Can mGre work with legacy P2P Gre ?

[Ahmed Mukhtar]

Hello all !

              I just want to know that can we use mGre with our legacy P2P Gre?

What if i configure mGre on the HUB side & P2P on the spoke side's of my network. Should it work?

[Philip D'Ath]

Yes, that is valid, for spoke to hub traffic.

All the tunnel interfaces need to be in the same subnet.

[Ahmed Mukhtar]

Thanks Philips ! for your prompt response !

Can you share me a sample configuration?

[Philip D'Ath · Accepted solution]

Sample hub configuration:

interface Tunnel1
 ip address 192.168.241.254 255.255.254.0
 tunnel source a.b.c.d
 tunnel mode gre multipoint
 tunnel key xxx
 ip nhrp authentication xxxx
 ip nhrp map multicast dynamic
 ip nhrp network-id xx
 ip nhrp nhs 192.168.247.1

Sample spoke configuration:

interface Tunnel5
 ip address 192.168.24x.xxx 255.255.254.0
 tunnel source e.f.g.h
 tunnel destination a.b.c.d
 tunnel key xxx
 ip nhrp authentication xxx
 ip nhrp map 192.168.241.254 a.b.c.d
 ip nhrp network-id xx
 ip nhrp nhs 192.168.241.254
 ip nhrp server-only

[Ahmed Mukhtar]

A bundle of thanks ! ! it worked !

just one thing, i dont think that the HUB should have the "ip nhrp nhs" command.. should it??

[Philip D'Ath]

You are correct.  It should not be needed.