06-14-2011 12:14 PM - edited 03-07-2019 12:48 AM
Wha is the purpose of GRE tunnel IP address? What will be the cons of using IP unnumbered and the tunnel source as the loopback? I see that GRE keepalives use tunel source and destination addresses not the GRE tunnel IP anyway.
Solved! Go to Solution.
06-14-2011 12:59 PM
The tunnel address will be the ip addresses are the addresses that are used for routing over a tunnel. For instance, if you set up a tunnel between two sites and use loopback interfaces as source/destination interfaces, then when you route traffic over the tunnel, you the next hop will not be the ip address of the loopbacks, but instead the next hop would be the tunnel ip on the other end of the tunnel.
Tunnel addresses are just used to define the "virtual point to point" connection between two tunnel endpoints. Without them, then it's essentially switching over GRE.
Hope that helps.
06-14-2011 12:59 PM
The tunnel address will be the ip addresses are the addresses that are used for routing over a tunnel. For instance, if you set up a tunnel between two sites and use loopback interfaces as source/destination interfaces, then when you route traffic over the tunnel, you the next hop will not be the ip address of the loopbacks, but instead the next hop would be the tunnel ip on the other end of the tunnel.
Tunnel addresses are just used to define the "virtual point to point" connection between two tunnel endpoints. Without them, then it's essentially switching over GRE.
Hope that helps.
06-14-2011 01:11 PM
Thank you for your reply. So, if I already have routing protocols running with the loopback interface IPs and do not wish to run routing protocols over the GRE tunnels, as the only reason why I need the GRE is to control traffic ( policy routing to force some packets over the tunnel) so that the packets do not use the shortest path, then I will not need IP addresses for the tunnels, correct?
06-14-2011 01:50 PM
That is correct.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide