Configuring Frame Relay Using Subinterfaces


Subinterfaces enable you to solve split-horizon problems and to create multiple PVCs on a single physical connection to the Frame Relay cloud.

Router(config)#int s 0/0

 

Router(config-if)#encapsulation frame-relay ietf

Sets the Frame Relay encapsulation type for all subinterfaces on this interface

Router(config-if)#frame-relay lmi-type ansi

Sets the LMI type for all subinterfaces on this interface

Router(config-if)#no ip address

Ensures there is no IP address set to this interface.

Router(config-if)#no shut

 

Router(config-if)#interface s 0/0.102 point-to-point

Creates a point-to-point subinterface numbered 102

Router(config-subif)#ip address 192.168.10.1 255.255.255.0

Assigns an IP address to the subinterface

Router(config-subif)#frame-relay interface-dlci 102

Assigns a DLCI to the subinterface

Router(config-subif)#int s 0/0.103 point-to-point

Creates a point-to-point subinterface numbered 103

Router(config-subif)#ip address 192.168.20.1 255.255.255.0

Assigns an IP address to the subinterface

Router(config-subif)#frame-relay interface-dlci 103

Assigns a DLCI to the subinterface

Router(config-subif)#exit

 

Router(config-if)#exit

 

Router(config)#

 


Note:

There are two types of subinterfaces:

  • Point-to-point, where a single PVC connects one router to another and each subinterface is in its own IP subnet.

  • Multipoint, where the router is the middle point of a group of routers. All other routers connect to each other through this router and all routers are in the same subnet.


Note:

Use the no ip split-horizon command to turn off split-horizon commands on multipoint interfaces so that remote sites can see each other.





CCNA Self-Study(c) CCNA Portable Command Guide
CCNA Portable Command Guide
ISBN: 1587201585
EAN: 2147483647
Year: 2006
Pages: 261
Authors: Scott Empson

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