Dear Ken and John
I really appreciate your discussion.
I really understood the concept of mapping between
subinterface and DLCI number.
I surly understood that in ptp connection, all the
router need to know is which DLCI number is associated
with given subinterface address.
However, what is still not clear to me is multipoint
connection.
In multipoint connection, there could several DLCI
number. Therefore, a specific DLCI number should be
associated with interface ip address.
Now, my question is which interface ip address should
be associated with local DLCI number between ip
address of subinterface in your site or ip address of
subinterface on remote site.
In ptp connection above, DLCI number was associated
with ip address of subinterface in your site (not
remote site).
According to the ciscopress book that I have, in
multipoint connection, a specific DLCI number was
associated with the ip address of interface on remote
site.
I am not sure if I asked clear question to be
understood. If you need more explanation regarding my
question, I am willing to send you back immediately.
Thanks in adv.
jeongwoo
--- John Dill <[EMAIL PROTECTED]> wrote:
> Dear Ken,
>
> Thanks for the followup. The reason for the change
> in the frame (dlci) map command is related to the
> fact that it is a point-to-point interface.
> Consider further:
>
> The purpose of the frame map statement is to
> explicitly map the L3 address to a L2 dlci number.
> On a multipoint interface, there may be several dlci
> numbers in play, so the particular dlci must be
> explicitly paired with a L3 address. However, on a
> point-to-point sub-interface there is only one dlci
> number. Once the dlci is known, the router can make
> the connection by considering the sub-interface's ip
> address and mask.
>
> If a packet is to be forwarded to the subnet defined
> by the IP address on a given ptp sub-interface, then
> it is mapped to the single dlci associated with this
> ptp link. All the router needs to know is what dlci
> is associated with this ptp sub-interface. It then
> has the info it needs to map L3 addresses to that
> dlci.
>
> HTH,
>
> John
>
> >>> "Claussen, Ken" <[EMAIL PROTECTED]>
> 10/18/00 08:42AM >>>
> After adding the Frame-relay Map statement, as
> suggested by several people,
> I was able to ping the local serial Interface. I
> then created the interface
> as a Sub-interface and attempted to use the
> Frame-relay map command and
> received the "You should use the Frame-Relay
> Interface-dlci" command from
> the router. When the Tnterface-dlci command was
> applied to the sub-interface
> (s0/0.1) IP traffic began passing back and forth on
> the serial link. I also
> had to add the appropriate static route to the
> default gateway, as
> suggested, so other clients on the development
> network (192.168.1.0) would
> know where to send traffic destined for the test
> network (192.168.3.0) or
> the Intermediate network (192.168.4.0). Routes had
> already been setup on the
> routers, but the default gateway did not know about
> the 192.168.4.0 network
> until I added the static route. After adding the
> route all traffic
> successfully was passed from all clients to the Test
> network via the
> intermediate successfully. I understand now why I
> had to assign the Map
> statement to the global interface, so that layer
> Layer 3 knows which layer 2
> interface to use, what I am still a little confused
> about is why the command
> changes when applied to a sub-interface to
> Frame-relay interface-dlci
> instead of Frame Relay Map IP. I appreciate all
> responses they all helped me
> to troubleshoot and understand the Frame Relay
> technology successfully,
> thank you.
>
>
> Ken Claussen MCSE CCA CCNA
> [EMAIL PROTECTED]
> "The mind is a terrible thing to waste!"
>
>
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