Monitoring the Frame Relay Voice Adaptive Feature

This topic describes monitoring the FR-VATS feature using Cisco IOS software commands.

The show policy map command gives a static verification of the policy configuration only. No dynamic counters are included in its output. The following is a sample output:

WAN-EDGE#show policy TRAFFIC-SHAPE Policy Map TRAFFIC-SHAPE Class class-default Traffic Shaping

Average Rate Traffic Shaping

CIR 729600 (bps) Max. Buffers Limit 1000 (Packets) Bc 3648 Be 0

Adapt to 364800 (bps)

Voice Adapt Deactivation Timer 30 Sec

Note The highlighted section in the example shows the configuration specifics related to CIR, minCIR, and the default FR-VATS deactivation timer.

The show frame-relay fragment command provides verification of the fragment size, whether static fragmentation or voice-adaptive fragmentation is configured for a DLCI. Additionally, dynamic counters monitor how many frames required fragmentation in either direction. The following is a sample output:

WAN-EDGE#show frame-relay fragment 102 interface dlci frag-type frag-size in-frag out-frag dropped-frag

Serial2/0.12 102 end-to-end 480 5476 2035 0


The highlighted section shows, on the DLCI 102, the end-to-end fragmentation type, configured fragmentation size on the DLCI, and the total number of fragments sent by the designated DLCI 102.

The show frame-relay pvc command provides detailed traffic counters for Frame Relay DLCIs. Also, this command verifies that adaptive fragmentation has been enabled and is currently active on the DLCI. The following is a sample output:

WAN-EDGE#show frame-relay pvc 102

PVC Statistics for interface Serial2/0 (Frame Relay DTE)

DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial2/0.12 input pkts 97269 output pkts 96892 in bytes 34314039

out bytes 34 6224 4 6 dropped pkts 0 in pkts dropped 0

out pkts dropped 19 out bytes dropped 1596

late-dropped out pkts 19 late-dropped out bytes 1596

in FECN pkts 0 in BECN pkts 0 out FECN pkts 0

out BECN pkts 0 in DE pkts 0 out DE pkts 0

out bcast pkts 62064 out bcast bytes 5315261

5 minute input rate 150000 bits/sec, 26 packets/sec 5 minute output rate 151000 bits/sec, 26 packets/sec pvc create time 3d02h, last time pvc status changed 00:13:08

fragment type end-to-end fragment size 480 adaptive active, time left 28 sees

Note The highlighted section indicates that there is currently an active end-to-end session and that there are 28 seconds left before the router throttles the Frame Relay circuit back up to the CIR rate.

The show policy interface command is the most useful of the show commands, and verifies that FR-VATS is active, due to the presence of voice traffic on the link. The following is a sample output:

WAN-EDGE#show policy interface serial 2/0.12

Serial2/0.12: DLCI 102 -

Service-policy output: MQC-FR-VATS-7 68

Class-map: class-default (match-any) 35164 packets, 30211929 bytes

30 second offered rate 234000 bps, drop rate 0 bps Match: any

Traffic Shaping Target/Average Rate

729600/729600 Adapt Queue Active Depth BECN 0

Byte Sustain Limit bits/int

456 3648

Packets Bytes


Excess bits/int 0

Packets Delayed 30255560 13977

Interval (ms) 5

Bytes Delayed 3645051

Increment (bytes)

456 Shaping Active yes

Voice Adaptive Shaping active, time left 29 secs

Note The highlighted section shows that the FR-VATS feature is active. Also, the time left for FR-

VATS to deactivate is included in the output. The output for this command has been truncated, because it is not directly relevant to this example, but if the total output was included, it would show the nested queuing policies assigned to the interface.

Was this article helpful?

0 0

Post a comment