
Configuring IP Services
6-14 114065 Rev. A
Using the Circuitless IP Interface for a Peer-to-Peer Connection
In configuring a peer-to-peer connection for BGP speakers, you specify a local
peer address (the address of a local IP interface) and a remote peer address (the
address of a remote IP interface).
In situations where BGP speakers reside on routers that have multiple network
connections over multiple IP interfaces (the typical case for IBGP speakers),
consider using the address of the router’s circuitless IP interface as the local peer
address.
By using the address of the circuitless IP interface as the local peer address in an
IBGP configuration, you are ensuring that BGP is reachable as long as there is an
active circuit on the router.
Configuring BGP Peers over an Unnumbered Point-to-Point Link
A BGP peer-to-peer connection cannot be configured directly on an unnumbered
interface. To establish a connection, each side of the connection must be
associated with a numbered interface.
For example, consider the two routers in
Figure 6-3. Router A and Router B are
connected by a point-to-point network using unnumbered interfaces. Both routers
are configured with BGP.
Figure 6-3. BGP over an Unnumbered Point-to-point Link
Network 1
Point-to-Point
Network
Network 3
Router A
Router B
Numbered IP interface configured for a BGP
peer-to-peer connection
Unnumbered IP interface
Peer-to-Peer
Connection
Key
IP0049A
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