packet tracer hub&spoke FR help.

[houserocka1]

This is my first post,pretty new to this whole area but i have been messing around in packet tracer with a hub and spoke frame relay but i cannot get it to work,cannot ping any machines or routers,i have included the packet tracer file if someone could shed some light on where i am going wrong i would be grateful.thanks.

[cadet alain]

Hi,

your FR hub and spoke topology is using physical interfaces and so you must have one subnet only, if you want multiple subnets you must use point-to-point subinterfaces on the spokes and point-to-multipoint on the hub.

Furthermore if you had left the physical interfaces and enabled OSPF you would have to change priority of spokes to 0 so they never become DR/BDR and statically define your neighbours on the hub with the neighbour command under router ospf.

Regards.

Alain.

[houserocka1]

Thanks for the reply i appreciate it, so what would be the best way to fix this problem then,if its not too much trouble.

[cadet alain · Accepted solution]

Hi,

I configured according to best practice ( all point-to-point subinterfaces)  see below for configuration file.

Regards.

alain.

[houserocka1]

Wow thanks ill take a look now and see what you did,Appreciate it.

[houserocka1]

Thanks for the help cadetalain,much appreciated, i configured the routers as you said and can now ping between the routers attached to the frame relay.That has given rise to a few more questions, packets seem to be getting lost throughout my networt for some reason,usually 50% loss,why would this be? Also i cannot ping past router 4 from the Lans attached to r5 and r6.Also all routers are supposed to be configured with OSPF,if i do this will i have to change anything,i included the updated network file if anyone can help with these issues it would be great.thanks again.

[cadet alain · Accepted solution]

i cannot ping past router 4 from the Lans attached to r5 and r6

Just enable OSPF on the Fastethernet interfaces of each router :

router os 1

net 172.16.85.xxx 0.0.0.0 a 0 where xxx is last octet of ip address of interface

packets seem to be getting lost throughout my networt for some reason,usually 50% loss

You have routing loops

on R1 just delete these static routes:

ip route 0.0.0.0 0.0.0.0 172.16.85.98

ip route 0.0.0.0 0.0.0.0 172.16.85.94

ip route 0.0.0.0 0.0.0.0 172.16.85.102

Also on R2 and R3 you must delete default routes and  enable OSPF on LAN or redistribute connected into ospf like this:

router os 1

redistribute connected subnets

And finally put a default route on ISP: ip route 0.0.0.0 0.0.0.0 172.16.85.89

Regards.

Alain.

[houserocka1]

thanks alain, i seemed to have fixed the problem by removing the default routes,now have full connectivity and 0 packet loss throughout the network,thanks alot you have been a great help.