
Configuring EGP Services
6-11
• Core
When the router is configured as a core gateway, the AS to which it belongs
acts as a transit AS. In the core mode, it can advertise and forward traffic to
networks reachable interior or exterior to its local AS.
The default gateway mode is core mode. If the EGP router is reconfigured to
run in noncore mode, the Site Manager automatically configures EGP export
route filters on that IP interface. This is done to suppress OSPF external routes
to EGP and the advertisement of any networks learned by EGP.
For More Information about EGP
For more information about EGP, refer to the following documentation:
Comer, Douglas E. Networking With TCP/IP, Volume I. 2d ed. Englewood Cliffs,
N.J.: Prentice-Hall Inc., 1991.
Mills, D. L. “Exterior Gateway Protocol Formal Specification.” RFC 904,
Network Information Center (NIC), SRI International, Menlo Park, California,
April 1984.
Perlman, Radia. Interconnections: Bridges and Routers. Reading, Massachusetts:
Addison-Wesley Publishing Company, 1992.
Rosen, Eric C. “Exterior Gateway Protocol (EGP).” RFC 827, Network
Information Center (NIC), SRI International, Menlo Park, California, October
1982.
EGP Implementation Notes
This section provides you with some important guidelines to follow when you
configure EGP. If you do not follow these guidelines, EGP will become disabled
on the interfaces involved.
• Autonomous system numbers must be between 1 and 65535.
• Two autonomous systems connected by an EGP link must have different
autonomous system numbers.
• The remote IP address cannot be the same as any of the local IP interface
addresses.
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