OSPF issue/question

uneeqstylezz

**frame relay and OSPF working fine**
3 routers in total being used
R1= FRS (hub)
R2,R3 = spoke routers

Serial0 on FRS connects to R2
Serial1 on FRS connects to R3

on the FRS, I have set up a sub-interface under Serial1 as a point-to-point link for frame relay
from both R2 and R3, I am unable to ping the loopback or the ip address assigned to that sub interface.
i believe it is because i have no route on the FRS to direct frames from R2 or R3 to this sub interface?

is this possible?

smcclenaghan

I don't recall using subinterfaces when I set up this lab (on the FRS I mean, but I used them on the other two routers).

I don't think you should even be setting up an IP address on the FRS (if you did a similar lab as I did). I think the IPs are only configured on the subinterfaces of R2 and R3.

Can you paste your configs?

theodoxa

What he said. The Frame Relay Switch should not have any IP Addresses or subinterfaces. If I remember correctly

FRS(config)#frame-relay switching
FRS(config)#interface Serial0
FRS(config-if)#encapsulation frame-relay
FRS(config-if)#no ip address
FRS(config-if)#clock rate 64000
FRS(config-if)#frame-relay route 102 interface Serial1 101
FRS(config-if)#interface Serial1
FRS(config-if)#encapsulation frame-relay
FRS(config-if)#no ip address
FRS(config-if)#clock rate 64000
FRS(config-if)#frame-relay route 101 interface Serial0 102

frame-relay route <DLCI> interface <OUTGOING INTERFACE> <DLCI GOING IN THE OTHER DIRECTION>

Configuring a Cisco Router as a Frame Relay Switch > Cisco Frame Relay Configurations

uneeqstylezz

yes both of my serial interfaces on the FRS do not have an ip address assigned to them EXCEPT the sub interface.
i guess what i was trying to do was have the sub-interface be considered as another DTE/spoke router where it could be a neighbor in my OSPF config and have it set as a DROTHER.
ended up taking it off.
i guess you really need 4 routers instead of just 3 to do this?

theodoxa

I've read that you can use one router as both the Frame Relay Switch and a DTE, but in those examples two serial ports [on the same router] were connected together. I don't know if it would work with subinterfaces or not. You would probably need at least 4 serial ports on the FRS to pull this off.