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dmvpn point-to-multipoint and ospf

ngo duyen
Level 1
Level 1

My company use dmvpn point-to-multipoint to connect from HQ to banch office with OSPF.

We have to migrate new ip plan for system because our DC is upgarding.

we config new tunnel for  the brach router and HQ router as below.

And the brach router and HQ router

have current tunnel 1 with the same config ( except: ip and tunnel key).

when we active both tunel, some banch office is hard to establish through OSFP.

when we use: " show ip ospf nei" in HQ router we see: INT status for long time (  10-> 30 minutes) before they change to FULL.

We try to use: clear ip ospf process or shut/no shut inter but It dont change for long time.

If we active only one tunnel, OSPF run well and change status: FULL very fast.

Could you tell me what happen?

thank you

HQ config

interface Tunnel2

description *Access WAN 2*

ip address 10.80.191.65 255.255.255.192

no ip redirects

ip nhrp authentication cisco

ip nhrp map multicast dynamic

ip nhrp network-id 2

ip nhrp holdtime 600

ip tcp adjust-mss 1400

ip ospf network point-to-multipoint

ip ospf priority 100

tunnel source ATM0/2/0

tunnel mode gre multipoint

tunnel key 2000

tunnel path-mtu-discovery

-------------------

banch config

interface Tunnel2

description *Access WAN 2*

ip address 10.80.191.70 255.255.255.192

no ip redirects

ip nhrp authentication cisco

ip nhrp map 10.80.191.65 172.19.2.53

ip nhrp map multicast 172.19.2.53

ip nhrp network-id 2

ip nhrp holdtime 600

ip nhrp nhs 10.80.191.65

ip tcp adjust-mss 1400

ip ospf network point-to-multipoint

ip ospf priority 0

tunnel source ATM0

tunnel mode gre multipoint

tunnel key 2000

tunnel path-mtu-discovery

1 Reply 1

Fabrizio Pedracini
Cisco Employee
Cisco Employee

Hi,

as you see INIT could be that the hello packets from the hub fail to reach some branches over the secondary tunnel. When you have the problem try to check "show ip nhrp" and "show ip nhrp multicast" on the HUB router and see if there's any difference between tunnel1 and tunnel2.

hope this helps,

Fabrizio

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