DMVPN -PHASE I-Spokes not communicating with each other

[Cisconew]

I have done with my DMVPN Lab Phase I Configuration. I have found that Hub is able to learn routes of both spokes. But spoke is not able to learn route of other spoke(LAN).EIGRP enabled for Hub and spokes NBMA and LAN Networks.

Static default route is activated from hub and spoke towards SP Network. Please find below the topology image.

 Please find below my config. on Hub and Spoke Routers.

Hub:R11

interface Tunnel100
bandwidth 4000
ip address 192.168.100.11 255.255.255.0
no ip redirects
ip mtu 1400
no ip split-horizon eigrp 100
ip nhrp network-id 100
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/1
tunnel mode gre multipoint
tunnel key 100
end

router eigrp DMVPN

address-family ipv4 unicast autonomous-system 100

topology base
exit-af-topology
network 10.0.0.0
network 192.168.100.0
exit-address-family

Spoke-1-R31

interface Tunnel100
bandwidth 4000
ip address 192.168.100.31 255.255.255.0
ip mtu 1400
ip nhrp network-id 100
ip nhrp nhs 192.168.100.11 nbma 172.16.11.1 multicast
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/2
tunnel destination 172.16.11.1
tunnel key 100
end

Spoke-R41

interface Tunnel100
bandwidth 4000
ip address 192.168.100.41 255.255.255.0
ip mtu 1400
ip nhrp map 192.168.100.11 172.16.11.1
ip nhrp map multicast 172.16.11.1
ip nhrp network-id 100
ip nhrp nhs 192.168.100.11
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/3
tunnel destination 172.16.11.1
tunnel key 100
end

Please find below the extract of some show commands from Hub and Spoke.

Hub-R11#sh ip rou | b Gate
Gateway of last resort is 172.16.11.2 to network 0.0.0.0

S* 0.0.0.0/0 [1/0] via 172.16.11.2
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C 10.1.1.0/24 is directly connected, GigabitEthernet0/0
L 10.1.1.11/32 is directly connected, GigabitEthernet0/0
D 10.3.3.0/24 [90/26885120] via 192.168.100.31, 13:53:31, Tunnel100
D 10.4.4.0/24 [90/26885120] via 192.168.100.41, 13:53:02, Tunnel100
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.11.0/24 is directly connected, GigabitEthernet0/1
L 172.16.11.1/32 is directly connected, GigabitEthernet0/1
192.168.100.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.100.0/24 is directly connected, Tunnel100
L 192.168.100.11/32 is directly connected, Tunnel100

Spoke-R31#sh ip route | b Gate
Gateway of last resort is 172.16.31.2 to network 0.0.0.0

S* 0.0.0.0/0 [1/0] via 172.16.31.2
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
D 10.1.1.0/24 [90/26885120] via 192.168.100.11, 14:06:39, Tunnel100
C 10.3.3.0/24 is directly connected, GigabitEthernet0/0
L 10.3.3.31/32 is directly connected, GigabitEthernet0/0
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.31.0/24 is directly connected, GigabitEthernet0/2
L 172.16.31.1/32 is directly connected, GigabitEthernet0/2
192.168.100.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.100.0/24 is directly connected, Tunnel100
L 192.168.100.31/32 is directly connected, Tunnel100

Hub-R11#sh ip nhrp
192.168.100.31/32 via 192.168.100.31
Tunnel100 created 14:08:17, expire 00:08:03
Type: dynamic, Flags: registered nhop
NBMA address: 172.16.31.1192.168.100.41/32 via 192.168.100.41
Tunnel100 created 14:07:53, expire 00:08:44
Type: dynamic, Flags: registered nhop
NBMA address: 172.16.41.1

Spoke-2-R41#sh ip nhrp
192.168.100.11/32 via 192.168.100.11
Tunnel100 created 14:09:40, never expire
Type: static, Flags:
NBMA address: 172.16.11.1

Spoke-1-R31#sh ip nhrp
192.168.100.11/32 via 192.168.100.11
Tunnel100 created 14:11:21, never expire
Type: static, Flags:
NBMA address: 172.16.11.1

[balaji.bandi]

Try in EIGRP - no auto-summary

can you post full configuration - both HUB and Spoke  to cross check other settings.

[Cisconew]

It is already auto summary disabled in EIGRP.

I have attached Full configs. of Hub and spoke routers in txt. file.

[balaji.bandi]

thanks for the config, looks like the trick advised was working making all classic mode rather mixing.

