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New Member

Monitoring ATM interface if PVC is down

Hi,

I would like to monitor the ATM interfaces; which are connected as below:

__________________

{ }

OR1x1 ------ ATM Switch Cloud ------- OR1x2

{ }

OR2x1 ------ ATM Switch Cloud ------- OR2x2

{__________________}

The PA-A3-OC3 ATM interfaces we are using in Cisco 7206VXR router. We are having problem monitoring the ATM interfaces which are configured as PVC VBR-NRT.

If ATM PVC goes down then router ATM interface does not go down and because of this scenario the MHSRP does not work as it should work in the normal operation.

Is there any solution available to monitor the ATM PVC which allows the succesfull operation of MHSRP?

Thank you in advance.

Best Regards

Khan

5 REPLIES
Purple

Re: Monitoring ATM interface if PVC is down

Hi,

If you enable OAM on the ATM PVCs, the sub-interfaces (assuming you are using p2p sub-interfaces) will go down when the PVC goes down.

You can enable OAM using config similar to the following:

interface ATM1/0.32 point-to-point

ip address 10.1.1.1 255.255.255.0

pvc 1/32

vbr-rt 64 32 33

oam-pvc manage

encapsulation aal5snap

You can then enable HSRP tracking using:

standby 1 track atm 1/0.32

HTH,

Paresh

New Member

Re: Monitoring ATM interface if PVC is down

Dear Paresh,

Thank you for your reply; if I have the below mentioned configuration then can I include the OAM-PVC MANAGE command; or it has to be point-to-point configuration:

interface ATM4/0

description ATM4/0 J-R ATM24

ip address a.b.c.d 255.255.255.252

atm ilmi-keepalive

atm ilmi-pvc-discovery

pvc Group1 13/40

vbr-nrt 10000 10000 32

!

Your early response would be highly appreciated.

Best Regards

Khan

Purple

Re: Monitoring ATM interface if PVC is down

Hi,

You are obviously configuring the PVC under the main interface, which is a multi-point interface. By using OAM management on such an interface, the pvc on the router will go down if the actual PVC is down. However, it will not take the main ATM interface down with it.

If all you have is one PVC on this ATM interface, I suggest a config like below:

interface ATM4/0

no ip address

atm ilmi-keepalive

atm ilmi-pvc-discovery

!

interface ATM4/0.1 point-to-point

description ATM4/0 J-R ATM24

ip address a.b.c.d 255.255.255.252

pvc Group1 13/40

vbr-nrt 10000 10000 32

oam-pvc manage

Also make sure that your HSRP standby command references the new sub-interface and not the main ATM interface.

HTH,

Paresh.

New Member

Re: Monitoring ATM interface if PVC is down

Hello Paresh,

Thank you once again for your reply.

As suggested by you if we configure the above configuration does it shows the atm subinterface down if the PVC goes down?

Best Regards

Khan

Purple

Re: Monitoring ATM interface if PVC is down

Hi,

Yes, The sub-interface will definitely go down is the actual PVC is down. This is because your router will send OAM cells on this PVC and not get any back from the other end, causing it to bring down the p2p sub-interface.

Cheers,

Paresh.

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