BGP Multihop
- eBGP defaults to a TTL of 1
Useful to peer eBGP neighbors to loopbacks instead of Link IPs.
Topology
┌─────────── eBGP ────────────┐
▼ ▼
Lo0 Lo0
10.0.0.96/32 10.0.0.11/32
┌────────┐ ┌────────┐
│ R1 ├────────────────────┤ ISP │
│AS 64496│.0 .1│AS 64511│
└────────┘ 192.168.0.0/31 └────────┘
Config
!
! R1 needs some kind of route to know how to reach the loopback.
!
ip route 10.0.0.11 255.255.255.255 192.168.0.1
!
router bgp 64496
neighbor 10.0.0.11 remote-as 64511
neighbor 10.0.0.11 ebgp-multihop 2