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 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 - BGP Algorithm within confederations
- BGP - Handling Multiple Communities on a Single Route
- BGP - Loop Prevention
- BGP - TCP Peering Session Process
- BGP - aggregate-address with a single subnet
- BGP - definition of Internal BGP (iBGP)
- BGP - eBGP peerings
- BGP - iBGP full-mesh peering
- BGP - next-hop-self vs update source
- BGP - redistributing iBGP routes into an IGP
- BGP - remove private AS
- BGP Default local preference and its appearance in the BGP table
- BGP Influence incoming traffic
- BGP Maximum Prefix Feature
- BGP Path Selection Oldest Path
- BGP dmzlink-bw feature
- BGP influence Outgoing Traffic
- BGP multihop vs disable-connected-check
- 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
- MPLS L3 VPNs and the interaction between AS-Override and SoO
- Network Design - Choosing a technology for multiple datacenter topology
- Routing what if the administrative distance is the same