Configuring Internet Protocol (IP) routing

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:

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 ( 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 {
The statements in the sample perform the following functions:

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SCO OpenServer Release 5.0.7 -- 11 February 2003