On Mon, 27 Apr 2015 10:02:49 -0400
John Marrett <jo...@zioncluster.ca> wrote:

> I'm using opennhrp to register with a Cisco hub router. in my Cisco
> configuration I use the option "ip nhrp registration no-unique" [1].
> this tells the hub that other devices registering can overwrite an
> existing registration. As my devices use dynamic IP addresses for
> some of their connections to the core it allows different devices to
> either change their NBMA IP or replace another existing NBMA address.
> 
> [1]
> http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr/command/iad-cr-book/ip_nat_source_through_iterate-ip-addrs.html#GUID-69654F06-92CF-4124-8BF0-A1B8BBA44B02
> 
> How can I configure this option with opennhrp?

I must've somehow missed this option. In map directive with
registration you can add 'cisco' to fix statically the packet
registration ids, so it'll purge the old registration first.

However, seems adding this bit is more appropriate. It's fairly simple
to toggle this bit.

Though, I'm not sure if Cisco is doing the right thing RFC wise by
*replacing* existing registrations. The rfc seems ambiguous whether the
registration with differing address should replace, or be added as
alternate mapping. Replacing the registration seems probably the
correct thing in dmvpn context. But protocol wise I'm slightly puzzled
with this.

In any case, it'd probably be good idea to add that.

/Timo

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