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Output Queue dropping packets before it is congested

I'm getting packet drops in queues when there is no congestion. See the show policy-map below. You can packets dropping in the voice-control queue and its well below the 245k reserved for it and if you add up all of the bandwidth you will see I'm well below being congested. Anyone have any thoughts?

show policy-map int mult1

Multilink1

Service-policy output: WAN-EDGE-OUTPUT-SPRINT

Class-map: VOICE (match-any)

119770 packets, 17876400 bytes

2 minute offered rate 20000 bps, drop rate 0 bps

Match: ip dscp ef

119770 packets, 17876400 bytes

2 minute rate 20000 bps

Match: ip precedence 5

0 packets, 0 bytes

2 minute rate 0 bps

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 38 (%)

Bandwidth 1167 (kbps) Burst 29175 (Bytes)

(pkts matched/bytes matched) 119770/17876400

(total drops/bytes drops) 0/0

Class-map: VIDEO (match-any)

0 packets, 0 bytes

2 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp af41

0 packets, 0 bytes

2 minute rate 0 bps

Match: ip precedence 4

0 packets, 0 bytes

2 minute rate 0 bps

Queueing

Output Queue: Conversation 265

Bandwidth 1 (%)

Bandwidth 30 (kbps) Max Threshold 64 (packets)

(pkts matched/bytes matched) 0/0

(depth/total drops/no-buffer drops) 0/0/0

Class-map: VOICE-CONTROL (match-any)

49120 packets, 8822176 bytes

2 minute offered rate 36000 bps, drop rate 6000 bps

Match: ip dscp cs3

0 packets, 0 bytes

2 minute rate 0 bps

Match: ip precedence 3

49120 packets, 8822176 bytes

2 minute rate 36000 bps

Match: ip dscp af31

0 packets, 0 bytes

2 minute rate 0 bps

Queueing

Output Queue: Conversation 266

Bandwidth 8 (%)

Bandwidth 245 (kbps) Max Threshold 64 (packets)

(pkts matched/bytes matched) 49222/8840584

(depth/total drops/no-buffer drops) 0/296/0

Class-map: GOLD-DATA (match-any)

640868 packets, 142884152 bytes

2 minute offered rate 252000 bps, drop rate 0 bps

Match: ip dscp af23

640868 packets, 142884152 bytes

2 minute rate 252000 bps

Match: ip precedence 2

0 packets, 0 bytes

2 minute rate 0 bps

Queueing

Output Queue: Conversation 267

Bandwidth 28 (%)

Bandwidth 860 (kbps) Max Threshold 64 (packets)

(pkts matched/bytes matched) 642023/143096436

(depth/total drops/no-buffer drops) 0/126/0

Class-map: class-default (match-any)

317560 packets, 118077365 bytes

2 minute offered rate 136000 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) 0/31/0

exponential weight: 9

1 REPLY
New Member

Re: Output Queue dropping packets before it is congested

Check 'offered rate' in 'show policy-map int' includes all traffics in the the various classes even when there is no congestion.Also check for SNA performance on the interface.Add 'queue-limit 256' to class-default.This eliminates all packet drops with respect to a set of FTP jobs.

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