We've configured LLQ on one of our Point to Point circuits. We uses LLQ to protect the following traffic on our network. Voice (Priority Queue) Voice control Citrix and IPCC
During high traffic volumes (>40%) we see drops in the citrix and/or IPCC queue even though there is plenty enough bandwidth on the circuit. Please see the example below;
pen-router1#sh policy-map int ser 0/0 Serial0/0
Service-policy output: VoiceFirst
Class-map: VOICE-media (match-all)
12982 packets, 830848 bytes 30 second offered rate 87000 bps, drop rate 0 bps Match: ip precedence 5 Queueing Strict Priority Output Queue: Conversation 264 Bandwidth 500 (kbps) Burst 12500 (Bytes) (pkts matched/bytes matched) 5101/326464 (total drops/bytes drops) 0/0Class-map: VOICE-sig (match-all)
966 packets, 70016 bytes 30 second offered rate 8000 bps, drop rate 0 bps Match: ip precedence 3 Queueing Output Queue: Conversation 265 Bandwidth remaining 10 (%) Max Threshold 64 (packets) (pkts matched/bytes matched) 559/45246 (depth/total drops/no-buffer drops) 0/0/0Class-map: CITRIX (match-any)
24578 packets, 5580021 bytes 30 second offered rate 752000 bps, drop rate 20000 bps Match: protocol citrix 0 packets, 0 bytes 30 second rate 0 bps Match: access-group 101 24578 packets, 5580021 bytes 30 second rate 752000 bps Queueing Output Queue: Conversation 266 Bandwidth remaining 70 (%) Max Threshold 64 (packets) (pkts matched/bytes matched) 13781/4892001 (depth/total drops/no-buffer drops) 0/267/0Class-map: IPCC-traffic (match-all)
126 packets, 7480 bytes 30 second offered rate 0 bps, drop rate 0 bps Match: access-group 100 Queueing Output Queue: Conversation 267 Bandwidth remaining 20 (%) Max Threshold 64 (packets) (pkts matched/bytes matched) 72/4158 (depth/total drops/no-buffer drops) 0/0/0Class-map: class-default (match-any)
1068 packets, 218716 bytes 30 second offered rate 23000 bps, drop rate 0 bps Match: any pen-router1#As you can see the drop rate on the citrix queue is 20000. However, only around
50-60% of the T1 is currently being using. So, in my opinion, there should be no reason for drop packets in this queue. Am I correct?