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	<title>debugall &#187; MPLS</title>
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		<title>Multicast VPN</title>
		<link>http://www.debugall.co.uk/2011/06/27/multicast-vpn/</link>
		<comments>http://www.debugall.co.uk/2011/06/27/multicast-vpn/#comments</comments>
		<pubDate>Mon, 27 Jun 2011 06:33:20 +0000</pubDate>
		<dc:creator>Zarar</dc:creator>
				<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[MPLS VPN]]></category>
		<category><![CDATA[Multicast]]></category>
		<category><![CDATA[MVPN]]></category>
		<category><![CDATA[PIM-SM]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=781</guid>
		<description><![CDATA[PIM-SM, PIM-SSM, and PIM-BIDIR are all supported inside the provider core for MVPN. PIM-SM or PIM-SSM is the recommended PIM option in the provider core, because PIM-BIDIR is not yet supported by all platforms, PIM-SM, PIM-SSM, PIM-BIDIR and PIM-DENSE-MODE are supported inside the MVPN. MVPN has the concepts of Multicast Distribution Trees (MDT). An MDT [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Inter-AS Option B &#8211; Revisited</title>
		<link>http://www.debugall.co.uk/2009/08/22/inter-as-option-b-revisited/</link>
		<comments>http://www.debugall.co.uk/2009/08/22/inter-as-option-b-revisited/#comments</comments>
		<pubDate>Sat, 22 Aug 2009 11:36:25 +0000</pubDate>
		<dc:creator>Zarar</dc:creator>
				<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[Inter-AS]]></category>
		<category><![CDATA[iPhone]]></category>
		<category><![CDATA[MPLS VPN]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=799</guid>
		<description><![CDATA[Consider the topology below. Watch the video below or download and watch it on your iphone.]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Frame-Relay to VLAN Interworking &#8211; AToM</title>
		<link>http://www.debugall.co.uk/2009/08/03/frame-relay-to-vlan-interworking-atom/</link>
		<comments>http://www.debugall.co.uk/2009/08/03/frame-relay-to-vlan-interworking-atom/#comments</comments>
		<pubDate>Mon, 03 Aug 2009 04:37:40 +0000</pubDate>
		<dc:creator>Zarar</dc:creator>
				<category><![CDATA[AToM]]></category>
		<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[iPhone]]></category>
		<category><![CDATA[iPod]]></category>
		<category><![CDATA[MPLS]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=770</guid>
		<description><![CDATA[Consider the topology below. Watch the video below or download and watch it on your ipod or iphone. The commands used in the above video can be found below. PE1 ! hostname PE1 ! frame-relay switching ! mpls ldp router-id Loopback0 force mpls label protocol ldp ! pseudowire-class ZARAR encapsulation mpls interworking ip ! interface [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>6PE &#8211; IPv6 over MPLS</title>
		<link>http://www.debugall.co.uk/2009/02/28/6pe-ipv6-over-mpls/</link>
		<comments>http://www.debugall.co.uk/2009/02/28/6pe-ipv6-over-mpls/#comments</comments>
		<pubDate>Sat, 28 Feb 2009 06:43:59 +0000</pubDate>
		<dc:creator>Zarar</dc:creator>
				<category><![CDATA[BGP]]></category>
		<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[iPhone]]></category>
		<category><![CDATA[iPod]]></category>
		<category><![CDATA[IPv6]]></category>
		<category><![CDATA[MPLS]]></category>
		<category><![CDATA[PE-CE Routing]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=715</guid>
		<description><![CDATA[6PE is a really cool feature which allows IPv6 islands to communicate with each other over an MPLS/IPv4 core network.  IPv4 addresses space is fast running out so familiarising yourself with IPv6 is probably a good idea. Consider the toplogy below. Service providers can leverage their MPLS networks to deliver IPv6 solutions without having to [...]]]></description>
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		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>OSPF down bit and domain tag</title>
		<link>http://www.debugall.co.uk/2009/02/07/ospf-down-bit-and-domain-tag/</link>
		<comments>http://www.debugall.co.uk/2009/02/07/ospf-down-bit-and-domain-tag/#comments</comments>
		<pubDate>Sat, 07 Feb 2009 08:10:28 +0000</pubDate>
		<dc:creator>Zarar</dc:creator>
				<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[iPhone]]></category>
		<category><![CDATA[iPod]]></category>
		<category><![CDATA[MPLS]]></category>
		<category><![CDATA[OSPF]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=696</guid>
		<description><![CDATA[Both the OSPF down bit and domain tag are modifications in OSPF which are used as loop prevention mechanisms.  Why are there two mechanisms you ask.  This is because type 5 LSAs do not contain the options field in the header.  The options field is where the down bit is set.  In LSA type 5 [...]]]></description>
