Hi all
I'm been doing some experimenting with multipoint GRE over 3G and I've run into a problem I need some help with. My setup is best described with the attached network drawing. MAR-Router has a fiber Internet connection while the ECK-Router1 only has 3G connections using external modems with dynamic provider IPs, hence the need for multipoint GRE rather than static GRE tunnels. I've also had to use VRF lite on the ECK-Router1 as there is a need to keep the routing tables separate.
The tunnel9 interface on ECK-Router1 noVRF comes online nicely and OSPF does what it does. The tunnel can even handle when the 3G provider assign the modem a new IP. The tunnel 16 on ECK-Router1 VRF guest however does not handle nicely. When I set up the configuration the first time the tunnel comes up and OSPF goes adjacent with MAR-Router but whenever there is a disturbance in the 3G connection or the modem gets a new IP the tunnel goes down and doesn't activate until I remove and reenter the " tunnel vrf guest" command. The show dmvpn static detail command on ECK-Router1 gives the result below with the VRF guest tunnel in the NHRP state.
It seems multipoint GRE has a problem with VRF lite but it could also be a case where I've missed something. I would appreciate any pointers.
Regards
/Fredrik
ECK-Router1#sh dmvpn static det
Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete
N - NATed, L - Local, X - No Socket
# Ent --> Number of NHRP entries with same NBMA peer
NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting
UpDn Time --> Up or Down Time for a Tunnel
==========================================================================
Interface Tunnel9 is up/up, Addr. is 172.16.14.2, VRF ""
Tunnel Src./Dest. addr: 192.168.14.30/194.112.9.140, Tunnel VRF ""
Protocol/Transport: "GRE/IP", Protect ""
Interface State Control: Disabled
nhrp event-publisher : Disabled
IPv4 NHS:
172.16.14.1 RE priority = 0 cluster = 0
Type:Spoke, Total NBMA Peers (v4/v6): 1
# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb Target Network
----- --------------- --------------- ----- -------- ----- -----------------
1 194.112.9.140 172.16.14.1 UP 00:02:46 S 172.16.14.1/32
Interface Tunnel16 is up/up, Addr. is 172.16.14.3, VRF "guest"
Tunnel Src./Dest. addr: 192.168.15.30/194.112.9.140, Tunnel VRF "guest"
Protocol/Transport: "GRE/IP", Protect ""
Interface State Control: Disabled
nhrp event-publisher : Disabled
IPv4 NHS:
172.16.14.1 E priority = 0 cluster = 0
Type:Spoke, Total NBMA Peers (v4/v6): 1
# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb Target Network
----- --------------- --------------- ----- -------- ----- -----------------
1 194.112.9.140 172.16.14.1 NHRP 00:00:45 S 172.16.14.1/32 (guest)
ECK-Router1
interface Tunnel9
bandwidth 10000
ip address 172.16.14.2 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp map multicast 194.112.9.140
ip nhrp map 172.16.14.1 194.112.9.140
ip nhrp network-id 1
ip nhrp holdtime 60
ip nhrp nhs 172.16.14.1
ip ospf network non-broadcast
ip ospf dead-interval 4
ip ospf hello-interval 1
ip ospf priority 0
ip ospf 1 area 0
ip ospf cost 2
tunnel source GigabitEthernet0/0.807
tunnel mode gre multipoint
interface Tunnel16
bandwidth 10000
ip vrf forwarding guest
ip address 172.16.14.3 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp map multicast dynamic
ip nhrp map multicast 194.112.9.140
ip nhrp map 172.16.14.1 194.112.9.140
ip nhrp network-id 1
ip nhrp holdtime 60
ip nhrp nhs 172.16.14.1
ip ospf network non-broadcast
ip ospf dead-interval 4
ip ospf hello-interval 1
ip ospf priority 0
ip ospf 10 area 0
ip ospf cost 2
tunnel source GigabitEthernet0/0.810
tunnel mode gre multipoint
tunnel vrf guest
interface GigabitEthernet0/0.807
encapsulation dot1Q 807
ip address 192.168.14.30 255.255.255.0
!
interface GigabitEthernet0/0.810
encapsulation dot1Q 810
ip vrf forwarding guest
ip address 192.168.15.30 255.255.255.0
MAR-Router
interface Tunnel9
bandwidth 10000
ip address 172.16.14.1 255.255.255.0
no ip redirects
ip mtu 1400
ip nhrp map multicast dynamic
ip nhrp network-id 1
ip nhrp holdtime 60
ip ospf network broadcast
ip ospf dead-interval 4
ip ospf hello-interval 1
ip ospf priority 255
ip ospf 1 area 0
ip ospf cost 2
tunnel source 194.112.9.140
tunnel mode gre multipoint
