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What are the types of interfaces that can be used in Frame-Relay?
1 comments:
There are 3 ways to configure an interface to use frame-relay.
Physical Interface
Sub-Interface using Point-to-Point
Sub-Interface using Multipoint
Physical Interface - Frame-relay encapsulation can be configured on the physical interface and use muliple DLCIs. Routing updates recieved on the interface will not be sent out the same interface that it was recieved. This may cause issues with routing protocols
Subinterfaces were used to solve issues with split horizon. You cannot send out a routing update on the same interface that it was recieved.
Point-to-Point - Only supports one DLCI and uses frame-relay interface-dlci statement. Interface-DLCI is used to assign the DLCI to the interface. Multiple point-to-point subinterfaces are on different networks and do not share the same address space.
Example
interface serial 1/0
encapsulation frame-relay
no shut
interface serial 1/0.12 point-to-point
ip address 192.1.1.1 255.255.255.0
frame-relay interface-dlci 102
no shut
Multipoint - All nodes connected to a multipoint interface reside on the same network. Supports multiple DLCIs and uses the frame-relay map command.
Example
interface serial 1/0
encapsulation frame-relay
no shut
interface serial 1/0.12 multipoint
ip address 192.1.1.1 255.255.255.0
frame-relay map ip 192.1.1.1 102
frame-relay map ip 192.1.1.2 102 broadcast
frame-relay map ip 192.1.1.3 103 broadcast
no shut
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