Thursday, December 18, 2008

FRTS versus MQC FRTS - Part I

MQC FRTS (Modular Quallity Of Service Command Line Interface Frame Relay Traffic Shaping!) has become mainstream in IOS 12.4. This enables FRTS to conform to the same MQC standard method of configuration.

In the following example i use FRTS on the spoke routers with the equivalent MQC FRTS configuration on the hub router.

Spoke Router Config

map-class frame-relay RICH
frame-relay cir 768000
frame-relay bc 7680
frame-relay fair-queue
frame-relay fragment 960

interface Serial2/0
frame-relay traffic-shaping
frame-relay interface-dlci 405
class RICH

Hub Router Config

policy-map SHAPE
class class-default
shape average 768000 7680 0

interface Serial2/0.35 multipoint
service-policy output SHAPE
interface Serial2/0.54 multipoint
service-policy output SHAPE

Points of note
1) For the shaping within MQC this requires the configuration to be done under the class class-default.
2) If required the class-default can reference another policy map, via the service-policy command. In this way CBWFQ or LLQ can also be introduced.
3) the 'shape average 768000 7680' command equates to the 'frame-relay cir 768000' plus the 'frame-relay bc 7680' command.

For verification use 'show traffic-shape' for FRTS and 'show policy-map' for MQC FRTS


s traffic-shape

Interface Se2/0.35
Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes) Active
503 768000 6048 768000 0 63 6048 -

s policy-map int s2/0.54


Service-policy output: SHAPE

Class-map: class-default (match-any)
22 packets, 242 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
768000/768000 960 7680 0 10 960

Adapt Queue Packets Bytes Packets Bytes Shaping
Active Depth Delayed Delayed Active
- 0 22 242 0 0 no

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