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serial interface

If I have 2 routers joined by serial cables, are these routers classed as directly connected ? and if so can I ping the other router without any route, Do they have to be on the same ip before I can ping it ?

1 REPLY

Re: serial interface

Yes, they are directly connected.

To be able to set this correctly you'll need to set the same subnet on both sides:

router-A#

int s0/0

ip address 150.x.x.x.255.255.252

router-B#

int s0/0

ip address 150.x.x.x.255.255.252

you dont need to configure routing protocols.

as you'd have something like the followin in both routers:

R1#sir

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

150.50.0.0/30 is subnetted, 3 subnets

C 150.50.10.0 is directly connected, serial0

So to ping the other side it will just send an ARP request and get the MAC for the other router.

Ping will go directly!

Vlad

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