[Georg Pauwen]

Hello,

make the changes marked in bold:

Hub:R11

interface Tunnel100
bandwidth 4000
ip address 192.168.100.11 255.255.255.0
no ip redirects
ip mtu 1400
no ip split-horizon eigrp 100
--> ip summary-address eigrp 100 10.0.0.0 255.0.0.0
--> ip nhrp map multicast
ip nhrp network-id 100
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/1
tunnel mode gre multipoint
tunnel key 100
end
!
--> router eigrp 100
--> network 10.0.0.0
--> network 192.168.100.0

Spoke-1-R31

interface Tunnel100
bandwidth 4000
ip address 192.168.100.31 255.255.255.0
ip mtu 1400
--> ip nhrp map 192.168.100.11 172.16.11.1
ip nhrp network-id 100
--> ip nhrp map multicast 172.16.11.1
--> ip nhrp nhs 192.168.100.11
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/2
tunnel destination 172.16.11.1
tunnel key 100
end

Spoke-R41

interface Tunnel100
bandwidth 4000
ip address 192.168.100.41 255.255.255.0
ip mtu 1400
ip nhrp map 192.168.100.11 172.16.11.1
ip nhrp map multicast 172.16.11.1
ip nhrp network-id 100
ip nhrp nhs 192.168.100.11
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/3
tunnel destination 172.16.11.1
tunnel key 100
end

[Cisconew]

I have changed the commands as you mentioned. But, it didn't work for me.

[Cisconew]

Hi,

Now i am able to ping other spoke and also summary route is added in Routing table.

But in CCNP Book i have found the explicit route for that network.Which command will change this behaviour.

The sh ip route excerpt from ccnp book for the spokes.

R31-Spoke# show ip route
! Output omitted for brevity
Gateway of last resort is 172.16.31.2 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 172.16.31.2
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
D 10.1.1.0/24 [90/26885120] via 192.168.100.11, 23:04:48, Tunnel100
C 10.3.3.0/24 is directly connected, GigabitEthernet0/2
D 10.4.4.0/24 [90/52992000] via 192.168.100.11, 23:04:23, Tunnel100
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.31.0/30 is directly connected, GigabitEthernet0/1
192.168.100.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.100.0/24 is directly connected, Tunnel100

R41-Spoke# show ip route
! Output omitted for brevity
Gateway of last resort is 172.16.41.2 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 172.16.41.2
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
D 10.1.1.0/24 [90/26885120] via 192.168.100.11, 23:05:01, Tunnel100
D 10.3.3.0/24 [90/52992000] via 192.168.100.11, 23:05:01, Tunnel100
C 10.4.4.0/24 is directly connected, GigabitEthernet0/2
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.41.0/24 is directly connected, GigabitEthernet0/1
192.168.100.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.100.0/24 is directly connected, Tunnel100

[Georg Pauwen · Accepted solution]

Hello,

use the configs below. I had problems before with EIGRP address families and DMVPN.

Spoke-R41

interface Tunnel100
bandwidth 4000
ip address 192.168.100.41 255.255.255.0
ip mtu 1400
ip nhrp map 192.168.100.11 172.16.11.1
ip nhrp map multicast 172.16.11.1
ip nhrp network-id 100
ip nhrp nhs 192.168.100.11
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/3
tunnel destination 172.16.11.1
tunnel key 100
!
interface GigabitEthernet0/0
ip address 10.4.4.41 255.255.255.0
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/3
ip address 172.16.41.1 255.255.255.0
duplex auto
speed auto
media-type rj-45
!
router eigrp 100
network 10.0.0.0
network 192.168.100.0
!
ip route 0.0.0.0 0.0.0.0 172.16.41.2

Spoke-R31

interface Tunnel100
bandwidth 4000
ip address 192.168.100.31 255.255.255.0
ip mtu 1400
ip nhrp map 192.168.100.11 172.16.11.1
ip nhrp map multicast 172.16.11.1
ip nhrp network-id 100
ip nhrp nhs 192.168.100.11
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/2
tunnel destination 172.16.11.1
tunnel key 100
!
interface GigabitEthernet0/0
ip address 10.3.3.31 255.255.255.0
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/2
ip address 172.16.31.1 255.255.255.0
duplex auto
speed auto
media-type rj45
!
router eigrp 100
network 10.0.0.0
network 192.168.100.0
!
ip route 0.0.0.0 0.0.0.0 172.16.31.2

Hub-R11

interface Tunnel100
bandwidth 4000
ip address 192.168.100.11 255.255.255.0
no ip redirects
ip mtu 1400
no ip split-horizon eigrp 100
ip nhrp network-id 100
ip nhrp map multicast dynamic
ip summary-address eigrp 100 10.0.0.0 255.0.0.0
ip tcp adjust-mss 1360
tunnel source GigabitEthernet0/1
tunnel mode gre multipoint
tunnel key 100
!
interface GigabitEthernet0/0
ip address 10.1.1.11 255.255.255.0
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/1
ip address 172.16.11.1 255.255.255.0
duplex auto
speed auto
media-type rj45
!
router eigrp 100
network 10.1.1.11 0.0.0.0
network 192.168.100.11 0.0.0.0
!
ip route 0.0.0.0 0.0.0.0 172.16.11.2

[Cisconew]

Thanks Georg,

Now it's working. Simply removed Named EIGRP Mode to classic mode and removed Ip summary address command from Hub Tunnel Interface.