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410 Nokia Network Voyager for IPSO 4.0 Reference Guide
For further details, refer to the confederations specification document (RFC 1965 as of this
writing).
AS1 has seven BGP-speaking routers grouped under different routing domains: RDI A, RDI B,
and RDI C. Instead of having a full-mesh connection among all seven routers, you can have a
full-meshed connection within just one routing domain.
EBGP Multihop Support
Connections between BGP speakers of different ASes are referred to as EBGP connections.
BGP enforces the rule that peer routers for EBGP connections need to be on a directly attached
network. If the peer routers are multiple hops away from each other or if multiple links are
between them, you can override this restriction by enabling the EBGP multihop feature. TCP
connections between EBGP peers are tied to the addresses of the outgoing interfaces. Therefore,
a single interface failure severs the session even if a viable path exists between the peers.
EBGP multihop support can provide redundancy so that an EBGP peer session persists even in
the event of an interface failure. Using an address assigned to the loopback interface for the
EBGP peering session ensures that the TCP connection stays up even if one of the links between
them is down, provided the peer loopback address is reachable. In addition, you can use EBGP
multihop support to balance the traffic among all links.
RDI A
RDI C
EBGP
CBGP
CBGP
RDI B
AS2 AS1
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