Enterprise QoS Solution Reference Network Design Guide

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