Connect 2 Networks that use Different Routing Protocols.

jskfan
jskfan used Ask the Experts™
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Connect 2 Networks that use Different Routing Protocols.

I would like to know in the case we have 2  separate Networks  , one runs OSPF and the other one runs EIGRP.  If I need those 2 networks to be able to talk to each other without using Redistribution nor MP BGP, would that be possible?  for Instance using VPN GRE Tunnel or IPSEC VPN Tunnel ..

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Distinguished Expert 2018

Commented:
If I need those 2 networks to be able to talk to each other without using Redistribution nor MP BGP, would that be possible?
If you think about exchanging routing information - No, it would not. Different protocols "talk" through redistribution.
Static routing is an option, but then protocols do not "talk" to each other (but network hosts would be able to forward packets to each other).
Kevin StockmarSr. Network Engineer

Commented:
The answer is dependent on what you mean by "talk". As JustinCase mentioned, the routing protocols won't talk with each other to exchange routing information because they require re-distribution. If you simply mean that you want IP connectivity, then you can setup a solution with static routes and/or VPN tunnels if the information needs to be encrypted.

Please elaborate on what you are trying to accomplish.

Author

Commented:
For Instance if we have 2 Sites , one  uses OSPF and the other uses EIGRP , both sites are connected as Site to Site VPN .
Can you do Route Redistribution between  2 sites or it is not necessary..?
Distinguished Expert 2018
Commented:
I am not sure why VPN is being mentioned... You can look at site to site VPN in this case as just another link - link is doing nothing by itself... It is just as connecting 2 routers by cable... Routes are needed to be able to forward traffic to other router...

If an interface is between OSPF and EIGRP routing protocols you will not be able to redistribute routes. For routes to be redistributed between OSPF and EIGRP both protocols must be present on the same router (or to have intermediate routing protocol (RIP, BGP, IS-IS) to do so, but still two routing protocols must be present on an redistribution router) .

So, to redistribute routes one of protocols had to be present on both edge routers (sending protocol control packets through VPN), otherwise if OSPF and EIGRP are strictly isolated on each location static route configuration is the only option.

Author

Commented:
Thank you Guys

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