BGP - definition of External BGP (eBGP)
External BGP or eBGP is implemented between BGP routers that are in different autonomous systems. There is no specialized command to implement an eBGP peering. An eBGP peering is characterized by the fact that the AS argument in the neighbor command is different than the AS of the router command. Note the following BGP configuration:
router bgp 2 bgp log-neighbor-changes neighbor 3.3.3.3 remote-as 3
This BGP router is in AS 2, and it is peering with a neighbor with a remote AS of 3. Thus, this is an eBGP peering.
This is in contrast to iBGP. For a general overview of the difference between the two, take a look at BGP internal vs external.
Links:
https://networklessons.com/bgp/how-to-configure-ebgp-external-bgp
Links to this page:
- BGP - definition of Internal BGP (iBGP)
- BGP - iBGP full-mesh peering
- BGP - multihop vs disable-connected-check
- BGP - next-hop-self vs update source
- BGP - oldest path attribute
- BGP - redistributing iBGP routes into an IGP
- BGP - remove private AS
- BGP Default local preference and its appearance in the BGP table
- BGP Influencing incoming traffic
- BGP Influencing outgoing traffic
- BGP Maximum Prefix Feature
- BGP dmzlink-bw feature
- BGP traffic engineering
- BGP which address is used as the next hop
- BGP
- DMVPN - Phase 2 BGP peerings
- MPLS - Using the BGP Allow-AS in feature
- Routing what if the administrative distance is the same