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New Member

ospf over Non-fully Meshed ATM

I'm configuring a non-fully meshed ATM net for a Client. Does anyone know or have a sample config. I looked the Cisco web site but couldn't find anything useful.

3640-HubRouter----17x2620 remote sites

Thanks

4 REPLIES
Cisco Employee

Re: ospf over Non-fully Meshed ATM

The easiest would be to configure the 3640 with a multipoint sub-interface under which you configure all the PVCs. The 2620 would use point-to-point sub-interfaces. Then, configure all sub-interfaces with "ip ospf network point-to-multipoint". All devices being in the same IP subnet. Configure then OSPF normally on each devices.

New Member

Re: ospf over Non-fully Meshed ATM

thanks for your advice, this is the config did so far for 3640 and 2600 routers.

3640-router

interface ATM2/0

no ip address

no atm ilmi-keepalive

!

interface ATM2/0.1 multipoint

ip address 10.0.61.2 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/201

protocol ip 10.0.61.3 broadcast

protocol ip 10.0.61.4 broadcast

protocol ip 10.0.61.5 broadcast

protocol ip 10.0.61.6 broadcast

protocol ip 10.0.61.7 broadcast

protocol ip 10.0.61.8 broadcast

protocol ip 10.0.61.9 broadcast

protocol ip 10.0.61.10 broadcast

protocol ip 10.0.61.11 broadcast

2600-router

interface ATM0/0

no ip address

no atm ilmi-keepalive

!

interface ATM0/0.1 point-to-point

ip address 10.0.61.3 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/202

protocol ip 10.0.61.2 broadcast

protocol ip 10.0.61.3 broadcast

Cisco Employee

Re: ospf over Non-fully Meshed ATM

The configurations are not really correct. On the 3600, for each remote 2600, you will need a separate PVC. The configs should be more like the following:

3640-router

interface ATM2/0

no ip address

no atm ilmi-keepalive

!

interface ATM2/0.1 multipoint

ip address 10.0.61.2 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/201

protocol ip 10.0.61.3 broadcast

pvc 1/202

protocol ip 10.0.61.4 broadcast

2600-router1

interface ATM0/0

no ip address

no atm ilmi-keepalive

!

interface ATM0/0.1 point-to-point

ip address 10.0.61.3 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/202 (*)

protocol ip 10.0.61.2 broadcast

2600-router2

interface ATM0/0

no ip address

no atm ilmi-keepalive

!

interface ATM0/0.1 point-to-point

ip address 10.0.61.4 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/203 (*)

protocol ip 10.0.61.2 broadcast

(*) the PVC assignements will depend on how the PVCs are configured within the ATM cloud.

New Member

Re: ospf over Non-fully Meshed ATM

Thanks once again, about the PVCs the Telco provider has allocated 17 "201-217 PVCS, one PVC per remote router. Considering this would the above config remain same or from the Cisco you assing one PVC for each remote 2600 i.e.

3640-router

interface ATM2/0

no ip address

no atm ilmi-keepalive

!

interface ATM2/0.1 multipoint

ip address 10.0.61.2 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/201

protocol ip 10.0.61.3 broadcast

pvc 1/202

protocol ip 10.0.61.4 broadcast

2600-router1

interface ATM0/0

no ip address

no atm ilmi-keepalive

!

interface ATM0/0.1 point-to-point

ip address 10.0.61.3 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/201

protocol ip 10.0.61.2 broadcast

2600-router2

interface ATM0/0

no ip address

no atm ilmi-keepalive

!

interface ATM0/0.1 point-to-point

ip address 10.0.61.4 255.255.255.0

ip ospf network point-to-multipoint

pvc 1/202

protocol ip 10.0.61.2 broadcast

and so on..........

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