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	<title>CCIE Notes</title>
	<link>http://daxm.net/ccienotes</link>
	<description>Technical notes gathered while studying for the CCIE certification.</description>
	<lastBuildDate>Mon, 15 Feb 2010 03:40:46 +0000</lastBuildDate>
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	<item>
		<title>Frame Relay</title>
		<description><![CDATA[&#8230; What is Frame Relay &#8230; Devices that &#8220;speak&#8221; Frame Relay fall into 1 of 2 categories:  data terminal equipment (DTE) or data circuit-terminating equipment (DCE). DTE equipment is at the customer premise and are usually the &#8220;user&#8221; end of the connection.  Think of terminals, PCs, routers. DCE equipment is the service provider end of [...]]]></description>
		<link>http://daxm.net/ccienotes/20100214/frame-relay</link>
			</item>
	<item>
		<title>FHRP &#8212; GLBP</title>
		<description><![CDATA[Gateway Load Balancing Protocol (GLBP) is a Cisco proprietary protocol to provide redundancy to LAN clients with only a &#8220;default gateway&#8221; as their routing option (so is HSRP but that is for a different post). GLBP uses the multicast address of 224.0.0.102 to communicate with GLBP enabled routers in the LAN.  A hello message is [...]]]></description>
		<link>http://daxm.net/ccienotes/20100209/fhrp-glbp</link>
			</item>
	<item>
		<title>Switchport Protected Command</title>
		<description><![CDATA[Similar to Private VLAN&#8217;s concept of an isolated VLAN is a command called Switchport Protected.  It is similar in that any interface that is in the same VLAN and is in &#8220;switchport protected&#8221; mode cannot see each other but can see other ports NOT in switchport protected mode that are in the same VLAN.  This [...]]]></description>
		<link>http://daxm.net/ccienotes/20100208/switchport-protected-command</link>
			</item>
	<item>
		<title>Private VLANs</title>
		<description><![CDATA[To help myself better understand private VLANs I created the following picture: Private VLANs are in two categories: Primary and Secondary. There can be only 1 primary VLAN per private VLAN.  When an interface is configured as a private VLAN promiscious port the primary VLAN is the &#8220;active&#8221; VLAN on that port.  This interface will [...]]]></description>
		<link>http://daxm.net/ccienotes/20100201/private-vlans</link>
			</item>
	<item>
		<title>Dynamic ARP Inspection (DAI)</title>
		<description><![CDATA[As mentioned in my previous post, here are my notes on DAI. To enable DAI all is needed is 1 command:  (config)#ip arp inspection vlan &#60;num&#62; HOWEVER there is so much behind this simple command it is scary. Unless additional parameters are configured DAI uses the DHCP snooping bindings table to know what IP-to-MAC-to-Interface mappings [...]]]></description>
		<link>http://daxm.net/ccienotes/20100131/dynamic-arp-inspection-dai</link>
			</item>
	<item>
		<title>DHCP Snooping</title>
		<description><![CDATA[DHCP snooping seems to me to be a strange security enhancement. Though I do agree that securing against a rogue DHCP server is important the way Cisco implements it is odd. In order for DHCP snooping to work at least 3 configurations are  needed: 1) Enable DHCP snooping on the switch &#8212; (config)#ip dhcp snooping [...]]]></description>
		<link>http://daxm.net/ccienotes/20100131/dhcp-snooping</link>
			</item>
	<item>
		<title>Spanning-tree Timers</title>
		<description><![CDATA[Quick note about STP timers: &#8211; STP timers are inherited from the root bridge. Therefore you only need to configure the timers on the root bridge and backup root bridge. &#8211; STP timers are configured per VLAN. Therefore if you want to configure the timers for all the vlans you&#8217;ll need to use the &#8216;vlan [...]]]></description>
		<link>http://daxm.net/ccienotes/20091208/spanning-tree-timers</link>
			</item>
	<item>
		<title>VLANs Traversing a Network</title>
		<description><![CDATA[Switches only process tagged frames for VLANs they are aware of.]]></description>
		<link>http://daxm.net/ccienotes/20091202/vlans-over-trunks</link>
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