Hi All,
Im doing some lab test on GNS3 for DMVPN before go into real implementation. in here, we have Single DMVPN cloud with 2 HUBs. Note here, those two HUB not for redundancy purpose. They both located at different location and both serving different Web application to branches. So instead of creating 2 DMVPN cloud (1 for each HUB), I combined them in single DMVPN. Both Hub will talk each other via Point-toPoint Link. I purposely not include HUB1 to HUB2 connection in DMVPN. I have no problem on connectivity between SOPKE to Both HUB or SPOKE to SOPKE. Everything jus worked fine. But SOPKE sees two NHS server, and send request for NHRP mapping for to both of HUB , and both HUB also replies to the request. In such case, SPOKE2 sees SPOKE1 LAN IP via 2 available path, but gateway is SAME.Below is the output on SOPKE2. Why is it in this way? Can I make it HUB1 is the only NHS server, while having static NHRP mapping for HUB2 in SOPKE routers.?
SOPKE1 : 10.0.0.3 LAN: 172.16.30.0
SOPKE2: 10.0.0.4 LAN : 172.16.40.0
HUB1 : 10.0.0.1 LAN : 172.16.10.0
HUB2: 10.0.0.2 LAN : 172.16.20.0
SPOKE2#sho ip route eigrp
172.16.0.0/24 is subnetted, 4 subnets
D 172.16.30.0 [90/310172416] via 10.0.0.3, 00:01:57, Tunnel0
[90/310172416] via 10.0.0.3, 00:01:57, Tunnel0
D 172.16.20.0 [90/297372416] via 10.0.0.2, 00:07:41, Tunnel0
D 172.16.10.0 [90/297372416] via 10.0.0.1, 00:01:57, Tunnel0
SPOKE2#sho ip eig topo
P 10.0.0.0/24, 1 successors, FD is 297244416
via Connected, Tunnel0
via 10.0.0.1 (310044416/15299840), Tunnel0
P 172.16.40.0/24, 1 successors, FD is 128256
via Connected, Loopback0
P 172.16.30.0/24, 2 successors, FD is 310172416
10.0.0.3 via 10.0.0.1 (310172416/15427840), Tunnel0
10.0.0.3 via 10.0.0.2 (310172416/297372416), Tunnel0
P 172.16.20.0/24, 1 successors, FD is 297372416
via 10.0.0.2 (297372416/128256), Tunnel0
P 172.16.10.0/24, 1 successors, FD is 297372416
via 10.0.0.1 (297372416/128256), Tunnel0
Here is my HUB1 config:
HUB1#sho run int tun0
Building configuration...
Current configuration : 315 bytes
!
interface Tunnel0
bandwidth 1024
ip address 10.0.0.1 255.255.255.0
no ip redirects
no ip next-hop-self eigrp 100
ip nhrp authentication cisco
ip nhrp map multicast dynamic
ip nhrp network-id 123
no ip split-horizon eigrp 100
tunnel source FastEthernet0/0
tunnel mode gre multipoint
tunnel key 123
end
HUB2 Config:
HUB2#sho run int tun 0
Building configuration...
Current configuration : 299 bytes
!
interface Tunnel0
ip address 10.0.0.2 255.255.255.0
no ip redirects
no ip next-hop-self eigrp 100
ip nhrp authentication cisco
ip nhrp map multicast dynamic
ip nhrp network-id 123
no ip split-horizon eigrp 100
tunnel source FastEthernet0/0
tunnel mode gre multipoint
tunnel key 123
end
Here is one of SPOKE config:
SPOKE2#sho run int tun0
Building configuration...
Current configuration : 446 bytes
!
interface Tunnel0
ip address 10.0.0.4 255.255.255.0
no ip redirects
ip nhrp authentication cisco
ip nhrp map 10.0.0.1 192.168.10.1
ip nhrp map multicast 192.168.10.2
ip nhrp map 10.0.0.2 192.168.10.2
ip nhrp map multicast 192.168.10.1
ip nhrp network-id 123
ip nhrp holdtime 60
ip nhrp nhs 10.0.0.1
ip nhrp nhs 10.0.0.2
ip nhrp registration timeout 30
tunnel source FastEthernet0/0
tunnel mode gre multipoint
tunnel key 123
end
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Regards,
Nagis
