Frame Relay – Point-to-Point (Subinterface)

You are the network administrator at Ranet Headquater,and have to configure the router “Ranet-HQ” to let Host1connect with Host2, Host3 and Host4 as below:

(Use console to config this router.)

1. Enable and set IP address on LAN interface to be thefirst IP of this subnet.

2. Enable serial interface, and create subinterface withFrame-Relay setting as below:

- s0/0/0.2 for connect with Ranet-BR2, via DLCI 902

- s0/0/0.3 for connect with Ranet-BR3, via DLCI 903

- s0/0/0.4 for connect with Ranet-BR4, via DLCI 904

All subinterfaces use CISCO standard for bothencapsulation and LMI, and set IP address to use the first IPin each subnet.

If everything is correct, Host1 should be able to connect

with Host2, Host3, and Host4.

Solution:

Ranet-HQ config:

(copy & paste these commands to Ranet-HQ router)

en

conf t

int fa0/0

no sh

ip add 172.20.8.1 255.255.255.240

int s0/0/0

no sh

encapsulation frame-relay

int s0/0/0.2 point-to-point

frame-relay interface-dlci 902

ip add 10.0.2.1 255.255.255.252

int s0/0/0.3 point-to-point

frame-relay interface-dlci 903

ip add 10.0.3.1 255.255.255.252

int s0/0/0.4 point-to-point

frame-relay interface-dlci 904

ip add 10.0.4.1 255.255.255.252

end

Ranet-HQ#sh frame-relay map 

Serial0/0/0.2 (up): point-to-point dlci, dlci 902, broadcast, status defined, active 

Serial0/0/0.3 (up): point-to-point dlci, dlci 903, broadcast, status defined, active 

Serial0/0/0.4 (up): point-to-point dlci, dlci 904, broadcast, status defined, active

 Ranet-HQ#ping 172.20.8.30 

Type escape sequence to abort. 

Sending 5, 100-byte ICMP Echos to 172.20.8.30, timeout is 2 seconds: 

.!!!! 

Success rate is 80 percent (4/5), round-trip min/avg/max = 4/9/12 ms 

Ranet-HQ#ping 172.20.8.40 

Type escape sequence to abort. 

Sending 5, 100-byte ICMP Echos to 172.20.8.40, timeout is 2 seconds: 

.!!!! 

Success rate is 80 percent (4/5), round-trip min/avg/max = 10/12/16 ms 

Ranet-HQ#ping 172.20.8.60 

Type escape sequence to abort. 

Sending 5, 100-byte ICMP Echos to 172.20.8.60, timeout is 2 seconds: 

.!!!! 

Success rate is 80 percent (4/5), round-trip min/avg/max = 11/12/13 ms 

Ranet-HQ#copy run start 

Destination filename [startup-config]? 

Building configuration… 

[OK] 

Ranet-HQ#

Everthing is ok!! Host1 should be able to connect with Host2, Host3, and Host4.

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