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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