06-10-2009 08:57 PM - edited 03-15-2019 06:28 PM
Hi,
We have a priority queue setup our WAN interfaces and wehn looking at the stats we see the following from show policy-map int:
Class-map: VOICE (match-any)
945666 packets, 60522624 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip dscp ef (46)
945666 packets, 60522624 bytes
5 minute rate 0 bps
Queueing
Strict Priority
Output Queue: Conversation 72
Bandwidth 10 (%)
Bandwidth 194 (kbps) Burst 4850 (Bytes)
(pkts matched/bytes matched) 149037/9538368
(total drops/bytes drops) 0/0
QoS Set
dscp ef
Packets marked 945666
My question is why do we only see 149037 pkts matched in the queue but 945666 pkts matched in the policy?
Any ideas?
Solved! Go to Solution.
06-11-2009 05:11 AM
Hi,
From the command reference:
http://www.cisco.com/en/US/docs/ios/12_2/qos/command/reference/qrfcmd10.html#wp1049822
packets and bytes
Number of packets (also shown in bytes) identified as belonging to the class of traffic being displayed.
pkts matched/bytes matched
Number of packets (also shown in bytes) matching this class that were placed in the queue. This number reflects the total number of matching packets queued at any time. Packets matching this class are queued only when congestion exists. If packets match the class but are never queued because the network was not congested, those packets are not included in this total. However, if process switching is in use, the number of packets is always incremented even if the network is not congested.
In short, packets are only queued when the hardware ring is full. When the hardware ring is full, packets are queued in the software buffer. If there is space in the hardware ring, then packets are sent out and QoS isn't necessary. What you have here is probably a low use or high speed circuit that most of the voice packets are going directly onto the wire, and the queueing mechanism isn't being used for the majority of packets.
hth,
nick
06-11-2009 05:11 AM
Hi,
From the command reference:
http://www.cisco.com/en/US/docs/ios/12_2/qos/command/reference/qrfcmd10.html#wp1049822
packets and bytes
Number of packets (also shown in bytes) identified as belonging to the class of traffic being displayed.
pkts matched/bytes matched
Number of packets (also shown in bytes) matching this class that were placed in the queue. This number reflects the total number of matching packets queued at any time. Packets matching this class are queued only when congestion exists. If packets match the class but are never queued because the network was not congested, those packets are not included in this total. However, if process switching is in use, the number of packets is always incremented even if the network is not congested.
In short, packets are only queued when the hardware ring is full. When the hardware ring is full, packets are queued in the software buffer. If there is space in the hardware ring, then packets are sent out and QoS isn't necessary. What you have here is probably a low use or high speed circuit that most of the voice packets are going directly onto the wire, and the queueing mechanism isn't being used for the majority of packets.
hth,
nick
07-08-2009 09:21 PM
Great thanks for the information, makes sense
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