""Priscilla Oppenheimer"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > WAN compression usually compresses the data payload. The HDLC sequence > numbers are not in data packets; they are in keepalive packets. They are in > the control plane, not the user plane. > > I can't say for sure, but my guess is that they are not compressed. If they > were, the interfaces wouldn't have a way to monitor the status of the link. > What does Cisco documentation say? Sorry I'm in a rush and can't look it up.
I checked the 12.1 docs. no help there. both the config guide and the command reference talk about "frame compression" I "believe" the implication is that the data itself is compressed, but the frame header is not. Separately, there are sections on RTP header compression, but that is a different issue. Let me step out on a limb here and postulate that in terms of process, the router first compresses the data, then attaches the HDLC frame. Much the same way that when compression is uese on the LAN, the data is compressed, but the L2 header is not. Anyone snifed this and have a scientific answer? > > Good question! Thanks for returning the forum to something meaningfull. > > Priscilla > > Simmi Singla wrote: > > > > Hi All, > > I have question regarding HDLC,a silly question but still a > > doubt.See I have HDLC connection back to back.on one interface > > I configure compression and other interface on other router no > > compression.Now when I debug the my seq and mine seen no.s are > > in sync I mean same they inncrease ,that different no layer 3 > > communication I am able to do.If such case occurs how from > > debug commands I will come to know. > > I enabled debug serial interface but it only shows me that the > > no get increment that too in proper order but I have read that > > in Karl Solie book Vol1 that it will stop increment the > > keepalives. > > So can anybody guide me. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=60358&t=60337 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
