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You cannot delete an address on a donor loopback interface while it is being
used as the preferred source address for an unnumbered Ethernet or demux
interface.
The router uses the preferred source address, if configured for an unnumbered
Ethernet or demux interface, in ARP requests and replies. ARP requests must
match the preferred source address.
For a configuration example that illustrates this feature, see "Example: Configuring
the Preferred Source Address for an Unnumbered Ethernet Interface" on page 196.
To display the preferred source address for an unnumbered Ethernet or demux
interface, use the
show interfaces
using this command, see the JUNOS Interfaces Command Reference.
Configuring Static Routes on Unnumbered Ethernet Interfaces
You can configure static routes on an unnumbered Ethernet interface. To do so, you
use the
qualified-next-hop
as the next-hop interface for a configured static route. This feature enables you to
specify independent preferences and metrics for static routes on a next-hop basis.
For a configuration example that illustrates this feature, see "Example: Configuring
an Unnumbered Ethernet Interface as the Next Hop for a Static Route" on page 197.
For information about how to specify an independent preference for a static route,
see the JUNOS Routing Protocols Configuration Guide.
Restrictions for Configuring Unnumbered Ethernet Interfaces
The following restrictions apply when you configure unnumbered Ethernet interfaces:
The
unnumbered-address
unnumbered Ethernet interfaces for IPv4 and IPv6 address families.
You cannot assign an IP address to an Ethernet interface that is already configured
as an unnumbered interface.
The donor interface for an unnumbered Ethernet interface must have one or
more configured IP addresses.
The donor interface for an unnumbered Ethernet interfaced cannot be configured
as unnumbered.
An unnumbered Ethernet interface does not support configuration of the following
statement options:
address
information about these options, see "Configuring the Interface Address" on
page 186.
Running IGMP and PIM are supported only on unnumbered Ethernet interfaces
that directly face the host and have no downstream PIM neighbors. IGMP and
PIM are not supported on unnumbered Ethernet interfaces that act as upstream
interfaces in a PIM topology.
Running OSPF and IS-IS on unnumbered Ethernet interfaces is not supported.
Chapter 5: Configuring Protocol Family and Interface Address Properties
operational mode command. For information about
statement to specify the unnumbered Ethernet interface
statement currently supports the configuration of
,
,
arp
broadcast
primary
Configuring an Unnumbered Interface
,
, and
. For
preferred
vrrp-group
195
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