From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Jul 30 2003 - 14:31:43 GMT-3
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
>
>
>
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