Reference Guide

example, if interface ethernet 1/1/5 has IP address on subnet 100.0.0.0/8, and if 10.1.1.0/24 recursively resolves to
100.1.1.1, the system installs the static route:
● When the interface goes down, OS10 withdraws the route.
● When the interface comes up, OS10 reinstalls the route.
● When the recursive resolution is broken, OS10 withdraws the route.
● When the recursive resolution is satisfied, OS10 reinstalls the route.
Address Resolution Protocol
Address Resolution Protocol (ARP) runs over Ethernet and enables end stations to learn the MAC addresses of neighbors on an
IP network. Using ARP, OS10 automatically updates the ARP cache table which maps the MAC addresses to their corresponding
IP addresses. The ARP cache enables dynamically learned addresses to be removed after a configured period.
Configure static ARP entries
You can manually configure static entries in the ARP mapping table. Dynamic ARP is vulnerable to spoofing. To avoid spoofing,
configure static entries. Static entries take precedence over dynamic ARP entries.
1. Configure an IP address and MAC address mapping for an interface in INTERFACE mode.
ip arp ip-address mac address
● ip-address—IP address in dotted decimal format—A.B.C.D.
● mac address—MAC address in nnnn.nnnn.nnnn format
These entries do not age, and you can only remove them manually. To remove a static ARP entry, use the no arp ip-
address command.
Configure static ARP entries
OS10(config)# interface ethernet 1/1/6
OS10(conf-if-eth1/1/6)# ip arp 10.1.1.5 08:00:20:b7:bd:32
View ARP entries
OS10# show ip arp interface ethernet 1/1/6
!
interface ethernet1/1/6
ip arp 10.1.1.5 08:00:20:b7:bd:32
no shutdown
!
IPv4 routing commands
clear ip arp
Clears the dynamic ARP entries from a specific interface or optionally delete (no-refresh) ARP entries from the content
addressable memory (CAM).
Syntax
clear ip arp [vrf vrf-name] [interface interface | ip ip-address] [no-
refresh]
Parameters
● vrf vrf-name — Enter the keyword vrf followed by the name of the VRF to clear ARP entries
corresponding to that VRF.
● interface interface— (Optional) Specify an interface type:
○ ethernet — Physical interface.
○ port-channel — Port-channel identifier.
○ vlan — VLAN identifier.
○ loopback — Loopback interface identifier.
● ip ip-address — (Optional) Specify the IP address of the ARP entry you want to clear.
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