From: Jerry Toomey (jetoomey@xxxxxxxxx)
Date: Tue Aug 28 2001 - 15:00:44 GMT-3
Bob,
In a Cisco ASET lab it was explained to me that LF is part of the explorer
negotiation and that by setting LF properly, the packets are sent
correctly without having to chop them up. Why? Because the sending
workstation gets an explorer reply that says to keep the packet size down
to 1500 bytes.
I heard that if you don't do the "LF 1500" then they mark you down because
it is sloppy, not because it doesn't work.
Please correct me if I'm wrong.
Jerry
--- Bob Chahal <bob.chahal@ntlworld.com> wrote:
> I don't understand how if the LF is smaller that the MTU, then TCP will
> fragment. Surely when the LF is greater than the MTU then TCP
> fragments???
>
> ----- Original Message -----
> From: "Zeng Puyang" <zbridge98@yahoo.com>
> To: <ccielab@groupstudy.com>
> Sent: Tuesday, August 28, 2001 5:22 AM
> Subject: dlsw lf question
>
>
> > Hi, group:
> >
> > ring1-------R1<---dlsw--->R2----ethernet
> >
> > I always see (lf 1500) in the dlsw remote-peer command from cisco's
> example and ccie power session. But when read the design guide of the
> dlsw,
> I think it's not neccesary, at least for the TCP encapsulation. Could
> anyone
> make this clear for me?
> >
> > The following is from the design guide:
> http://www.cisco.com/warp/public/cc/pd/ibsw/ibdlsw/prodlit/dlsw4_rg.htm
> >
> > In general, when using TCP encapsulation, you probably will not need
> to
> change the largest frame size because TCP
> > fragments the frame size according to the MTU. For example, if the LF
> is
> smaller than the MTU, then TCP will fragment each packet and send them
> in
> sections across the WAN. If the LF is larger than the MTU, then
> individual
> packets will be placed into the TCP/IP frame.
> >
> >
> > Regards
> >
> > Zeng Puyang
> >
> > |:"f
> > |g-J +~7&!"\"fv7,1+a6Zy
> > _rj(}J&
> > **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
=====
Jerry Toomey of http://www.wansend.com can be reached at 949-439-4685
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