Definitive MPLS network designs by Jim Guichard

By Jim Guichard

The e-book starts off with a know-how refresher for every of the applied sciences coated within the layout experiences, together with VPNs, TE, QoS, multicast, Pseudowires, community restoration, and IPv6. Following this evaluate are targeted layout experiences, each one in keeping with a collection of features and pursuits universal to a profile of networks deploying MPLS. The booklet incorporates a layout research for an Inter-eXchange provider (IXC), a countrywide telco, a world merchant, and an firm. The authors advance each one layout examine in a constant demeanour, beginning with an outline of the community atmosphere and supported companies. They then establish the goals that stimulated the layout. each one research then information all features of the community layout utilizing the most recent MPLS applied sciences. ultimately, a couple of classes to be drawn from the layout examine are mentioned, permitting readers to use the recommendations that meet their wishes.

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Address resolution IPv6 nodes determine the link-layer address of destinations on the link (equivalent to ARP for IPv4). • Handling of unreachability issues IPv6 nodes detect neighbor unreachability as well as duplicate addresses. IPv6 hosts can be instructed to redirect their traffic to a better firsthop router. Address autoconfiguration is supported in IPv6 through both a stateless mechanism and a stateful mechanism. With IPv6 stateless address autoconfiguration (see [AUTO-CONF]), an IPv6 host can automatically generate its unique interface addresses by combining an interface identifier that uniquely identifies the interface on the link (for example, using an IEEE MAC address) and the prefix advertised by the routers for that link.

P routers are thus unaware of any multicast VPN activity and treat the P packets as native multicast packets. After the P packet is sent to the P network at the ingress PE router, the following events take place: 1. The P packet arrives at the egress PE router interface in the global multicast domain. 2. The P packet {S, G} or {*, G} entry is determined within the global multicast routing table. 3. The P packet is replicated out of any P network interfaces that appear in the olist of the {S, G} or (*, G} entry.

Therefore, a set of VPN customer multicast groups can be mapped into a single {S, G} or {*, G} entry in the service provider P network. The P network is responsible for building a default multicast distribution tree (called the default MDT) between PE routers for each multicast domain it supports. The unique multicast group in the P network is called an MDT group. Every mVRF belongs to a default MDT. Figure 1-20 illustrates the multicast group concept and shows two separate VPNs, each with its own multicast group within the service provider P network.

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