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    <title><![CDATA[Discussion on Look to the ARP Cache when troubleshooting flaky connectivity issues ]]></title>
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        <title><![CDATA[Update]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-347928-3493176]]></link>
        <description><![CDATA[I appreciate your comments and I did misput &quot;show mac-address-table&quot; when I meant &quot;show arp&quot;. Great catch!]]></description>
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        <dc:creator><![CDATA[jawright]]></dc:creator>
        <pubDate>Wed, 07 Sep 2011 13:20:05 -0700</pubDate>
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        <title><![CDATA[mac address table is not arp]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-347928-3493107]]></link>
        <description><![CDATA[The &quot;show mac-address-table&quot; command on Layer 2 switches maps mac addresses to switch ports.  It does not map ip addresses to mac addresses.  Still useful, but for a different purpose.  In a similar way, the arp table on a Layer 3 switch won't tell you what physical port the device is found on, just the vlan.]]></description>
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        <dc:creator><![CDATA[alan_stiver@...]]></dc:creator>
        <pubDate>Wed, 07 Sep 2011 11:23:02 -0700</pubDate>
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        <title><![CDATA[You forgot to mention...]]></title>
        <link><![CDATA[http://www.techrepublic.com/forum/discussions/102-347928-3493060]]></link>
        <description><![CDATA[When looking at the ARP cache, that the ARP cache is  only relevant to the local subnet.  Hosts that are reachable across a router in a different subnet are reached using the arp cache entry for the server's default gateway.Also, in the purest sense switches are layer 2 and ARP is a layer 3 protocol.  The &quot;show mac-address-table&quot; command does not show a switch's arp cache.  It shows the switch's forwarding table.  You will not find IP addresses listed in the output of this command.  In most layer 2 switches you will still find a &quot;show arp&quot; command but this will only show you the arp cache for the VLAN that the Management IP is a member of and it will only show you entries for hosts that have connected to the switch's Management IP.  You will not see all hosts in that VLAN.A layer 3 switch will use the same &quot;show arp&quot; command to show the arp cache and the &quot;show mac-address-table&quot; command to show the forwarding table.  Layer 3 switches may have more entries depending on how routing and the management VLANs are configured.]]></description>
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        <dc:creator><![CDATA[delphi9_1971@...]]></dc:creator>
        <pubDate>Wed, 07 Sep 2011 09:33:54 -0700</pubDate>
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