Step 2
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Enter the show policy-map interface command to display low-latency queueing information, packet counters, and statistics for the policy map applied to the interface. Compare the values in the "packets" and the "pkts matched" counters; under normal circumstances, the "packets" counter is much larger than the "pkts matched" counter. If the values of the two counters are nearly equal, then the interface is receiving a large number of process-switched packets or is heavily congested.
The following sample output for the show policy-map interface command is based on the configuration in Step 1:
Example:
Router# show policy-map interface serial 1/1
Serial1/1
Service-policy output:shaper
Class-map:class-default (match-any)
12617 packets, 1321846 bytes
5 minute offered rate 33000 bps, drop rate 0 bps
Match:any
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
192000/96000 1992 7968 7968 83 1992
Adapt Queue Packets Bytes Packets Bytes Shaping
Active Depth Delayed Delayed Active
- 0 12586 1321540 0 0 no
Service-policy :llq
Class-map:voice (match-all)
3146 packets, 283140 bytes
5 minute offered rate 7000 bps, drop rate 0 bps
Match:ip precedence 1
Weighted Fair Queueing
Strict Priority
Output Queue:Conversation 24
Bandwidth 64 (kbps) Burst 1600 (Bytes)
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
Class-map:class-default (match-any)
9471 packets, 1038706 bytes
5 minute offered rate 26000 bps
Match:any
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Step 3
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Enter the show interfaces serialcommand to display information about the queueing strategy, priority queue interleaving, and type of fragmentation configured on the interface. You can determine whether the interface has reached a congestion condition and packets have been queued by looking at the "Conversations" fields. A nonzero value for "max active" counter shows whether any queues have been active. If the "active" counter is a nonzero value, you can use the show queue command to view the contents of the queues.
The following sample output for the show interfaces serialcommand is based on the configuration in Step 1:
Example:
Router# show interfaces serial 1/1
Serial1/1 is up, line protocol is up
Hardware is M4T
Internet address is 16.0.0.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 5/255, rxload 1/255
Encapsulation FRAME-RELAY, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
LMI enq sent 40, LMI stat recvd 40, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 1023 LMI type is CISCO frame relay DTE
Fragmentation type:end-to-end, size 80, PQ interleaves 0
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:06:34
Input queue:0/75/0/0 (size/max/drops/flushes); Total output drops:0
Queueing strategy:weighted fair
Output queue:0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 33000 bits/sec, 40 packets/sec
40 packets input, 576 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
15929 packets output, 1668870 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
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