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mGRE in VRF & Source Interface problem

friends,

I have a scenario where in need to create multiple multipoint GRE tunnels and put them in VRF each for different customers.  But the problem i am facing is that i'm giving GRE Source Interface as Loopback of my Router which is in Global Table.    It works fine if i have One Tunnel only. But as soon as i create another Tunnel with same Source loopback interface.. Both tunnels goes down.    Can someone tell me why is this happening??  If i give different loopback as source interface to each tunnel . All tunnels stays up. But creating so many loopbacks doesn't seem scalable. 

 


BRASI#show run int tunnel 0
Building configuration...

Current configuration : 241 bytes
!
interface Tunnel0
 ip vrf forwarding RED
 ip address 10.0.0.1 255.255.255.0
 no ip redirects
 ip nhrp map 10.0.0.4 172.16.1.4
 ip nhrp map 10.0.0.5 172.16.1.5
 ip nhrp network-id 1
 tunnel source Loopback0
 tunnel mode gre multipoint
end

 

interface Tunnel1
 ip vrf forwarding BLUE
 ip address 11.0.0.1 255.255.255.0
 no ip redirects
 ip nhrp map 11.0.0.6 172.16.1.6
 ip nhrp network-id 2
 tunnel source Loopback0
 tunnel mode gre multipoint
end

 

interface FastEthernet0/0
 description *** Connected to Customers for mGRE ***
 ip address 172.16.1.1 255.255.255.0

 

 

interface Loopback0
 ip address 1.1.1.254 255.255.255.255
end

 

 

 

 

1 REPLY

Hello.I think "tunnel key xxx

Hello.

I think "tunnel key xxx" could help you.

You should assign unique value per tunnel. Surely spokes should have the same tunnel key[s] as Hub.

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