Connectivity Guide

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 satised, 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 that maps the MAC addresses to their corresponding IP addresses.
The ARP cache enables dynamically learned addresses to be removed after a time period you congure.
Congure static ARP entries
You can manually congure static entries in the ARP mapping table. Dynamic ARP is vulnerable to spoong. To avoid spoong, congure
static entries. Static entries take precedence over dynamic ARP entries.
1 Congure 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 in A.B.C.D format.
• 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.
Congure 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
Address Hardware address Interface Egress Interface
--------------------------------------------------------------
10.1.1.5 08:00:20:b7:bd:32 ethernet1/1/6 ethernet1/1/6
IPv4 routing commands
clear ip arp
Clears the dynamic ARP entries from a specic 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 — (Optional) Enter vrf then the name of the VRF to clear ARP entries corresponding to
that VRF.
• interface interface— (Optional) Specify an interface type:
– ethernet — Physical interface.
504 Layer 3