User Manual

Enterasys X-Pedition User Reference Manual 149
Configuring Router Discovery
To display additional IP information, enter the following command in Enable mode:
Configuring Router Discovery
The router discovery server on the XP periodically sends out router advertisements to announce the
existence of the XP to other hosts. The router advertisements are multicast or broadcast to each
interface on the XP on which it is enabled and contain a list of the addresses on the interface and the
preference of each address for use as a default route for the interface. A host can also send a router
solicitation, to which the router discovery server on the XP will respond with a unicast router
advertisement.
On systems that support IP multicasting, router advertisements are sent to the ‘all-hosts’ multicast
address 224.0.0.1 by default. You can specify that broadcast be used, even if IP multicasting is
available. When router advertisements are sent to the all-hosts multicast address or an interface is
configured for the limited broadcast address 255.255.255.255, the router advertisement includes all
IP addresses configured on the physical interface. When router advertisements are sent to a net or
subnet broadcast, then only the address associated with the net or subnet is included.
To start router discovery on the XP, enter the following command in Configure mode:
The rdisc start command lets you start router discovery on the XP. When router discovery is
started, the XP multicasts or broadcasts periodic router advertisements on each configured
interface. The router advertisements contain a list of addresses on a given interface and the
preference of each address for use as the default route on the interface. By default, router discovery
is disabled.
The rdisc add address command lets you define addresses to be included in router advertisements.
If you configure this command, only the specified hostname(s) or IP address(es) are included in the
router advertisements. For example:
By default, all addresses on the interface are included in router advertisements sent by the XP. The
rdisc add interface command lets you enable router advertisement on an interface. For example:
Show ARP table entries.
arp show all
Show IP interface configuration.
interface show ip
Show DNS parameters.
system show dns
xp(config)# rdisc start
xp(config)# rdisc add address 10.10.5.254
xp(config)# rdisc add interface xp4