OS10 Enterprise Edition User Guide Release 10.4.0E(R3)


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 08:00:20:b7:bd:32

View ARP entries

OS10# show ip arp interface ethernet 1/1/6
                                 interface ethernet1/1/6
                                 ip arp 08:00:20:b7:bd:32
                                 no shutdown

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