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		<slash:comments>13</slash:comments>
		</item>
		<item>
		<title>Controlling MPLS Label Distribution &#8211; Video</title>
		<link>http://www.debugall.co.uk/2009/02/01/controlling-mpls-label-distribution-video/</link>
		<comments>http://www.debugall.co.uk/2009/02/01/controlling-mpls-label-distribution-video/#comments</comments>
		<pubDate>Sun, 01 Feb 2009 03:28:59 +0000</pubDate>
		<dc:creator>Zarar</dc:creator>
				<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[iPhone]]></category>
		<category><![CDATA[iPod]]></category>
		<category><![CDATA[MPLS]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=686</guid>
		<description><![CDATA[I was looking through my archives to remember how to configure &#8220;controlling label distribution&#8221; and realised that I had not not made a video for this subject, so here goes. Consider the topology below. As we all know, LDP assigns a Label for each IGP prefix and connected route in the RIB.  Therefore when we [...]]]></description>
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		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Reserved MPLS labels</title>
		<link>http://www.debugall.co.uk/2009/01/28/reserved-mpls-labels/</link>
		<comments>http://www.debugall.co.uk/2009/01/28/reserved-mpls-labels/#comments</comments>
		<pubDate>Wed, 28 Jan 2009 04:31:53 +0000</pubDate>
		<dc:creator>zismail</dc:creator>
				<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[MPLS]]></category>

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		<description><![CDATA[A table showing some of the more important reserved MPLS labels. I&#8217;ll add more on these labels in a later post. Label Value LDP TDP 0 IPv4 Explicit Null IPv4 Implicit Null 1 Router Alert IPv4 Implicit Null 2 IPv6 Explicit Null Router Alert 3 IPv4 Implicit Null IPv6 Explicit Null]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Virtual Private LAN service &#8211; VPLS</title>
		<link>http://www.debugall.co.uk/2009/01/14/virtual-private-lan-service-vpls/</link>
		<comments>http://www.debugall.co.uk/2009/01/14/virtual-private-lan-service-vpls/#comments</comments>
		<pubDate>Wed, 14 Jan 2009 05:02:29 +0000</pubDate>
		<dc:creator>Zarar</dc:creator>
				<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[MPLS]]></category>
		<category><![CDATA[VPLS]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=637</guid>
		<description><![CDATA[VPLS is a layer 2 VPN architecture which was designed for multipoint connectivity and broadcast capability. Enterprisees who wish to appear connected on the same LAN segment can use this service. Enterprise CE switches connect to PE routers who are enabled for VPLS.  When you configure VPLS on a PE you are effectivley creating a [...]]]></description>
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		<slash:comments>6</slash:comments>
		</item>
		<item>
		<title>ARF &#8211; Automatic Route Filtering</title>
		<link>http://www.debugall.co.uk/2008/12/28/arf-automatic-route-filtering/</link>
		<comments>http://www.debugall.co.uk/2008/12/28/arf-automatic-route-filtering/#comments</comments>
		<pubDate>Sun, 28 Dec 2008 03:42:43 +0000</pubDate>
		<dc:creator>zismail</dc:creator>
				<category><![CDATA[BGP]]></category>
		<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[MPLS VPN]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=525</guid>
		<description><![CDATA[When designing an MPLS network you will have to decide whether to configure a full mesh of MP-iBGP sessions between your PEs as in diagram 1 below or whether to use a hub and spoke topology as in diagram 2 below. Diagram 1 &#8211; BGP full mesh Diagram 2 &#8211; BGP partial mesh The most [...]]]></description>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Controlling Label distribution</title>
		<link>http://www.debugall.co.uk/2008/11/26/controlling-label-distribution/</link>
		<comments>http://www.debugall.co.uk/2008/11/26/controlling-label-distribution/#comments</comments>
		<pubDate>Wed, 26 Nov 2008 18:54:38 +0000</pubDate>
		<dc:creator>zismail</dc:creator>
				<category><![CDATA[CCIE SP]]></category>
		<category><![CDATA[MPLS]]></category>
		<category><![CDATA[LDP]]></category>

		<guid isPermaLink="false">http://www.debugall.co.uk/?p=314</guid>
		<description><![CDATA[Unlike label filtering, controlling label distribution actually stops label bindings being advertised. Consider the toplogy below. Without controlling label distribution, PE2 will generate a label for all IGP and connected prefixes.  PE2s LIB can be seen below. PE2#show mpls ldp bindings lib entry: 1.1.1.1/32, rev 19 local binding:  label: 17 remote binding: lsr: 2.2.2.2:0, label: [...]]]></description>
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		<slash:comments>0</slash:comments>
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