HP-UX Routing Services Administrator's Guide HP-UX 11i v2, HP-UX 11i v3 (B2355-91153, November 2011)

/usr/sbin/ospfagt
gated must be running before ospfagt is started. Both gated and ospfagt must be running
to retrieve OSPF MIB objects.
To load the OSPF MIB, select Load/Unload SNMP:MIBS ... from the Options menu of
OpenView.
Configuring RDP
You can use Router Discovery Protocol (RDP), a standard protocol, to inform hosts of the presence
of routers to which they can send packets. You can also use RDP instead of host wiretapping routing
protocols (for example, RIP). It is used instead of, or in addition to, having statically configured
default routes in hosts.
RDP consists of two portions: the server portion, which runs on routers, and the client portion, which
runs on hosts. gated treats these portions as separate protocols; therefore, you can enable only
one of them at a time. These portions are described in detail in the subsequent sections.
For a description of the RDP configuration statements, type man 4 gated.conf at the HP-UX
prompt.
RDP Server
The RDP server runs on routers, and announces the routers’ existence to hosts periodically by
multicasting or broadcasting a router advertisement. The advertisement is sent over an RDP server
enabled physical interface. Each router advertisement contains a list of all addresses on a physical
interface and their preference for being used as a default router. You can configure the length of
time (the lifetime) for which addresses must remain on the list.
At first, router advertisements occur every few seconds, and then, they start occurring few minutes.
You can configure the minimum and maximum intervals for router advertisements to occur. Also,
a host can send a router solicitation, requesting an advertisement. The router responds with a
unicast router advertisement unless a multicast or broadcast advertisement is due to occur.
On hosts that support IP multicasting, router advertisements are sent by default to the all-hosts
mulicast address 224.0.0.1. You can also configuration RDP to use broadcasting to send router
advertisements. This is useful when a particular host does not support IP multicasting, or when one
or more hosts on an attached network do not support IP multicasting. If router advertisements are
sent to the all-hosts multicast address, or if an interface is configured for the limited-broadcast
address 255.255.255.255, the advertisements contain all the IP addresses configured on the
physical interface. If advertisements are sent to a net or subnet broadcast, only that network’s or
subnet’s address is included in the advertisement.
An example of the routerdiscovery server statement is as follows:
routerdiscovery server yes {
interface lan1 lan2
maxadvinterval 5 ;
address 193.2.1.17 193.2.1.33 193.2.1.46
broadcast
preference 50 ;
} ;
In the example, the server is enabled on the physical interfaces lan1 and lan2, and the IP
addresses 193.2.1.17, 193.2.1.33, and 193.2.1.46 are included in all the router advertisements.
Also, the addresses have a preference of 50.
RDP Client
The RDP client runs on hosts, listening for router advertisements over the all-hosts multicast address
224.0.0.1 (if it supports IP multicasting) or on the physical interface’s broadcast address (if the
host does not support multicasting). When a host starts up or is reconfigured, it sends certain router
solicitations requesting advertisements. When it sends the solicitations, it sends them to the all-routers
Configuring RDP 43