Datasheet

Lab – Configuring Frame Relay and Subinterfaces

Part 5: Configure a Frame Relay Subinterface

Frame Relay supports two types of subinterfaces: point-to-point and point-to-multipoint. Point-to-multipoint

subinterfaces support non-broadcast multiaccess topologies. For example, a hub and spoke topology would

use a point-to-multipoint subinterface. In Part 5, you will create a point-to-point subinterface.

Step 1: On the FR router, create new PVCs between R1 and R3.

FR(config)# interface s0/0/0

FR(config-if)# frame-relay route 113 interface s0/0/1 311

FR(config-if)# interface s0/0/1

FR(config-if)# frame-relay route 311 interface s0/0/0 113

Step 2: Create and configure a point-to-point subinterface on R1 and R3.

Note: Frame Relay encapsulation must be specified on the physical interface before subinterfaces can be

created.

a. Create subinterface 113 as a point-to-point interface on R1.

R1(config)# interface s0/0/0.113 point-to-point

R1(config-subif)# ip address 10.1.1.5 255.255.255.252

R1(config-subif)# ipv6 address 2001:db8:acad:d::1/64

R1(config-subif)# ipv6 address fe80::1 link-local

R1(config-subif)# frame-relay interface-dlci 113

R1(config-fr-dlci)#

b. Create subinterface 311 as a point-to-point subinterface on R3.

R3(config)# interface s0/0/1.311 point-to-point

R3(config-subif)# ip address 10.1.1.6 255.255.255.252

R3(config-subif)# ipv6 address 2001:db8:acad:d::3/64

R3(config-subif)# ipv6 address fe80::3 link-local

R3(config-subif)# frame-relay interface-dlci 311

R3(config-fr-dlci)#

c. Verify connectivity.

R1# ping 10.1.1.6

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.6, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/28/28 ms

R1# ping 2001:db8:acad:d::3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2001:DB8:ACAD:D::3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/28/28 ms

R3# ping 10.1.1.5

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.5, timeout is 2 seconds:

!!!!!