Read e-book online A Primer of Multicast Routing PDF

By Eric Rosenberg

ISBN-10: 1461418720

ISBN-13: 9781461418726

Whereas unicast routing determines a course from one resource node to 1 vacation spot node, multicast routing determines a direction from one resource to many locations, or from many assets to many locations. We survey multicast routing equipment for while the set of locations is static, and for whilst it truly is dynamic. whereas lots of the tools we evaluate are tree established, a few non-tree tools also are mentioned. We survey effects at the form of multicast timber, hold up restricted multicast routing, aggregation of multicast site visitors, inter-domain multicast, and multicast digital deepest networks. We specialise in simple algorithmic rules, and mathematical versions, instead of implementation point protocol information. Many traditionally very important equipment, whether now not at present used, are reviewed to provide standpoint at the evolution of multicast routing.

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Example text

Suppose the receiver host behind node 6 also decides to leave g. Then node 6 informs node 3 that traffic for g should not be sent to node 6, so arc (3, 6) is deleted from the ( , g) OIL at node 3. Now node 3 is a leaf node of the tree. Since there are no receiver hosts behind node 3 itself, then 3 informs its upstream neighbor, node 2, that traffic for g should not be sent to node 3, so node 2 deletes arc (2, 3) from the ( , g) OIL at node 2. This process continues until no further pruning can be done.

Each node on the (s3 , g2 ) tree maintains (s3 , g2 ) state, and stores the interface to the RPF neighbor and the (s3 , g2 ) OIL. When the number of sources and groups is large, considerable memory can be required at each node to store, for each (s, g) tree touching the node, the (s, g) pair, the interface to the RPF neighbor, and the outgoing interface list. The memory requirement can be greatly reduced by using shared trees. 3 Shared Trees A shared tree for a group g is a single tree used by all sources for g.

For a given node n, let I(n) be the set of incoming arcs at n and let J (n) be the set of outgoing arcs at n. We reserve the first k arc indices for the arcs incoming to s, so I(s) = {1, 2, · · ·, k}. , more than one incoming interface), then we select |I(n)| · |J (n)| coefficients fij such that i ∈ I(n), j ∈ J (n), and fij ∈ GF (q). For example, if q = 2 the field is GF (2), and if n has 3 incoming interfaces and 2 outgoing interfaces, then we generate 6 binary coefficients for this n. If n has exactly one incoming arc i, each arriving packet is duplicated and sent out over each outgoing arc; in this case we set fij = 1 for j ∈ J (n).

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A Primer of Multicast Routing by Eric Rosenberg


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