I am shaping my outbound router (2921) link to 50Mbs. I have my QOS policy nested inside my shaping policy and I have noticed (what I think) is a high amount of packet drops in one of my queues.
Below is the output of 2 show policy-map interface g0/0 run back to back. As you can see I lost around 21 packets in just a few seconds, yet my link is only using around 7Mbs. My counters were cleared around 3 hours before I took this sample. I have my 2 QOS policies listed after the output. Any ideas why I am seeing all these packet drops? My QoS understanding isn't exactly expert level yet, but it seems like something isn't working correctly. Any tips would be appreciated. Thanks in advance.
Service-policy output: SHAPE
Class-map: class-default (match-any)
31573394 packets, 23655469220 bytes
30 second offered rate 7131000 bps, drop rate 13000 bps
I am putting the majority of my business WAN traffic in AF21 and setting my internet and a few bandwidth hogging servers in class-default. I increased my queue-limit on my AF21 class to 256 and I have already lost 2715 packets in 15 minutes.
I guess I dont understand why a drop-rate is being applied when the link isn't full, or the queue isn't even hitting it's minimum bandwidth limit of 17Mbs. Should I maybe increase my Bc value to something higher than the default 4ms?
After the initial loss of packets, packet loss slowed down to almost nothing, so increasing the queue limit seems to have helped.
Packets that match that class will be placed in queues before they are dequeued. If the numbers of queues aren't enough, you will get packet drops. This behavior will occur even if you aren't reaching the maximum available throughput of the link and often seen under bursty traffic conditions.
As you stated, the situation has been resolved so please mark the thread accordingly.
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