Bypass DMVPN shorcut routing for a spoke site

[darkbeer]

Hi all,

We have a working DMVPN network where we have temporary issues with an ISP in the path between two spokes. We like to bypass the spoke-to-spoke shortcut communication between Spoke A site and Spoke B site and let traffic run accross the hub/headend router. Is there an easy way to realize that?  I tried to install static route on Spoke A, saying that Spoke B network is routed to headed router, same vice versa on Spoke B, but that did not work...my ping results show that traffic goes straight from spoke A to spoke B...

[MHM Cisco World]

-Phase 1 no have spoke to spoke 

""Only static no dynamic tunnel""

-Phase 2 and phase3 you can make hub adjust the next-hop if you use eigrp.

MHM

[darkbeer]

Thanks Any chance to influence the next-hop when using BGP ??

[MHM Cisco World]

Sure' are you use ibgp or ebgp?

MHM

[darkbeer]

Its ibgp inside the DMVPN cloud, and eBGP between each site's LAN L3 switch and its DMVPN router.

[MHM Cisco World]

Can I see the config of bgp in hub and spoke 

MHM

[smithjohns40]

It's iBGP within the DMVPN cloud, and eBGP between each site's LAN L3 switch and its DMVPN router.

[balaji.bandi]

post the config here for the hub configuration and one of the spoke config.

ip nhrp redirect – This is what makes our DMVPN phase 3.  This allows the hub to tell spokes they can reach each other directly.

On the spoke -

ip nhrp shortcut  - enables the spoke to accept redirect messages issues by the hub. 

reference guide thinking that you are using IOS :

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nhrp/configuration/15-mt/nhrp-15-mt-book/nhrp-switch-enhancemts-dmvpn.html

Note : if you have several spoke this effect all spokes - are you looking only 2 spokes - Spoke A site and Spoke B ?

[darkbeer]

Yes we want only Spoke A and B to talk to each other via the hub router, all other 300 sites run fine with the Phase 3 Spoke2Spoke communication..

[balaji.bandi]

are you able to provide sample configuration of Hub and spoke a and b ?

[paul driver]

Hello
Change the spoke tunnel to be static and add a static mapping on the hub tunnel for that spoke>

Hub
interface Tunnel1
description DMVPN--Hub
ip nhrp map <spoke dmvpn ip>  <spoke PIP>

spoke
interface Tunnel1
description DMVPN-spoke
ip nhrp map <hub dmvpn ip>  <hub PIP>

tunnel source <spoke PIP>
tunnel destination <hub PIP>