Enterprise QoS Solution Reference Network Design Guide
Enterprise QoS Solution Reference Network Design Guide
Enterprise QoS Solution Reference Network Design Guide
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WAN Edge Link-Specific <strong>QoS</strong> <strong>Design</strong><br />
Verification Command: show interface<br />
3-18<br />
<strong>Enterprise</strong> <strong>QoS</strong> <strong>Solution</strong> <strong>Reference</strong> <strong>Network</strong> <strong>Design</strong> <strong>Guide</strong><br />
Chapter 3 WAN Aggregator <strong>QoS</strong> <strong>Design</strong><br />
The show interface command indicates whether drops are occurring on an interface (an indication of<br />
congestion). Additionally, on a multilink interface with LFI enabled, the command displays interleaving<br />
statistics, as shown in Example 3-11.<br />
Example 3-11 show interface Verification of MLP LFI on a Slow-Speed Leased Line<br />
WAG-7206-Left#show interface multilink 1<br />
Multilink1 is up, line protocol is up<br />
Hardware is multilink group interface<br />
Description: 768 kbps Leased-Line to RBR-3745-Left<br />
Internet address is 10.1.112.1/30<br />
MTU 1500 bytes, BW 768 Kbit, DLY 100000 usec,<br />
reliability 255/255, txload 233/255, rxload 1/255<br />
Encapsulation PPP, LCP Open, multilink Open<br />
Open: CDPCP, IPCP, loopback not set<br />
DTR is pulsed for 2 seconds on reset<br />
Last input 00:00:01, output never, output hang never<br />
Last clearing of "show interface" counters 00:16:15<br />
Input queue: 0/75/0/0 (size/max/drops/flushes);<br />
Total output drops: 49127<br />
Queueing strategy: weighted fair<br />
Output queue: 54/1000/64/49127/185507<br />
(size/max total/threshold/drops/interleaves)<br />
In Example Example 3-11, 49,127 drops have occurred on the multilink interface (because of<br />
congestion), and LFI has engaged with 185,507 interleaves of voice with data.<br />
Verification Command: show policy interface (Three-Class Policy)<br />
The show policy interface command is probably the most useful show command for MQC-based <strong>QoS</strong><br />
policies. It displays a wide array of dynamic statistics, including the number of matches on a class map<br />
as a whole, the number of matches against each discrete match statement within a class map, the number<br />
of queued or dropped packets (either tail dropped or WRED dropped), and many other relevant <strong>QoS</strong><br />
statistics. Example 3-12 shows example output of the show policy interface command.<br />
Example 3-12 show policy interface Verification of a Three-Class Policy on a Slow-Speed Leased Line<br />
WAG-7206-Left#show policy interface multilink 1<br />
Multilink1<br />
Service-policy output: WAN-EDGE<br />
Class-map: Voice (match-all)<br />
68392 packets, 4377088 bytes<br />
30 second offered rate 102000 bps, drop rate 0 bps<br />
Match: ip dscp ef<br />
Queueing<br />
Strict Priority<br />
Output Queue: Conversation 264<br />
Bandwidth 33 (%)<br />
Bandwidth 253 (kbps) Burst 6325 (Bytes)<br />
(pkts matched/bytes matched) 68392/2043848<br />
(total drops/bytes drops) 0/0<br />
compress:<br />
header ip rtp<br />
UDP/RTP compression:<br />
Sent: 68392 total, 68388 compressed,<br />
2333240 bytes saved, 1770280 bytes sent<br />
2.31 efficiency improvement factor<br />
99% hit ratio, five minute miss rate 0 misses/sec,0 max<br />
Version 3.3