FRF9 stac compression

[devsharma]

I have implemented frf9 stac compression(software) on frame relay sub-interfaces for a particular pvc.The router model is 2621 and IOS is 12.2(5d).The link capacity is 56 K.When I issue the command sh compress,I see all the counters to zero.The command output is shown below:

Serial0/0 - DLCI: 53

Software compression enabled

uncompressed bytes xmt/rcv 0/0

compressed bytes xmt/rcv 0/0

1 min avg ratio xmt/rcv 0.000/0.000

5 min avg ratio xmt/rcv 0.000/0.000

10 min avg ratio xmt/rcv 0.000/0.000

no bufs xmt 0 no bufs rcv 0

resyncs 0

Additional Stacker Stats:

Transmit bytes: Uncompressed = 0 Compressed = 0

Received bytes: Compressed = 0 Uncompressed = 0

[b.hsu]

Check whether Compression has been enabled on both sides of the circuit. Because if it is enabled on one side compression will not work.There could be more reasons on why compression is not working like

1.Mismatched software versions. The same version of code needs to be run on both sides of the link, and it needs to be Cisco IOS Software Release 11.3T or later. In particular, Cisco IOS Software Release 11.2 and 12.0 are non-interoperable for compression.

2.Compression is not enabled with the same parameters on both sides of a link. The hardware on either side does not need to be the same, but the encapsulation and type of compression must be.

3.An attempt to run "fancy queuing" and compression. Cisco only supports FIFO queuing with layer two payload compression. Weighted Fair Queuing is on by default, so to turn it off you need to issue the no fair-queue command.

For more details refer the troubleshooting section in the URL

http://www.cisco.com/en/US/tech/tk713/tk802/technologies_q_and_a_item09186a008019be75.shtml