Hi Priscilla/All, Thanx for the reply.all are absolutely right when keepalives are exchanged they are not compressed.i would like to mention here only keepalives.I debug the o/p again ,even the cdp frames are compressed. Like to share the Debug O/P with u all for dummy setup client------------------server(DCE) 1.1.1.1 1.1.1.2 cdp enabled cdp enabled Stac enabled no compression
In this scenario the keepalives are exchanged properly and the link status also remains up. Debug all client side# 00:15:55: Serial0: HDLC myseq 27, mineseen 27*, yourseen 28, line up 00:15:55: Serial0: COMPRESS: (expansion) status: 6, size in: 20, size out: 14 00:15:57: CDP-PA: Packet received from server on interface Serial0 00:16:05: Serial0: HDLC myseq 28, mineseen 28*, yourseen 29, line up 00:16:05: Serial0: COMPRESS: (expansion) status: 6, size in: 20, size out: 14 00:16:15: Serial0: HDLC myseq 29, mineseen 29*, yourseen 30, line up 00:16:15: Serial0: COMPRESS: (expansion) status: 6, size in: 20, size out: 14PQU 00:16:25: Serial0: HDLC myseq 30, mineseen 30*, yourseen 31, line up 00:16:25: Serial0: COMPRESS: (expansion) status: 6, size in: 20, size out: 14PQU debug all server# *Mar 1 00:15:35.791: Serial0: HDLC myseq 27, mineseen 27*, yourseen 27, line up * *Mar 1 00:15:45.791: Serial0: HDLC myseq 28, mineseen 28*, yourseen 28, line up *Mar 1 00:15:55.791: Serial0: HDLC myseq 29, mineseen 29*, yourseen 29, line up *Mar 1 00:16:05.791: Serial0: HDLC myseq 30, mineseen 30*, yourseen 30, line up *Mar 1 00:16:08.815: crm_send_periodic_update *Mar 1 00:16:09.763: IP-ST: if_list try 0 *Mar 1 00:16:09.763: IP-ST: gw_list total 0, try 0, completed list TRUE *Mar 1 00:16:09.763: IP-Static: all_list, time elapsed 0 msPQUICC_FEC(0/0): PHY *Mar 1 00:16:15.791: Serial0: HDLC myseq 31, mineseen 31*, yourseen 31, line up *Mar 1 00:16:25.211: CDP-EV: Bad checksum in header *Mar 1 00:16:25.791: Serial0: HDLC myseq 32, mineseen 32*, yourseen 32, line up See the Cdp Bad checksum error in header. client side# sh cdp nei Device ID Local Intrfce Holdtme Capability Platform Port ID server Ser 0 171 R 1721 Ser 0 This Indicates that still I can accept Uncompressed packets although compression is enabled.But when it will send packets it will only send compressed packets. server side# sh cdp nei nothing is displayed Client side# ping 1.1.1.2(server) Server side#debug all *Mar 1 00:18:50.663: IP: s=120.7.3.160 (Serial0), d=32.64.1.230, len 6, dispose ip.formaterr *Mar 1 00:18:52.663: IP: s=112.7.3.160 (Serial0), d=32.64.1.214, len 6, dispose ip.formaterr *Mar 1 00:18:54.663: IP: s=104.7.3.160 (Serial0), d=32.64.1.200, len 6, dispose ip.formaterr *Mar 1 00:18:55.791: Serial0: HDLC myseq 47, mineseen 47*, yourseen 47, line up *Mar 1 00:18:56.663: IP: s=96.7.3.160 (Serial0), d=44.120.220.46, len 6, dispos e ip.formaterr * ial0: HDLC myseq 55, mineseen 55*, yourseen 55, line up Again the errors as it doesnot understand compressed data.But what are these ips ,ok the client before sending the packets on the interface have compressed the data thats why it shows strange ips after conversion.It is unable to decompress the data and displaying compressed data. anyway the question was whether keepalives are compressed are not so I used show compress which gave me the indication that no counters get incremented for compressed stats when keepalives are exchanged,but uncompressed sats were increasing that too with 20 byte increment that what i suspect is Compression stats messages which are exchanged although here on ine side command worked as compression was not enabled.this might not be a keepalive increment as keepalives as nothing to do with compression. Now for tcp header compression if enabled on one side I was unable to send tcp traffic from any side but we can ping as it doesnot use layer 4.. Thanx for all answers Bye Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=60496&t=60496 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
