RE: Slightly OT: Compression on a PPP link? (Practical Answer)

From: Kenneth Wygand (KWygand@customonline.com)
Date: Sat Jan 31 2004 - 03:56:38 GMT-3

Thanks for your advice Richard... and yes, I meant "Stacker", not "Compressor"... long day as usual... :)
 
Thanks for your help,
Ken

        -----Original Message-----
        From: Richard Danu [mailto:rdanu@apex3.com]
        Sent: Fri 1/30/2004 8:45 PM
        To: Kenneth Wygand; ccielab@groupstudy.com
        Cc:
        Subject: RE: Slightly OT: Compression on a PPP link? (Practical Answer)
        
        

        Chances are, large files fill send full 1500 mtu files. You may be able to
        do some queueing allowing frames less than (say) 1300 mtu have a higher
        priority over files larger than 1300 mtu. Opposed to queueing you can also
        so policy based routing to split various frame sizes over your T-1 Links.
        (I would consider this as a least resort as you may potentially have a pipe
        full and one nearly "idle").
        
        I dont really know if either stack, predictor or mccp will do much on binary
        files. If you are sending mostly ASCII files, perhaps stack compression may
        help some.
        
        I haven't really heard of the "compressor" compression technique, unless we
        are really talking gases!
        
        ;)
        
        Richard
        
        -----Original Message-----
        From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
        Kenneth Wygand
        Sent: Thursday, January 29, 2004 3:47 PM
        To: ccielab@groupstudy.com
        Subject: Slightly OT: Compression on a PPP link? (Practical Answer)
        
        
        Hey everyone,
        
        
        
        I have two T1 links in a PPP multilink group, load balancing is working
        PERFECTLY.
        
        
        
        My problem is that the transfer of large image files over this link
        swamps both lines for a long period of time. I'm not sure what the
        format is of these images and if it is highly compressible or not.
        However, of the compression options available, are any of them more
        "friendly" to compressing graphical data? Does anyone have any
        real-world experience or practical examples of actual compression
        ratios?
        
        
        
        The compression algorithms I know of are Compressor, Predictor and MPPC.
        
        
        
        Also, how can I verify the compression ratio I am getting through a show
        command?
        
        
        
        Last question - does anyone know how much these algorithms tax the
        routers? I am using 2610s and 3640s with 8MB Flash and 32MB DRAM
        running 12.0 IOS.
        
        
        
        Thanks in advance!
        
        
        
        Kenneth E. Wygand
        Systems Engineer, Project Services
        
        CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
        Network+, A+
        Custom Computer Specialists, Inc.
        
        "Success is to be measured not so much by the position one has reached
        in life as by the obstacles which he has overcome while trying to
        succeed."
        -Booker Taliaferro Washington
        
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