Bay Networks 5390, Administering, Page: 312 / 888

A12-54 893-741-B
Internet Protocol (IP) Routing
Authenticating Outgoing Updates and Requests
If the Model 5390 server is configured for authentication, as described in Authenticating Incoming
RIP 2 Updates and Requests on page A12-46, the RIP 2 messages it sends to other routers carry
authentication information. When the Model 5390 server builds the RIP 2 message (update or
request), it sets the Address Family Identifier and Authentication Type fields in the message’s first
entry to 0xFFFF and 2, respectively. It also sets the Authentication field in the first entry to the value
of rip_auth (the authentication password configured for the Model 5390 server).
Advertising the Default Route
Initially, no default route is defined for the Model 5390 server so it cannot advertise one. If RIP
receives a default route in an update, the Model 5390 server learns, uses, and advertises that route.
However, a user-configured default route takes precedence over a learned one, and the Model 5390
server does not advertise a user-configured default route.
If you want the Model 5390 server to advertise itself as a default router over one or more interfaces,
set the rip_default_route parameter to an integer between 1 and 15 for the specific interfaces. This
integer specifies the metric the Model 5390 server advertises for itself as a route. Routers on the
directly connected network will use the Model 5390 server when they have no other route defined
for a particular destination.
After the Model 5390 server advertises itself as a default route, active RIP no longer advertises a
learned default route and instead advertises the route requested by the rip_default_route parameter.
However, for IP forwarding, the Model 5390 server still uses the default route (if any) specified via
the route command or defined in the configuration file.
NOTE:
RIP 1 updates and requests do not carry authentication infor-
mation.
NOTE:
The Model 5390 server need not have a default route itself in
order to advertise itself as a default router.
NOTE:
Creating or deleting a default route via the route command can
have unpredictable results and is discouraged except in special circum-
stances (see Risks When Adding or Deleting Default Routes on page
A12-45).