Compression STAC or Predictor , How to tell ?

[crscrsone]

How can I tell what compression algorithms the interface use ?

Since both predictor and stac use software compression.

predictor Specifies that a predictor (RAND) compression algorithm will be used on LAPB and PPP encapsulation. Compression is implemented in the software installed in the router's main processor.

stac Specifies that a Stacker (LZS) compression algorithm will be used on LAPB, HDLC, and PPP encapsulation. For all platforms except Cisco 7200 series and platforms that support the VIP2, compression is implemented in the software installed in the router's main processor.

Router# show compress

Serial0

uncompressed bytes xmt/rcv 10710562/11376835

1 min avg ratio xmt/rcv 2.773/2.474

5 min avg ratio xmt/rcv 4.084/3.793

10 min avg ratio xmt/rcv 4.125/3.873

no bufs xmt 0 no bufs rcv 0

resets 0

Router# show compress

Serial6/1

Hardware compression enabled

Compressed bytes sent: 402 bytes 0 Kbits/sec ratio: 4.092

Compressed bytes recv: 390 bytes 0 Kbits/sec ratio: 3.476

restarts:1

last clearing of counters: 1278 seconds

Ref-http://www.cisco.com/en/US/products/sw/iosswrel/ps1820/products_feature_guide09186a00800807e0.html#xtocid58627

Please be advise, THANKS

[icabrera · Accepted solution]

Hi, the first show command hasn't compression enabled and the second has hardware compression.

See next url for examples at interfaces with software compression enabled:

http://www.cisco.com/en/US/tech/tk713/tk802/technologies_tech_note09186a008035b8c5.shtml

Regards

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