IRDP

Su dung giao thuc ICMP de quang ba dia chi default-gateway vao trong mang LAN

R1 interface FastEthernet0/0  ip address 10.1.123.1 255.255.255.0  ip irdp  ip irdp address 10.1.123.254 100

R2 interface FastEthernet0/0  ip address 10.1.123.2 255.255.255.0  ip irdp  ip irdp address 10.1.123.253 101

R3 interface FastEthernet0/0  ip address 10.1.123.3 255.255.255.0  no ip route-cache  ! no ip routing ! ip gdp irdp