DMVPN phase 3 in GNS3 fine, real world not working

[digi076]

Hi all,

Within GNS3 I have succesfully created a DMVPN phase 3 topology with 1 HUB and 2 Spokes and all works well.

I'm building a DMVPN topology with "real routers" but I get stuck.
On the spoke there is no output with the "sh ip nhrp" command.

At least I should see the static mapping to the hub, right?

config on spoke:

interface Tunnel0
description DMVPN-SPOKE
ip address 10.0.1.2 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp authentication cisco123
ip nhrp map 10.0.1.1 x.x.x.x
ip nhrp map multicast x.x.x.x
ip nhrp holdtime 300
ip nhrp nhs 10.0.1.1
ip tcp adjust-mss 1360
tunnel source Vlan99
tunnel mode gre multipoint
tunnel key 101
!

the x.x.x.x. of course represent the NBMA address of the HUB.

any suggestions ?

thank you!

[Georg Pauwen]

Hello,

for phase 3, you need the command 'ip nhrp shortcut' on the spoke tunnel.

If adding that doesn't help, post the full configs of both hub and spoke.

[digi076]

hello Georg,

Tnx for your reply.

I've added the command, but still no joy.
here's the HUB config:

interface Tunnel0
 description DMVPN-HUB
 ip address 10.0.1.1 255.255.255.0
 no ip redirects
 ip mtu 1400
 no ip next-hop-self eigrp 90
 ip nhrp authentication cisco123
 ip nhrp map multicast dynamic
 ip nhrp network-id 101
 ip nhrp holdtime 300
 ip nhrp redirect
 ip tcp adjust-mss 1360
 tunnel source GigabitEthernet1
 tunnel mode gre multipoint
 tunnel key 101

[Georg Pauwen]

Hello,

I don't see:

no ip split-horizon eigrp 90

on the tunnel interface...? What does your topology look like, do you have several outgoing interfaces, or just GigabitEthernet1 ? If you have just one, you need the split-horizon...

[Sergey Lisitsin]

digi076,

Can you please show the output of show ip int brief from both spokes and from the hub.

[DSJ1]

Check whether DMVPN phase 2 working, if it works then shut all the tunnels and add ip nhrp redirect and shortcut accordingly to hub and spokes then no shut all the tunnels, it works for me.