[nsp] IP header compression and PPP over FR

From: Thomas Kernen (tkernen@deckpoint.ch)
Date: Wed Apr 24 2002 - 12:09:48 EDT


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



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