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FTOS Configuration Guide for the C-Series - Force10 Networks

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ARP<br />

<strong>FTOS</strong> uses two <strong>for</strong>ms of address resolution: ARP and Proxy ARP.<br />

Address Resolution Protocol (ARP) runs over E<strong>the</strong>rnet and enables endstations to learn <strong>the</strong> MAC<br />

addresses of neighbors on an IP network. Over time, <strong>FTOS</strong> creates a <strong>for</strong>warding table mapping <strong>the</strong> MAC<br />

addresses to <strong>the</strong>ir corresponding IP address. This table is called <strong>the</strong> ARP Cache and dynamically learned<br />

addresses are removed after a defined period of time.<br />

For more in<strong>for</strong>mation on ARP, see RFC 826, An E<strong>the</strong>rnet Address Resolution Protocol.<br />

In <strong>FTOS</strong>, Proxy ARP enables hosts with knowledge of <strong>the</strong> network to accept and <strong>for</strong>ward packets from<br />

hosts that contain no knowledge of <strong>the</strong> network. Proxy ARP makes it possible <strong>for</strong> hosts to be ignorant of<br />

<strong>the</strong> network, including subnetting.<br />

For more in<strong>for</strong>mation on Proxy ARP, refer to RFC 925, Multi-LAN Address Resolution, and RFC 1027,<br />

Using ARP to Implement Transparent Subnet Gateways.<br />

<strong>Configuration</strong> Task List <strong>for</strong> ARP<br />

The following list includes configuration tasks <strong>for</strong> ARP:<br />

• Configure static ARP entries on page 322 (optional)<br />

• Enable Proxy ARP on page 323 (optional)<br />

• Clear ARP cache on page 323 (optional)<br />

For a complete listing of all ARP-related commands, refer to .<br />

Configure static ARP entries<br />

ARP dynamically maps <strong>the</strong> MAC and IP addresses, and while most network host support dynamic<br />

mapping, you can configure an ARP entry (called a static ARP) <strong>for</strong> <strong>the</strong> ARP cache.<br />

To configure a static ARP entry, use <strong>the</strong> following command in <strong>the</strong> CONFIGURATION mode:<br />

Command Syntax Command Mode Purpose<br />

arp ip-address mac-address interface CONFIGURATION Configure an IP address and MAC address<br />

mapping <strong>for</strong> an interface.<br />

• ip-address: IP address in dotted decimal<br />

<strong>for</strong>mat (A.B.C.D).<br />

• mac-address: MAC address in<br />

nnnn.nnnn.nnnn <strong>for</strong>mat<br />

• interface: enter <strong>the</strong> interface type slot/port<br />

in<strong>for</strong>mation.<br />

322 IP Addressing

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