From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Jul 21 2004 - 09:23:35 GMT-3
I thought some people would be glad to see this year old post from Brian M.
again.
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: "'Tomasz Szymanski'" <tomasz.szymanski@trecom.pl>;
<ccielab@groupstudy.com>
Sent: Wednesday, July 30, 2003 1:31 PM
Subject: RE: frame-relay map dlsw command?
> Tomasz,
>
> The different DLSw+ encapsulations can be grouped as follows:
>
> 1. Direct
> a. HDLC
> b. SDLC
> c. Frame-Relay
> i. pass-thru
> ii. DLSw+ Lite *
> 2. FST (IP)
> 3. TCP *
>
> The two encapsulations types that can provide local
> acknowledgement are DLSw+ Lite and TCP. The reason that the router can
> acknowledge packets on behalf of the destination station is because
> transport over the WAN is guaranteed while using one of these
> encapsulations.
>
> TCP is a reliable transport that supports resequencing and
> retransmissions. However, Frame-Relay by itself is not a reliable
> transport. If you want reliable transport over Frame-Relay, you must
> add an extra LLC2 header, which is a layer 2 reliable transport.
>
> Therefore, to use reliable transport with frame-relay through
> DLSw+ Lite, you must add a static protocol resolution for LLC2
> (Frame-Relay map llc2) if you are using a multipoint interface. If you
> are not using reliable transport, you would add the 'pass-thru' keyword
> on to the dlsw remote-peer statement, and add a frame-relay mapping
> statement for dlsw.
>
> The configs would be as follows:
>
> DLSw+ Lite:
> -----------
> dlsw local-peer peer-id 1.1.1.1
> dlsw remote-peer 0 frame-relay interface Serial0/0 102
> !
> interface Serial0/0
> encapsulation frame-relay
> frame-relay map llc2 102 broadcast
> end
>
> Rack1R1#sh dlsw peer
> Peers: state pkts_rx pkts_tx type drops ckts TCP
> uptime
> LLC2 Se0/0 102 CONNECT 4 4 conf 0 0 -
> 00:01:11
> Total number of connected peers: 1
> Total number of connections: 1
>
> Pass-thru:
> ----------
> dlsw local-peer peer-id 1.1.1.1
> dlsw remote-peer 0 frame-relay interface Serial0/0 102 pass-thru
> !
> interface Serial0/0
> encapsulation frame-relay
> frame-relay map dlsw 102 broadcast
> end
>
> Rack1R1#sh dlsw peer
> Peers: state pkts_rx pkts_tx type drops ckts TCP
> uptime
> IF Se0/0 102 CONNECT 2 2 conf 0 - -
> 00:00:15
> Total number of connected peers: 1
> Total number of connections: 1
>
>
>
>
> HTH
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
> Cell: 708-362-1418
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Tomasz Szymanski
> > Sent: Wednesday, July 30, 2003 7:23 AM
> > To: ccielab@groupstudy.com
> > Subject: frame-relay map dlsw command?
> >
> > Hi everyone!
> >
> > Does someone know what is the purpose of this command?
> >
> > I know that "frame-relay map llc2 <dlci> " is used for direct
> > encapsulation but I don't know purpose of the command in the subject.
> > Maybe someone does know when to use it?
> >
> > TS
> >
> >
> >
> _______________________________________________________________________
> > You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> _______________________________________________________________________
> You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Aug 01 2004 - 10:12:00 GMT-3