Sec11: Hub and spoke network, loopback

Hub and spoke network

Loopback in router

Int loopback10 //make loopback address

Ip address 11.1.1.1 255.255.255.0 //assign ip address

Exit

Show int loopback10

You can’t assign 127.x.x.x address because it’s dedicated to loopback. Although the interface you try to is loopback.

No int loopback 10 //delete loopback int

 

R2 to R3 need to go through R1. Round-trip time is doubled.

Debug ip packet // enable debug

Undebug all // disable debug mode

R3# ip route 2.2.2.2 255.255.255.255 172.12.123.1

When ping to 2.2.2.2, result is U.U.U

 

Ip route 0.0.0.0 .0.0.0.0 172.12.123.2 #Set default route to 172.12.123.2

Ref: Hub and spoke topology in packet tracer (http://freeccnalab.com/2013/10/27/ccna-packet-tracer-lab-understanding-frame-relay/)