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	<title>debugall &#187; Common Errors</title>
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		<title>Lighting up a layer 2 trunk</title>
		<link>http://www.debugall.co.uk/2008/07/03/lighting-up-a-layer-2-trunk/</link>
		<comments>http://www.debugall.co.uk/2008/07/03/lighting-up-a-layer-2-trunk/#comments</comments>
		<pubDate>Thu, 03 Jul 2008 09:05:30 +0000</pubDate>
		<dc:creator>zismail</dc:creator>
				<category><![CDATA[Common Errors]]></category>
		<category><![CDATA[Ethernet]]></category>
		<category><![CDATA[Spanning Tree]]></category>
		<category><![CDATA[Trunk]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=20</guid>
		<description><![CDATA[I&#8217;ve seen this a number of times.  A user lights up a trunk and doesn&#8217;t restrict which VLANs can use the trunk, so Cisco IOS obviously allows all VLANs and this causes spanning tree to send a whole load of BPDUs to the remote device and if it has also been configured in a similar [...]]]></description>
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		<title>Etherchannel configurations &#8211; woops added the VLAN to the physical port.</title>
		<link>http://www.debugall.co.uk/2008/07/03/etherchannel-configurations-woops-added-the-vlan-to-the-physical-port/</link>
		<comments>http://www.debugall.co.uk/2008/07/03/etherchannel-configurations-woops-added-the-vlan-to-the-physical-port/#comments</comments>
		<pubDate>Thu, 03 Jul 2008 08:15:42 +0000</pubDate>
		<dc:creator>zismail</dc:creator>
				<category><![CDATA[Common Errors]]></category>
		<category><![CDATA[Etherchannel]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=19</guid>
		<description><![CDATA[Adding a VLAN to an Etherchannel How many times have you heard that someone added a VLAN to a phyiscal layer2 interface instead of the logical layer2 port-channel and subsequently brought the etherchannel down.  If your lucky you might get away with it.  I&#8217;ve seen engineers take down entire data centers as well as call [...]]]></description>
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