Networking Guide
Chapter 5, Configuring Internet Protocol (IP) routing
gated definition statements
gated definition statements
Definition statements are general configuration statements that relate to all of
gated or at least to more than one protocol.
The three definition statements are:
-
autonomoussystem
-
routerid
-
martians
The syntax for the
autonomoussystem definition statement is:
autonomoussystem autonomous_system ;
which sets the autonomous system number of this router
to be autonomous_system.
This option is required if BGP or EGP is in use. The AS number is
assigned by the Network Information Center (NIC).
The syntax for the routerid definition statement is:
routerid host ;
which sets the router identifier for use by the BGP
and OSPF protocols. The default is
the address of the first interface encountered by gated.
The address of a
non-point-to-point interface is preferred over the local address of a
point-to-point interface, and an address on a loopback interface that is not the
loopback address (127.0.0.1) is most preferred.
The syntax for the martians definition statement is:
martians {
host host [ allow ] ;
network [ allow ] ;
network mask mask [ allow ] ;
network masklen number [ allow ] ;
} ;
This definition statement defines a list of martian addresses about which
all routing information is
ignored. Sometimes a misconfigured system sends out obviously invalid
destination addresses. These invalid addresses, called martians, are rejected by
the routing software. This command allows additions to the list of martian
addresses. See
``gated route filtering''
for more information on
specifying ranges. Also, the allow parameter may be specified to explicitly
allow a subset of a range that was disallowed.
Following are some sample definition statements:
autonomoussystem 249 ;
martians {
0.0.0.26
};
The statements in the sample perform the following functions:
-
The autonomoussystem statement tells gated to use AS number 249 for
EGP and BGP.
-
The martians statement prevents routes to 0.0.0.26 from ever being
accepted.
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