Network multicast address planning of lingke Router

To build a network, it is essential to plan multicast addresses. Next, I will explain how to plan the network multicast address in terms of multicast routing and set point RP.
1. Select a multicast route. In this case, the Multicast Route selects protocol-Independent Multicast, And the PIM does not depend on a specific routing protocol, it can use the unicast route table established by various unicast routing protocols to check the reverse route forwarding RPF, rather than maintaining a separate Multicast Route table for multicast forwarding. PIM does not need to send and receive multicast route updates. Therefore, compared with other multicast protocols, PIM overhead is much lower, PIM is designed to support both the Shortest Path Tree SPT and the shared tree over the Internet, and enable flexible conversion between the two. Therefore, the advantages of these algorithms improve the multicast efficiency. Www.2cto.com PIM defines two modes: Sparse Mode and intensive mode:
1. The Sparse Mode PIM-SM uses the shared tree for multicast packet forwarding, each group has a set point, the Multicast Source along the Shortest Path radial set point to send data, then by the set point, data is sent to each receiver along the shortest path. One of the main advantages of PIM-SM is that it is not limited to receiving multicast information through the sharing tree, but also provides a mechanism to switch from the sharing tree to the SPT. The fundamental difference between the PIM-SM and the diffusion-based model is that the PIM-SM is based on the explicit addition model, that is, the receiver sends the message to, the vro forwards the multicast packet only on the multicast group output interface.
2. Dense mode this mode is suitable for the following situations: small-scale high-speed networks; multicast sources and receivers are relatively close, fewer senders, more receivers; multicast data streams are relatively large and relatively stable. PIM-DM intensive mode protocol, using a diffusion mechanism, at the same time, assuming that the bandwidth is not limited, Each router wants to receive multicast packet, the PIM-DM uses reverse path forwarding RPF dynamic establishment of the shortest path tree SPT.
2. Select the collection point RP1. Because the video source size is mostly on the core layer, the collection point is on the Core routing device and comprehensively considers the network reliability and availability, the core device selected is the set point. Server Load balancer and redundancy can be achieved through CiscoAnycastRP technology. Multicast Source Discovery Protocol (MSDP) is a key Protocol for achieving the Anycast set point. MSDP allows the set point to share the activity Source information. 2. In the AnycastRP environment, configure the same IP address on the Loopback interface for two or more set points. The AnycastRPloopback address should be a 32-bit host address, and the IP route will automatically select the best set point. Anycast RP provides IPMulticast fast switching (within several seconds) and load balancing. Www.2cto.com 3. 10.6.2.1 is configured for ciscow.st4006 on all aggregation layer switches. The configuration is as follows: router (config) # ippimrp-address10.6.2.1 5. multicast design (IGMP-SnoopingandCGMP) in the L2 environment ).
Iii. Planning of multicast addresses assume a networking environment. The IPMulticast address is a Class D address and the address range is 224.0.0.0-239.255.255.255, class D addresses are divided into local connection multicast addresses, reserved multicast addresses, and management permission multicast addresses. 1. Local link address: 224.0.0.0 ~ 224.0.0.255 is used for LAN. The Router does not forward IP packets in this range. The local link address is allocated as follows: 224.0.0.1-all systems in the local subnet; 224.0.0.2-all routers in the local subnet; 224.0.0.5-OSPF: vro; 224.0.0.6-OSPF: vro; 224.0.0.9-r00002; 224.0.0.10-IGRP; 224.0.0.13-PIMv2; 224.0.0.22-IGMPv3.
2. Reserved multicast address: 224.0.1.0 ~ 238.00000000255 is used for global or network protocols. The network address range (224.0.1.0-224.0.1.255) is allocated as follows: www.2cto.com 224.0.1.39-Cisco-RP-Announce (Auto-RP ); 224.0.1.40-Cisco-RP-Discovery (Auto-RP ). 3. Management permission address: 239.0.0.0 ~ 239.00000000255, used within the organization to restrict the multicast range.
4. Management permission addresses are used for multicast addresses in this project. Within the scope of Management permission addresses, Organization-local and Site-local are defined) the multicast address. Address range of the organization: 239.8.0.0-239.8.126.255-global application; address range: 239.8.128.0-239.8.20.255-local application. These are the key points of network multicast address division. For more information about network multicast address division, see.