Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration Manual page 330

JunosE 11.3.x Quality of Service Configuration Guide
300
------------- --------
default 896
video 896
multicast 896
internet 896
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
egress exceeded
region memory length
------ ----------- --------
0 0MB - 4MB
1 4MB - 8MB
2 8MB - 12MB
3 12MB - 16MB
4 16MB - 20MB
5 20MB - 24MB
6 24MB - 28MB
7 28MB - 32MB
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%
exceeded
queue-profile length
------------- --------
default 33664
video 67328
multicast 5120
internet 33664
You can configure video queues with a buffer weight of 16 and Internet and multicast
queues with a buffer weight of 8 to ensure that video queues get to queue twice as much
traffic as Internet and multicast queues.
--------- --------- -----
1792 3456 2000
1792 3456 2000
1792 3456 2000
1792 3456 2000
conformed committed
length length
--------- ---------
5120 10112 20096
5120 10112 20096
5120 10112 20096
5120 10112 20096
5120 10112 20096
1280 2560 10112
1152 2176 4224
896 1792 3456
conformed committed queue
length length count
--------- --------- -----
67328 134656 2000
134656 269184 2000
10112 20096 2000
67328 134656 2000
---------
6912000
6912000
6912000
6912000
total
committed
memory
---------
40192000
40192000
40192000
40192000
40192000
20224000
8448000
6912000
total
committed
memory
---------
269312000
538368000
40192000
269312000
Copyright © 2010, Juniper Networks, Inc.