"Billy Monroe" <[EMAIL PROTECTED]> wrote:
> I have done the configuration below. I can't ping my own S0 interface on
R1.
> R1-------Frame Switch (R2)-----------R3
The reason why you cannot ping your own interface is related to how ARP
works in a NBMA network environment. Frame Relay data-link layer addressing
is provided by a DLCI and you never have a DLCI to yourself, which is why
you are unable to resolve your own IP address to a DLCI in order to make a
successful ping. You may, if you desire, make a static mapping to your local
DLCI, although it is not necessary, nor is it important. Rather,
reachability of a remote device is important.
You should never ever need to resolve your own IP address, come to that,
although you should be able to reach the IP address on the remote router
serial interface, which should be resolved to a local DLCI number on your
serial interface.
The back-to-back configuration is entirely possible (and is moreover used in
several Cisco courses) and requires the following configuration:
R1 <-----DCE cable-----><-----DTE cable-----> R2
R1
! This is the necessary global frame-relay switching command
frame-relay switching
! This is the necessary configuration for the serial interface
interface serial 0
ip address 192.168.0.1 255.255.255.0
clockrate 256000
bandwidth 256
encapsulation frame-relay
frame-relay intf-type dce
frame-relay map ip 192.168.0.2 100 broadcast
R2
! This is the necessary configuration for the serial interface
interface serial 0
ip address 192.168.0.2 255.255.255.0
bandwidth 256
encapsulation frame-relay
! The following is an optional static mapping.
! Frame Relay Inverse ARP is automatic and will resolve IP/DLCI mappings
dynamically.
! The other end of the link is setup statically to provide the DLCI number
(100).
(frame-relay map ip 192.168.0.1 100 broadcast)
--
Edward Solomon
CCNA, CCSI
Senior I/T Specialist
Networking Solutions
IBM Canada Ltd. - Learning Services
Tel.: (905) 316-3241 Fax: (905) 316-3101
E-mail: [EMAIL PROTECTED]
Internet: http://www.can.ibm.com/services/learning/net_internet.html
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