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next hop, the static route will be installed in the routing table. R1 will ARP for
the next hop address. R2 will ignore the ARP Request because the source IP
address is not in a local subnet.
It is a misconfiguration to enable OSPF on both ends of an unnumbered
interface without setting the OSPF network type to point-to-point. Each
router will reject its neighbor's HELLOs because the source IP address is not
in a local subnet. Adjacencies never progress beyond the INIT state.
If three or more routers are connected to the same physical Ethernet and all
are configured to treat the Ethernet as a point-to-point link, adjacencies may
not form. The OSPF database description packets intended for a specific
neighbor will be processed by all neighbors, causing errors that reset
adjacencies.
Command History
Introduced in version 6.2.0.1 firmware.
Example
console(config-if-vlan1)#ip unnumbered 10.130.14.55
ip unnumbered gratuitous-arp accept
This command enables installation of a static interface route to the
unnumbered peer upon receiving a gratuitous ARP.
Syntax
ip unnumbered gratuitous-arp accept
no ip unnumbered gratuitous-arp accept
Default Configuration
The default mode is accept.
Command Mode
Interface (VLAN) Configuration
User Guidelines
IP unnumbered interfaces are supported in the default VRF only.
1479
Layer 3 Routing Commands
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