Re: Issue on NHRP Mapping

Hi,
If you are not considering spoke-to-spoke tunneling, point-to-point
tunneling should be fine at the spokes.

Niyi,
Have you initiated traffic that should trigger Next Hop Resolution?
The NHRP entries time out when not in use.
What messages do you have when you turn on nhrp debugs?

On 1/25/10, Gavin Schokman <Gavin.Schokman_at_nscglobal.com> wrote:
> Hi Niyi,
>
> Looks like your spoke config is setup for normal point-to-point GRE, not
> mGRE.
> Suggest you update the spoke config as follows:
>
> Tunnel at the spoke
> -----------------------------
> interface Tunnel10
> no tunnel destination 10.10.10.10
> tunnel mode gre multuipoint
>
> Kind regards,
> Gavin
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Olaniyi Sonubi
> Sent: 25 January 2010 11:46
> To: groupstudy
> Subject: Issue on NHRP Mapping
>
> Hello all,
>
> I am running DMVPN on my network with a 3800 router as the hub and about
> 170 spokes connecting to the hub. The NHRP mapping for some of the spoke
> sites is usually not completed. From the spoke side it resolves well as
> shown int the output of 'show ip nhrp'. But from the hub, the output of
> 'show ip nhrp'
> for those sites is usually blank. Below is some of my configs
>
> Tunnel at the hub
> -----------------------------
> interface Tunnel10
> description HQ DMVPN tunnel to branches bandwidth 2000000 ip address
> 10.204.10.1 255.255.255.0 no ip redirects ip mtu 1400 ip nhrp
> authentication xyz ip nhrp map multicast dynamic ip nhrp network-id 10
> ip tcp adjust-mss 1360 ip summary-address eigrp 10 172.31.0.0
> 255.255.0.0 5 ip summary-address eigrp 10 172.29.0.0 255.255.0.0 5 ip
> summary-address eigrp 10 172.28.0.0 255.255.0.0 5 ip summary-address
> eigrp 10 172.22.0.0 255.255.0.0 5 tunnel source 10.10.10.10 tunnel
> mode gre multipoint tunnel key 10 tunnel protection ipsec profile
> scpcprof end
>
> Tunnel at the spoke
> -----------------------------
> interface Tunnel10
> description DMVPN tunnel
> bandwidth 500
> ip address 10.204.10.91 255.255.255.0
> no ip redirects
> ip mtu 1400
> ip nhrp authentication xyz
> ip nhrp map multicast 10.10.10.10
> ip nhrp map 10.204.10.1 10.10.10.10
> ip nhrp network-id 10
> ip nhrp holdtime 60
> ip nhrp nhs 10.204.10.1
> ip nhrp registration timeout 30
> ip tcp adjust-mss 1360
> tunnel source 10.25.2.205
> tunnel destination 10.10.10.10
> tunnel key 10
> tunnel protection ipsec profile scpcprof end
>
> Spoke
> -----
> Spoke_Router#sh ip nh
> 10.204.10.1/32 via 10.204.10.1, Tunnel10 created 00:00:52, never expire
> Type: static, Flags: authoritative
> NBMA address: 10.10.10.10
>
> Hub
> ------
> Hub_Router#sh ip nh 10.204.10.91
> (Blank Output)
>
>
> What could be the problem?
>
> Thanks.
> 'Niyi
>
>
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-- 
Best Regards,
Tolulope.
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