How to connect three routers directly in subinterface of LAN

[majed.balsharaf]

I need some help how we can make direct connect to two routers with same subinterface in LAN.

Example:

R1 interface f0/0.12 is connected to R2

and

R1 f0/0.13 is connected to R3

[Reza Sharifi · Accepted solution]

Majed,

In your diagram you have fa0/0 physically connected to both routers.  You cannot connect fa0/0 physically to one router and connect the same interface to a different router.

You can however have multiple sub-interface between 2 routers

on r1

example:

fa0/0.1

ip address 10.10.10.1/24

fa0/0.2

ip address 10.10.11.1/24

r2

fa0/0.1

ip address 10.10.10.2/24

fa0/0.2

ip address 10.10.11.2/24

with enca dot.1q on all sub-interfaces.

HTH

Reza