Queuing Mechanisms Objectives

Sample PQ Configuration

• Core

• WAN Core

• Branch

• Office

• E0

• E1

• interface serial0
• priority-group 1
• priority-list 1 protocol ip high list 101
• priority-list 1 interface ethernet 0 medium
• priority-list 1 default normal
• priority-list 1 queue-limit 20 40 60 80
• access-list 101 permit tcp any any eq 23

Monitoring Priority Queuing

• show interface interface

• Router#

• Displays information and statistics about queuing on interface

• show queueing [priority|custom|fair|random-detect] interface

• Router#

• Displays queuing parameters on interface

• show queue interface

• Router#

• Displays queue contents

show interface

• Router#show interface serial 1/0
• Serial1/0 is up, line protocol is up
• Hardware is M4T
• Internet address is 20.0.0.1/8
• MTU 1500 bytes, BW 19 Kbit, DLY 20000 usec, rely 255/255, load 93/255
• 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: priority-list 1
• Output queue (queue priority: size/max/drops):
• high: 0/20/0, medium: 0/40/0, normal: 0/60/0, low: 0/80/0
• 5 minute input rate 18000 bits/sec, 8 packets/sec
• 5 minute output rate 7000 bits/sec, 8 packets/sec
• … rest ignored ...