From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue Nov 16 2004 - 20:25:55 GMT-3
Hey Tony,
I actually thought I understood what header and payload compression did and
thougth they were mutually exclusive because payload compression actually
does the compress the layer 3 headers but not the layer headers.
But, I just heard that on frame relay interfaces, both header and payload
compression can be implemented at the same time. So, I was wondering under
what other situations can and/or this should be done.
Thanks for your reply, Tim
----- Original Message -----
From: "Tony Schaffran" <groupstudy@cconlinelabs.com>
To: "'Ian Stong'" <istong@stong.org>; "'ccie2be'" <ccie2be@nyc.rr.com>;
"'Group Study'" <ccielab@groupstudy.com>
Sent: Tuesday, November 16, 2004 6:05 PM
Subject: RE: Header and Payload Compression
Actually, if you understand what header and payload compression are doing,
you will be able to answer you own question. There are times when one or
the other are applicable and times when both are needed, especially when it
comes to voice and data traffic and the QoS that will be needed to pass
both.
Yes, the router capabilities (cpu, etc) are a factor, but just because the
router cannot handle the extra cpu cycles, that should not be a deciding
factor. As you find situations where header and payload compression are
needed, you will find just cause to upgrade the equipment.
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCDS, NNCSS, CNE, MCSE
www.cconlinelabs.com
Your #1 choice for online Cisco rack rentals.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Ian
Stong
Sent: Tuesday, November 16, 2004 2:39 PM
To: 'ccie2be'; 'Group Study'
Subject: RE: Header and Payload Compression
I've found that it really depends a lot on the link speed versus the
capabilities (cpu, etc) of the router. In some cases there is little to no
advantage to enabling both compressions methods. Especially true if the
router gets bogged down doing the compression/decompression. In that case
you could enable header and leave off payload compression. There are
several factors to consider above and beyond cpu. What latency if any is
added versus the savings in the size of the packet and so forth.
Thanks,
Ian
http://www.ccie4u.com
CCIE Lab Rack Rentals and Lab Scenarios starting at $20
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: Tuesday, November 16, 2004 5:16 PM
To: Group Study
Subject: Header and Payload Compression
Hi guys,
Are there any situations or reasons header and payload compression shouldn't
both be used at the same time on the same link?
Also, when connecting a Cisco router to a non-cisco router, which
compression
method can be used? I think Cisco's implementation of Stac is proprietary,
but I'm not sure about Predictor.
TIA, Tim
This archive was generated by hypermail 2.1.4 : Thu Dec 02 2004 - 06:57:46 GMT-3