Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

Page: 350 / 398

host1# show qos queue-thresholds egress-slot 9 region 7
region 7 (28MB - 32MB) oversubscription 80%
total
exceeded conformed committed queue committed
queue-profile length length length count memory
------------- -------- --------- --------- ----- ---------
default 896 1792 3456 2000 6912000
video 896 1792 3456 2000 6912000
multicast 896 1792 3456 2000 6912000
internet 896 1792 3456 2000 6912000
Region 7 has 2000 IP users, each with four queues. Each of the four queues use
default queue profiles.
To display the queue thresholds in the multicast queue profile:
host1# show qos queue-thresholds egress-slot 9 queue-profile multicast
queue-profile multicast 2000 queues
total
egress exceeded conformed committed committed
region memory length length length memory
------ ----------- -------- --------- --------- ---------
0 0MB - 4MB 5120 10112 20096 40192000
1 4MB - 8MB 5120 10112 20096 40192000
2 8MB - 12MB 5120 10112 20096 40192000
3 12MB - 16MB 5120 10112 20096 40192000
4 16MB - 20MB 5120 10112 20096 40192000
5 20MB - 24MB 1280 2560 10112 20224000
6 24MB - 28MB 1152 2176 4224 8448000
7 28MB - 32MB 896 1792 3456 6912000
The multicast queue profile is configured with a committed length of 10,000 minimum
and 20,000 maximum. When in regions 0–4, these queues would normally get more
memory than the 20,000 byte maximum requested. In this case, the queue is limited
to the maximum, and any excess memory is redistributed to other queues. Region
5 does not have enough memory to honor the 20,000-byte maximum requested.
Although a 20,000 byte maximum was requested, the router provisions memory in
128 byte blocks, rounded up or down per each request; 20,096 bytes is 157 blocks
of 128 bytes.
In region 6, memory is strictly partitioned, and neither the minimum nor maximum
request is honored. Instead, each multicast queue is given a fair share of the queue
length so that aggressive bandwidth consumers cannot starve out moderate traffic
consumers.
In region 7, memory is underprovisioned to allow queues to drain and to avoid
starvation that occurs when egress buffer memory fills completely.
To display the queue thresholds for video queues:
host1# show qos queue-thresholds egress-slot 9 region 0
region 0 (0MB - 4MB) oversubscription 3330%
total
exceeded conformed committed queue committed
queue-profile length length length count memory
------------- -------- --------- --------- ----- ---------
default 33664 67328 134656 2000 269312000
video 67328 134656 269184 2000 538368000
318 ■
Monitoring Queue Thresholds
JUNOSe 11.1.x Quality of Service Configuration Guide