Hi All,
I have a question and I hope someone can help me. I have a pair of Cisco 2621XM routers that are installed in 2 sites and connected by a E1 leased line. In our environment, the Citrix traffics are the most critcal traffics so that I set the CBWFQ in both serial ports and configure it to have 70% of bandwidth for this traffics. Here are the configuration:
------------------------------------ : class-map match-all ica_class match access-group 100 ! ! policy-map ica_policy class ica_class bandwidth percent 70 class class-default fair-queue ! interface Serial0/1 service-policy output ica_policy ! : access-list 100 permit tcp any any eq 1494 :
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I suppose the Citrix traffics will have at least 70% of bandwidth. However, I found that there were many packet drops in the interface:
------------------------------------------------------------------ Serial0/1 is up, line protocol is up Hardware is PowerQUICC Serial Internet address is x.x.x.x/30 MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec, reliability 255/255, txload 149/255, rxload 12/255 Encapsulation HDLC, loopback not set Keepalive set (10 sec) Last input 00:00:00, output 00:00:00, output hang never Last clearing of "show interface" counters 1d06h Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops:
75890 Queueing strategy: weighted fair Output queue: 0/1000/64/75890 (size/max total/threshold/drops) Conversations 0/146/256 (active/max active/max total) Reserved Conversations 1/1 (allocated/max allocated) Available Bandwidth 103 kilobits/sec 30 second input rate 100000 bits/sec, 180 packets/sec 30 second output rate 1304000 bits/sec, 207 packets/sec 93030496 packets input, 2825911235 bytes, 0 no buffer Received 43090 broadcasts, 0 runts, 0 giants, 0 throttles 1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort 81198918 packets output, 3082321637 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up------------------------------------------------------------------
Router#show policy-map interface s0/1 Serial0/1
Service-policy output: ica_policy
Class-map: ica_class (match-all) 67471882 packets, 10015898781 bytes 30 second offered rate 1050000 bps, drop rate 5000 bps Match: access-group 100 Queueing Output Queue: Conversation 265 Bandwidth 70 (%) Bandwidth 1433 (kbps) Max Threshold 64 (packets) (pkts matched/bytes matched) 19586022/5141810742 (depth/total drops/no-buffer drops) 0/73390/0
Class-map: class-default (match-any) 13819195 packets, 5996917160 bytes 30 second offered rate 340000 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) 0/2743/0
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As you can see in the "Show policy interface" output, there is only
1.3Mbps in the E1 (2Mbps) link but the output packets were started to drop. Moreover, the drop rate of the "ica_policy" group is much higher than the "default group". Does anyone know why? Thanks.Regards, Dovelet