framerelay and ospf

S

Silver-0-surfer

Well-Known Member
Joined
Jan 5, 2008
Messages
317
Reaction score
7
Location
CPT
Hi guys

im studying for the icnd2 exam and im having some issues running ospf over a frame-relay connection.

My setup is this

R1 (s0/0) -> framerelay switch [dlci 101:201] <- R2 (s0/0)

R1 config is like this

R1(config-if)#encapsulation frame-relay
R1(config-if)#frame-relay map ip 10.0.0.2 101 broadcast
R1(config-if)#ip add 10.0.0.1 255.255.255.0
R1(config-if)#no shut
R1(config)#router ospf 1
R1(config-router)#network 10.0.0.0 0.0.0.255 area 0

R2 config

R2(config-if)#encapsulation frame-relay
R2(config-if)#frame-relay map ip 10.0.0.1 201 broadcast
R2(config-if)#ip add 10.0.0.2 255.255.255.0
R2(config-if)#no shut
R2(config)#router ospf 1
R2(config-router)#network 10.0.0.0 0.0.0.255 area 0

They can access each other

R1#ping 10.0.0.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.2, timeout is 2 seconds:
!!!!!

R2#ping 10.0.0.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.1, timeout is 2 seconds:
!!!!!

but the neighbors just will not form, as soon as i enable eigrp, the link forms (the topology table gets populated) but nothing in ospf.

I am missing something?
 
Lol, I remember something wrt to this but not the actual reason. The solution was simple though.

Got something to do with adjacency behavior maybe.

Edit: Frame Relay is a nonbroadcast network so normal routing & routed protocol broadcasts will not propagate across the cloud. Try adding ip ospf network broadcast to your interfaces or try alternatively use neighbor commands. Know the difference between using the two options.
 
Last edited:
Oh my heaven. I can't believe it!!! GENIUS!!!

The thing is I thought that adding

frame-relay map ip 10.0.0.1 201 broadcast
would enable broadcasts... Looks like I have some more research to do, strange that eigrp works off that bat though. Anyways thanks again.
 
ponder said:
Lol, I remember something wrt to this but not the actual reason. The solution was simple though.

Got something to do with adjacency behavior maybe.

Edit: Frame Relay is a nonbroadcast network so normal routing & routed protocol broadcasts will not propagate across the cloud. Try adding ip ospf network broadcast to your interfaces or try alternatively use neighbor commands. Know the difference between using the two options.
Click to expand...

Calling back the past, toppie?
 
Frame Relay does not support broadcasts, thus you have to set each ospf peer manually on each router.
 
You must log in or register to reply here.
Back
Top
Sign up to the MyBroadband newsletter
X