01-16-2007 01:18 PM - edited 03-03-2019 03:23 PM
I have this QoS policy:
class-map match-all Video-Control1
match access-group name Video-Control1
class-map match-any Prec5
match ip precedence 5
match ip rtp 16384 16383
class-map match-all Video-RTP1
match access-group name Video-RTP1
class-map match-all VoIP-RTP1
match access-group name VoIP-RTP1
class-map match-any Patch-management
match access-group name patch-servers
class-map match-all VoIP-Control1
match access-group name VoIP-Control1
!
!
policy-map QoS-Policy1
class Video-Control1
priority percent 5
class Video-RTP1
bandwidth 420
class VoIP-RTP1
priority percent 40
class VoIP-Control1
bandwidth 30
class Patch-management
class class-default
fair-queue
set dscp default
ip access-list extended Video-Control1
deny ip any any fragments
permit tcp any any range 5555 5587 dscp cs6
permit tcp any any eq 1720 dscp cs6
ip access-list extended Video-RTP1
deny ip any any fragments
permit udp any any range 2326 2837 dscp cs4
ip access-list extended VoIP-Control1
deny ip any any fragments
permit tcp any any range 2000 2002 dscp af31
permit tcp any any eq 1720 dscp af31
permit tcp any any range 11000 11999 dscp af31
permit udp any any eq 2427 dscp af31
permit tcp any any eq 2428 dscp af31
permit tcp any any eq 2748
ip access-list extended VoIP-RTP1
deny ip any any fragments
permit udp any any range 16384 32768 dscp ef
ip access-list extended patch-servers
permit ip host 10.16.5.25 any
permit ip host 10.16.5.30 any
sh policy-map interface
Serial2/0/2:0
Service-policy output: QoS-Policy1
Class-map: Video-Control1 (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name Video-Control1
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 5 (%)
Bandwidth 76 (kbps) Burst 1900 (Bytes)
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
Class-map: Video-RTP1 (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name Video-RTP1
Queueing
Output Queue: Conversation 265
Bandwidth 420 (kbps)Max Threshold 64 (packets)
(pkts matched/bytes matched) 0/0
(depth/total drops/no-buffer drops) 0/0/0
Class-map: VoIP-RTP1 (match-all)
17515 packets, 1120960 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name VoIP-RTP1
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 40 (%)
Bandwidth 614 (kbps) Burst 15350 (Bytes)
(pkts matched/bytes matched) 684/43776
(total drops/bytes drops) 0/0
Class-map: VoIP-Control1 (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name VoIP-Control1
Queueing
Output Queue: Conversation 266
Bandwidth 30 (kbps)Max Threshold 64 (packets)
(pkts matched/bytes matched) 0/0
(depth/total drops/no-buffer drops) 0/0/0
Class-map: Patch-management (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps
Match: access-group name patch-servers
0 packets, 0 bytes
5 minute rate 0 bps
Class-map: class-default (match-any)
22590 packets, 5371873 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 256
(total queued/total drops/no-buffer drops) 0/0/0
QoS Set
dscp default
Packets marked 22297
Now when I add up the bandwidth allocated by this policy I come up with 1110kbps. The interface shows 1536kbps.
When I try to allocate 384 kbps to:
class Patch-management
bandwidth 384
I get:
I/f Serial2/0/2:0 class Patch-management requested bandwidth 384 (kbps), available only 12 (kbps)
What gives?
-mike
Solved! Go to Solution.
01-16-2007 02:34 PM
Mike,
What you are seeing is the normal behavior. Router, by default, only allows 75% of available bandwidth for bandwidth allocation on an interface and it reserves the other 25% for best effort and control traffic. You can change this behavior with the command 'max-reserved-bandwidth (%)' under the interface. This would allow you to allocate more bandwidth (up to 100%) for QOS traffic. However, be careful when using this command as you don't want to starve the control & best effort traffic of any bandwidth.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124tcr/tqos_r/qos_m1ht.htm#wp1141987
HTH
Sundar
01-16-2007 02:34 PM
Mike,
What you are seeing is the normal behavior. Router, by default, only allows 75% of available bandwidth for bandwidth allocation on an interface and it reserves the other 25% for best effort and control traffic. You can change this behavior with the command 'max-reserved-bandwidth (%)' under the interface. This would allow you to allocate more bandwidth (up to 100%) for QOS traffic. However, be careful when using this command as you don't want to starve the control & best effort traffic of any bandwidth.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124tcr/tqos_r/qos_m1ht.htm#wp1141987
HTH
Sundar
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