ISIS with DMVPn

Unanswered Question
Apr 19th, 2009
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Hi,


I am trying to reproduce a scenario to implement at a customer. in short I would like to run ISIS routing over DMVPN tunnels.

with much troubleshooting, I discovered that the soonest I enable tunnel mode gre multipoint the isis routing give and error. (ISIS-Adj: Point-to-point IIH received on multi-point interface: ignored IIH) here is an example of one router cfg.


interface Loopback1

ip address 192.168.247.1 255.255.255.0

interface Tunnel0

bandwidth 1024

ip address 10.10.30.1 255.255.255.0

ip mtu 1500

ip router isis

ip nhrp authentication bajdmvpn

ip nhrp map multicast 192.168.247.2

ip nhrp map 10.10.30.2 192.168.247.2

ip nhrp network-id 100000

ip nhrp holdtime 300

ip nhrp nhs 10.10.30.2

ip nhrp cache non-authoritative

qos pre-classify

cdp enable

tunnel source Loopback1

tunnel mode gre multipoint

tunnel key 100000

ip router isis

router isis

net 49.0001.1921.6824.7001.00

is-type level-2-only

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Giuseppe Larosa Fri, 04/24/2009 - 11:00
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Hello Hani,

I'm afraid that IS-IS is not supported over DMVPN.

the reason for this is that IS-IS packets are not IP packets but totally different.


So the NHRP protocol that helps to resolve ip addresses over the NBMA cannot help in building the IS-IS adjacencies.


So even if you change the IS-IS network type to point-to-point you would be limited to only two devices


see

http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_is1.html#wp1014264


Actually you should be able to choice between:

EIGRP, OSPF or BGP.


see


http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/DMVPN_2_Phase2.html#wpxref46836


Hope to help

Giuseppe


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