External BGP. BGP configuration in which sessions are established between routers in different ASs.
edge router
In MPLS, a router located at the beginning or end of a label-switching tunnel. When at the beginning of a tunnel, an edge router applies labels to new packets entering the tunnel. When at the end of a tunnel, the edge router removes labels from packets exiting the tunnel.
See also [MPLS]
EGP
Exterior gateway protocol, such as BGP.
egress router
In MPLS, last router in a label-switched path (LSP).
See also [ingress router]
EIA
Electronic Industries Association. A United States trade group that represents manufacturers of electronics devices and sets standards and specifications.
EMI
Electromagnetic interference. Any electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronics or electrical equipment.
end system
In IS-IS, network entity that sends and receives packets.
ERO
Explicit route object. Extension to RSVP that allows an RSVP PATH message to traverse an explicit sequence of routers that is independent of conventional shortest-path IP routing.
explicit path
See [signaled path]
Explicit Route Object
See [ERO]
export
To place routes from the routing table into a routing protocol.
external BGP
See [EBGP]
external metric
A cost included in a route when OSPF exports route information from external autonomous systems. There are two types of external metrics: Type 1 and type 2. Type 1 external metrics are equivalent to the link-state metric; that is, the cost of the route, used in the internal autonomous system. Type 2 external metrics are greater than the cost of any path internal to the autonomous system.