From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Tue Dec 16 2003 - 19:39:36 GMT-3
Alec,
Frame Relay, HDLC, and SDLC do not provide reliable transport. In
the case that a packet is lost when sent across these encapsulations it is
the responsibility of the host to retransmit. For this reason the router
cannot guarantee to the host that the packet has gotten through (local
acknowledgement).
Local ack is only supported with TCP (reliable by nature) and Frame
Relay with an additional LLC2 header, which provides error checking and
retransmission.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 708-362-1418 (Outside the US and Canada)
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Pun, Alec CL
> Sent: Tuesday, December 16, 2003 10:34 AM
> To: ccielab@groupstudy.com
> Subject: DLSW pass-through
>
> From Doccd, the examples for DLSW direct and frame-relay encapsulation
> always use the pass-thru parameters. Why they are used to disable local
> acknolwedgement ? Isn't local acknolwedgement is more suitable as they
> offer
> more reliability ?
>
> [extract]
> dlsw remote-peer 0 frame-relay interface serial 1 40 pass-thru
> dlsw remote-peer 0 interface serial 1 pass-thru
>
> rgds,
> alec
>
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