Re: [nsp] IP header compression and PPP over FR

From: Stefan Simko (Stefan.Simko@KPNQwest.com)
Date: Thu Apr 25 2002 - 03:40:41 EDT


Hi
ip tcp header-compression in 12.2.7 is broken. I hit some of these
bugs. I tested 12.2(9.4), which fixes it again.

bugIDs:

CSCdw91283
CSCdw46908

maybe CSCdu66004 (these are from the case notes, don't have time to
study it)
CSCdu71023
CSCdt07798
CSCds26729

> Has anyone succesfully been able to get IPHC (header
> compression/TCP/RTP) working on a PPP over FR interface. We are trying
> to bypass the FR limitation of 256 sessions by using PPP over FR that
> allows us to set a max of 1000 sessions per interface
> (virtual-template). sh ip rtp header-compression does return the valid
> info but no streams are actually compressed.
> This is on a pair of 7200VXR/300s with 12.2(7)a. We have other
> interfaces (serial or FR) that work just fine, only with the PPP over FR
> do we encounter this problem. And yes there is actual traffic on this
> circuit, it was running IPHC over FR, we moved to PPP over FR to be able
> to compress more sessions than the 256 limit.

> interface Serial1/0
> bandwidth 2048
> no ip address
> no ip redirects
> no ip unreachables
> no ip proxy-arp
> encapsulation frame-relay
> no fair-queue
> serial restart-delay 0
> frame-relay lmi-type ansi
> !
> interface Serial1/0.600 point-to-point
> bandwidth 2048
> no ip redirects
> no ip proxy-arp
> frame-relay interface-dlci 600 ppp Virtual-Template1

> interface Virtual-Template1
> ip address 192.168.1.1 255.255.255.252
> no ip redirects
> no ip proxy-arp
> ip tcp header-compression iphc-format
> ip tcp compression-connections 256
> ip rtp header-compression iphc-format
> ip rtp compression-connections 1000

> RTP/UDP/IP header compression statistics:

> Interface Virtual-Access1:
> Rcvd: 0 total, 0 compressed, 0 errors
> 0 dropped, 0 buffer copies, 0 buffer failures
> Sent: 0 total, 0 compressed,
> 0 bytes saved, 0 bytes sent
> Connect: 1000 rx slots, 1000 tx slots,
> 0 long searches, 0 misses 0 collisions, 0 negative cache
> hits

> Interface Virtual-Template1:
> Rcvd: 0 total, 0 compressed, 0 errors
> 0 dropped, 0 buffer copies, 0 buffer failures
> Sent: 0 total, 0 compressed,
> 0 bytes saved, 0 bytes sent
> Connect: 1000 rx slots, 1000 tx slots,
> 0 long searches, 0 misses 0 collisions, 0 negative cache
> hits

> Cheers
> Thomas

---
Stefan Simko, KPNQwest Czechia, tel. +420 2 81081081



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