I have two Cisco 1921 Routers setup with a DMVPN. The tunnel comes up no problem and the routers exchange a new adjacency. However, the adjacency they form is for the tunnel network (172.16.0.0). On both routers, I have used the following network statements in the AS:
172.16.0.0 (tunnel interface)
x.x.x.x (local subnet)
The routers do not build an adjacency for each side's local subnet, only the the tunnel subnet. So communication obviously fails. If I create a static route on each router to route between local subnets, it only works from Spoke to Hub, not from Hub to spoke.
Why is EIGRP not forming the adjacency for the local subnet behind each router?
Thanks Franscesco. Show outputs are attached. As you can see, neighbors form on the tunnel interface, but EIGRP doesn't exchange routes for the 10.0.0.0 and 192.168.1.0 networks on each side.
Note: I put static routes in to try an achieve this but only the spoke is able to see the hub side. Not the other way around.
Thank-you. Yes I do realize that command is not necessary on the spoke. Was just trying everything to make it work.
I tested your config and it works good.
My spoke loopback is 10.30.30.1
DMVPN is up
Interface: Tunnel0, IPv4 NHRP Details
Type:Hub, NHRP Peers:1,
# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb
----- --------------- --------------- ----- -------- -----
1 188.8.131.52 172.16.0.2 UP 00:01:18 D
EIGRP is up
EIGRP-IPv4 Neighbors for AS(123)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 172.16.0.2 Tu0 11 00:01:50 6 100 0 3
My RIB has learned a subnet from EIGRP
HUB-RTR#sh ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is 100.100.100.1 to network 0.0.0.0
10.0.0.0/32 is subnetted, 2 subnets
D 10.30.30.1 [90/640000] via 172.16.0.2, 00:02:12, Tunnel0
I noticed you have the same loopback on both side when reading the config you've attached.
Can you change it on your spoke with 10.10.10.2 instead of 10.10.10.1
Yeah... I have this same config at about 6 other sites and it works fine. I tried your suggestion of changing IP address of Loopback. Unfortunately, no change... Any other thoughts?
Thanks for your help thus far.