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Configuring the Primary Interface for the Routing Platform
The primary interface for
the routing platform has the following characteristics:
- It is the interface that packets go out when you type
a command such as ping 255.255.255.255—that is, a command that
does not include an interface name (there is no interface type-0/0/0.0 qualifier) and where the destination
address does not imply any particular outgoing interface.
- It is the interface on which multicast applications running
locally on the routing platform, such as Session Announcement Protocol
(SAP), do group joins by default.
- It is the interface from which the default local address
is derived for packets sourced out an unnumbered interface if there
are no non-127 addresses configured on the loopback interface, lo0.
By default, the multicast-capable interface with
the lowest-index address is chosen as the primary interface. If there
is no such interface, the point-to-point interface with the lowest
index address is chosen. Otherwise, any interface with an address
could be picked. In practice, this means that, on the routing platform,
the fxp0 interface is picked by default.
To configure a different interface to be the primary
interface, include the primary statement:
-
primary;
You can include this statement at the following
hierarchy levels:
-
[edit interfaces interface-name unit logical-unit-number family family]
-
[edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number family family]
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