Frame Relay and Inverse ARP and ARP Frame Relay

From: Cisco Key (ciscokey@googlemail.com)
Date: Wed Oct 11 2006 - 17:10:22 ART

Hi all

Wonder if you can help me with the following problem:

Forgive me if this has been discussed before:

Scenario

                                Hub Router
                               / \
                              / \
                   Spoke Router-A Spoke Router-B

I have analysed the following:

If I disable inverse arp on Spoke Router B, I still get a dynamic mapping
from Spoke Router A on Spoke Router B but nothing for Spoke Router B that's
of course from a dynamic perspective!

So am I correct in saying when you disable inverse arp on a router it means
that the router will not map dynamic arp but will still receive a dynamic
mapping from its neighbour router.

Now am I correct in assuming if you want to disable inverse arp you will
have to do it on all routers

Secondly if you have static maps configured or point to point interfaces you
don't need to disable inverse arp
or
But should you have frame-relay interface-dlci configured and multipoint
interface or the default NBMA then you would need to disable inverse arp

Also if I may ask what does no arp frame-relay do as per my testing it had
no affect on any of the dynamic mappings

I know what arp frame-relay does by definition given a network protocol for
example IP the arp frame-relay command determines the corresponding hardware
address which would be a dlci for frame-relay

This is the same for normal arp but inverse arp is only used for example in
a bootp scenario whereby a device has a layer 2 address and asks for a layer
3 address same as frame relay inverse arp whereby you are a dlci layer 2 is
looking for a ip address to be mapped to

What scenario would no arp frame-relay do?

Apologies for the jabber but I need clarity

thanks for you assistance in advance

Best Regards

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