Scenario:
You are responsible for the WAN links at the company you work for. Your routers have a very low CPU load and the serial interfaces you have are pretty slow. You decide one day to run TCP and UDP header compression to get the most out of your connections…let’s squeeze some bits!
Goal:
- All IP addresses have been preconfigured for you.
- Enable TCP and RTP header compression on both routers.
- Configure a maximum of 12 compressed TCP or RTP sessions.
- Router Smaller should only use compression when it receives compressed traffic.
IOS:
c3640-jk9s-mz.124-16.bin
Topology:
Video Solution:
Configuration Files
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Written by René Molenaar - CCIE #41726
why the copmress router showing the tcp and rtp compressing traffic although we just intiate the telnet traffick that affect on the tcp compression only
Compress#sh ip rtp header-compression
RTP/UDP/IP header compression statistics:
Interface Serial0/0 (compression on, Cisco, RTP)
Rcvd: 0 total, 0 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed, 0 status msgs, 0 not predicted
0 bytes saved, 0 bytes sent
Connect: 12 rx slots, 12 tx slots,
0 misses, 0 collisions, 0 negative cache hits, 12 free contexts
—-showing zero rtp traffic
Compress#sh ip tcp header-compression
TCP/IP header compression statistics:
Interface Serial0/0 (compression on, VJ)
Rcvd: 6 total, 5 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 8 total, 5 compressed, 0 status msgs, 0 not predicted
180 bytes saved, 147 bytes sent
2.22 efficiency improvement factor
Connect: 12 rx slots, 12 tx slots,
2 misses, 0 collisions, 0 negative cache hits, 12 free contexts
75% hit ratio, five minute miss rate 0 misses/sec, 0 max
showing in above that thre are tcp traffic
Hi Nour,
[code]Compress#sh ip rtp header-compression
RTP/UDP/IP header compression statistics:
Interface Serial0/0 (compression on, Cisco, RTP)
Rcvd: 0 total, 0 compressed, 0 errors, 0 status msgs[/code]
I don’t see any hits on the RTP compression?
[code]Compress#sh ip tcp header-compression
TCP/IP header compression statistics:
Interface Serial0/0 (compression on, VJ)
Rcvd: 6 total, 5 compressed, 0 errors, 0 status msgs[/code]
And I do see hits on TCP compression…
Rene
Compress#sh ip tcp header se0/0
TCP/IP header compression statistics:
Interface Serial0/0 (compression on, VJ)
Rcvd: 15 total, 14 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 26 total, 24 compressed, 0 status msgs, 0 not predicted
842 bytes saved, 239 bytes sent
4.52 efficiency improvement factor
Connect: 12 rx slots, 12 tx slots,
1 misses, 0 collisions, 0 negative cache hits, 11 free contexts
96% hit ratio, five minute miss rate 0 misses/sec, 0 max
========================================================
Smaller(config)#do sh ip tcp header-compres se0/0
TCP/IP header compression statistics:
Interface Serial0/0 (compression on, VJ, passive)
Rcvd: 26 total, 24 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 15 total, 14 compressed, 0 status msgs, 0 not predicted
461 bytes saved, 227 bytes sent
3.03 efficiency improvement factor
Connect: 12 rx slots, 12 tx slots,
1 misses, 0 collisions, 0 negative cache hits, 12 free contexts
93% hit ratio, five minute miss rate 0 misses/sec, 0 max