From: Tomasz Szymanski (tomasz.szymanski@trecom.pl)
Date: Wed Jul 30 2003 - 14:54:15 GMT-3
Thank you Brian for your valuable reply
TS
Brian McGahan wrote:
>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
This archive was generated by hypermail 2.1.4 : Wed Aug 06 2003 - 06:52:59 GMT-3