![]() Underlying Code MUST be Doing Something Additional When we Set TTL of 2 If I literally needto change the TTL from the eBGP default of 1 to a TTL of 2 for the two IP addresses to even reach each other, then they must not be directly connected. Question: If I needa TTL of 2 for successful eBGP peering between R1 and R3 whether via loopback or physical then can it even be in the realm of possibility that they are directly connected? If I NEED to Set TTL of 2 for R1 and R3 to BGP Ping or Even Ping, Can They Be Directly Connected? A TTL of 2 would be needed to eBGP peer between R1 and R3.A TTL of 2 would be needed to ping R3 from R1.For our eBGP peering between R1 and R3 back in beginning we knew two things Well it basically seems to indicate, in the above documentation, that the default behavior is to check to see if the neighbors are directly connected. So if it isn’t TTL that “fails,” then what? If the default behavior is that only directly connected neighbors are “ allowed,” this would mean that some type of check happens that realizes that R1’s loopback and R2’s loopback are not directly connected to each other and the attempted eBGP connection must, then, by default fail. The documentation says that, by default, without this command ( ebgp-multihop) that for eBGP “ only directly connected neighbors are allowed.” By Default, Only Directed Connected Neighbors are Allowed Question: Is R1’s loopback directly connected to R2’s loopback?Īnswer: No. So this command says that it will help connect eBGP peers “ residing on networks that are not directly connected.” Let’s do a quick google search for neighbor ebgp-multihop. The truth is we actually don’t “need” to. Since R1 and R2 only need a TTL of 1 to get between their respective loopbacks, why do we “ need” to set eBGP multihop to 2 for R1 and R2 for eBGP to work? TTL of 3 is sufficient to reach R3’s loopback addressĪs you can see below… all those pings were successful.TTL of 2 is sufficient to reach R2’s loopback address. ![]()
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