Cisco3845-Cisco3660 and AIM-COMPR4

Unanswered Question
Mar 7th, 2008

Good day.

I have 2 router:Cisco3845 and Cisco3660.

They conected using FrameRelay point-to-point:

Router1#

!

interface Hssi1/0

no ip address

encapsulation frame-relay

no ip mroute-cache

load-interval 30

serial restart-delay 0

cdp enable

frame-relay traffic-shaping

frame-relay interface-dlci 20 switched

class h

frame-relay interface-queue priority 450 100 100 400

!

interface Hssi1/0.17 point-to-point

ip address 192.168.1.29 255.255.255.252

frame-relay class data

frame-relay interface-dlci 17

!

interface Hssi1/0.18 point-to-point

ip address 192.168.137.26 255.255.255.252

frame-relay class voice

frame-relay interface-dlci 18

frame-relay ip rtp header-compression

!

...

!

map-class frame-relay data

frame-relay cir 8400000

frame-relay bc 840000

frame-relay be 840000

frame-relay mincir 98000

frame-relay adaptive-shaping becn

frame-relay fair-queue

frame-relay interface-queue fair queue-limit 32

frame-relay interface-queue priority low

!

map-class frame-relay voice

frame-relay cir 8400000

frame-relay bc 840000

frame-relay be 840000

frame-relay mincir 6028000

frame-relay adaptive-shaping becn

frame-relay fair-queue

frame-relay interface-queue fair queue-limit 32

frame-relay interface-queue priority high

!

router2#

!

interface Hssi2/0

no ip address

encapsulation frame-relay

no ip mroute-cache

load-interval 30

serial restart-delay 0

cdp enable

frame-relay traffic-shaping

frame-relay interface-dlci 20 switched

class h

frame-relay intf-type dce

frame-relay interface-queue priority 350 100 100 400

!

interface Hssi2/0.17 point-to-point

ip address 192.168.1.30 255.255.255.252

frame-relay class data

frame-relay interface-dlci 17

!

interface Hssi2/0.18 point-to-point

ip address 192.168.137.25 255.255.255.252

frame-relay class voice

frame-relay interface-dlci 18

frame-relay ip rtp header-compression

!

...

!

map-class frame-relay data

frame-relay adaptive-shaping becn

frame-relay cir 17900000

frame-relay bc 1790000

frame-relay be 1790000

frame-relay mincir 3804000

frame-relay fair-queue

frame-relay interface-queue priority low

!

map-class frame-relay voice

frame-relay adaptive-shaping becn

frame-relay cir 17900000

frame-relay bc 1790000

frame-relay be 1790000

frame-relay mincir 12000000

frame-relay fair-queue

frame-relay interface-queue priority high

!

When I install AIM-COMPR4 card on both router and write comand:

frame-relay payload-compress data-stream stac on interface Hssi2/0.18 point-to-point and interface Hssi1/0.18 point-to-point

I have nutch packet lost on router2# (Cisco 3660) 3660#sh compress

Hssi2/0 - DLCI: 18

Hardware compression enabled

CSA in slot 0 in use

uncompressed bytes xmt/rcv 112931766/167113853

compressed bytes xmt/rcv 14014362/153973667

Compressed bytes sent: 14014362 bytes 7 Kbits/sec ratio: 8.058

Compressed bytes recv: 153973667 bytes 84 Kbits/sec ratio: 1.085

resyncs 128406

last clearing of counters: 14528 seconds

Additional Stac Stats:

Transmit bytes: Uncompressed = 6351074 Compressed = 6365848

Received bytes: Compressed = 142596663 Uncompressed = 0

Can any one answer: Whats a hapend?

I have this problem too.
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Itap Fri, 03/07/2008 - 19:33

When I input command on router 3660: 2# sh compress I see to much "resyncs", near 128406 in 2 minites. And if I try to ping ip address on router #1 (3845), there near 50% lost pakets.

If I delete command #"frame-relay payload-compress data-stream stac" from FrameRelay interfase, after this if I try to ping ip address on router #1 (3845), there no any lost pakets.

Paolo Bevilacqua Sat, 03/08/2008 - 05:33

If you ping end-to-end (not from routers but from end systems) do you have packet loss with compression enabled ?

Itap Sun, 03/09/2008 - 22:42

Yes, I have packet lost, when i ping end-to-end with compression enabled.

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