DMVPN issue

[anilcisco]

HI,

I have an issue whereby The VPN tunnel between hub and spoke is up, but unable to pass data traffic. Can somebody assist me on how to troubleshoot the issue.

Dealer>sh dmvpn
Legend: Attrb --> S - Static, D - Dynamic, I - Incompletea
        N - NATed, L - Local, X - No Socket
        # Ent --> Number of NHRP entries with same NBMA peer

Tunnel0, Type:Spoke, NHRP Peers:1,
 # Ent  Peer NBMA Addr Peer Tunnel Add State  UpDn Tm Attrb
 ----- --------------- --------------- ----- -------- -----
     1   68.115.224.22    10.209.252.1    UP 00:18:49 S

Tunnel1, Type:Spoke, NHRP Peers:1,
 # Ent  Peer NBMA Addr Peer Tunnel Add State  UpDn Tm Attrb
 ----- --------------- --------------- ----- -------- -----
     1   68.115.224.23    10.209.248.1    UP 00:18:41 S

#show ip eigrp neighbors
IP-EIGRP neighbors for process 777
H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
1   10.209.252.1            Tu0               91 00:01:05    1  5000  2  0

[Rahul Kumar Mishra]

Make sure you have disabled eigrp split-horizon on your Hub router.

[anilcisco]

HI Rahul,

I do not see the option to disable this on the Hub router. Any other Suggestions how i can troubleshoot this issue,

Thanks,

Anil

[Rahul Kumar Mishra]

Can you share me your Hub router's configuration for tunnel interface, physical interface and eigrp. Split-horizon is an interface subcommand.

interface   name/number

no IP Split-Horizon EIGRP

[Rahul Kumar Mishra]

Hi Anil,

Can you share me diagram for same so that I can simulate the same and help you.

[Rahul Kumar Mishra]

Hi Anil,

Please run the following command on Hub router-

interface tunnel 0

no ip split-horizon eigrp 777

[anilcisco]

HI Rahul,

What are the consequences of applying this command, could this drop all the Other connections over the Tunnel. Also do you have a  number  where you can be reached to discuss my issue further,

Thanks,

Anil

[Rahul Kumar Mishra]

Hi Anil,

this will not drop other connections which are already going however spoke routers will receives routes of other spoke router if you enable this.

my number 01243065034
 

[anilcisco]

Hi Rahul,

Where are you located and if you are overseas do you have Viber or Tango so that i can call you,

Thanks,

Anil

[Rahul Kumar Mishra]

Please make the change and let me know the result.

[anilcisco]

HI Rahul.

Please see my Hub and spoke config below, there is a mismatch on the timer and am i right in saying that the mismatch will cause the Eigrp flapping. Also can you send me your email address as well. I have attached teh Logs,

Thanks,

Anil

[Rahul Kumar Mishra]

My email is rahul61185@gmail.com
 

[Rahul Kumar Mishra]

Also as per logs there is timers difference on both Hub and spoke router. Please correct the timers which should be common for each routers.  Also on hub router under tunnel interface configuration "tunnel mode gre multipoint" command is missing. Can you please fine tune all configuration mismatches?

[anilcisco]

Here's the config for the Tunnel interface on the Hub Router

interface Tunnel0
 description DMVPN Hub Primary Cloud
 bandwidth 10000
 ip vrf forwarding vpn
 ip address 10.209.252.1 255.255.252.0
 no ip redirects
 ip mtu 1400
 ip flow ingress
 ip bandwidth-percent eigrp 777 200
 ip hello-interval eigrp 777 20
 ip hold-time eigrp 777 100
 ip nhrp authentication bUq6Sgio
 ip nhrp map multicast dynamic
 ip nhrp network-id 1292170322
 ip nhrp holdtime 600
 ip nhrp max-send 1100 every 10
 ip tcp adjust-mss 1360
 tunnel source 68.115.224.22
 tunnel mode gre multipoint
 tunnel key 2350873894
 tunnel protection ipsec profile P1
!
interface Tunnel1
 no ip address
 hold-queue 4000 in
 hold-queue 1000 out