defaults

• Fair queuing is enabled by default on:
• Physical interfaces whose bandwidth is less than or equal to 2.048 Mbps
• Interfaces configured for Multilink PPP
• Fair queuing is disabled:
• If you enable the autonomous or silicon switching engine mechanisms
• For any sequenced encapsulation: X.25, SDLC, LAPB, reliable PPP

Monitoring and Troubleshooting WFQ

• show interface interface

• Router#

• Displays interface delays, including the activated queuing mechanism with the summary information

• show queue interface

• Router#

• Displays detailed information about the WFQ system of the selected interface

show interface

• Router#show interface serial 1/0
• Hardware is M4T
• Internet address is 20.0.0.1/8
• MTU 1500 bytes, BW 19 Kbit, DLY 20000 usec, rely 255/255, load 147/255
• Encapsulation HDLC, crc 16, loopback not set
• Keepalive set (10 sec)
• Last input 00:00:00, output 00:00:00, output hang never
• Last clearing of "show interface" counters never
• Input queue: 0/75/0 (size/max/drops); Total output drops: 0
• Queueing strategy: weighted fair
• Output queue: 0/1000/64/0 (size/max total/threshold/drops)
• Conversations 0/4/256 (active/max active/max total)
• Reserved Conversations 0/0 (allocated/max allocated)
• 5 minute input rate 18000 bits/sec, 8 packets/sec
• 5 minute output rate 11000 bits/sec, 9 packets/sec
• … rest deleted ...