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TTL-Security and EBGP Multihop difference

TTL-Security

  External BGP neighbor may be up to 2 hops away.
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 253, Outgoing TTL 255

EBGP Multihop

  External BGP neighbor may be up to 2 hops away.
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 2

One of the good explain can read about TTL-Security at www.packetlife.net.

http://packetlife.net/blog/2009/nov/23/understanding-bgp-ttl-security/

If you want more explain pls go this website.
http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fs_btsh.html#wp1054580

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