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Webcast-Catalyst9k
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Multipoint GRE and VRF

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

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New Member

Bump :)

Bump :)

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