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New Member

Simple mGRE

I hoping some one can help me, I need to write a configure so that I can set up a tunnel between a static address router and a dynamic address router.

I know I need to use mGRE and NHRP but I can seem to get it working.

Don't suppose any one has a base level config for the static and the dynamic router just so I can atleast get the tunnel inplace.

All the Cisco guide keep over complicating things with IPSEC which I don't need or want.

Thanks in advance.

1 REPLY
New Member

Re: Simple mGRE

Try this:

On your Hub router:

int tunnel 0

     ip address 10.0.0.1 255.255.255.0 ! Change this as required

     tunnel source fa 0/0 ! or whatver interface you wish to use

     tunnel mode gre multipoint

     tunnel path-mtu-discovery

     ip nhrp auth Cisco123 ! change Cisco123 to whatever you like so long as you change it on all spokes as well

     ip nhrp network-id 1010 ! again 1010 can be changed as desired as long as the change is mirrored on the spokes

     ip nhrp map multicast dynamic

     no shut

     exit

router eigrp 1

     no auto-summary

     passive-interface default

     no passive-interface tunnel 0

     network 10.0.0.1 ! tunnel ip

     network 172.16.1.1 ! internal LAN

exit

On your Spoke router(s):

int tunnel 0

     ip address 10.0.0.2 255.255.255.0

     tunnel source fa 0/0 !again variable

     tunnel mode gre multipoint

     tunnel path-mtu-discovery

     ip nhrp nhs 10.0.0.1 !this points to the hub end of the tunnel

     ip nhrp auth Cisco123 !must match Hub auth string

     ip nhrp network-id 1010

     ip nhrp map 10.0.0.1 200.0.0.1 ! 200.0.0.1 = ip address of source interface on hub router, change accordingly

     ip nhrp map multicast dynamic

     no shut

router eigrp 1

     no auto-summary

     passive-interface default

     no passive-interface tunnel 0

     network 10.0.0.2 ! tunnel ip

     network 172.16.2.1 ! internal LAN ip

exit

Now have a cup of tea, a biscuit and a nice sit down.

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