how to stop dynamically learned route on router - Eigrp

[ittechk4u1]

Hello Experts,

I have three  2 GRE Point to Point and one GRE DMVPn tunnel.

2 GREtunnel are not learnig all Dyanmic routes from HQ router but third GRE DMVPN tunnel is getting all dynamic routes uppdates! How can i stop it ?

Thanks

[Georg Pauwen · Accepted solution]

Hello,

not knowing what your configuration looks like exactly, typically making an interface passive keeps the interface from participating in the exchange of dynamic routing protocol information. E,g.:

router eigrp 1

passive interface Tunnel0

[ittechk4u1]

Thanks

[Giuseppe Larosa]

Hello ,

it depends on how are configured the EIGRP routers on the other side of each tunnel.

The two point to point tunnel are probably configured with a manual summarization of network 10.13/16.

The DMVPN tunnel is multipoint in nature: your device exchanges routing info only with the hub router, but it can learn prefixes that belong to other remote sites if the hub does not set itself as the next-hop

However, from the output you have provided the next-hop for all the prefixes within 10.13/16 is the same on tunnel599.

This might mean that the next-hop self is not disabled on the hub router.

In any case, the hub router of the DMVPN should not summarize to avoid defeating the dynamic spoke to spoke setup that is possible in DMVPN.

Most specific route is used so your outgoing traffic is going to use Tu599 for all the specific prefixes that are missing on the other two tunnels.

You could use a distribute-list in EIGRP to filter specific routes using a prefix-list.

But this is really what you want to do?

IF the 10.13/16 specific prefixes belong to the datacenter site only the other side can summarize, otherwise it should present you the effective next-hops. (in DMVPN phase 3 this is not needed as the hub can send you NHRP redirect messages).

Hope to help

Giuseppe