Next-Generation Internet Initiative
The federally funded Next-Generation Internet (NGI) Initiative[] is a multiagency U.S. federal research and development program that is developing advanced network technologies and revolutionary applications and demonstrating these capabilities on testbeds that are 100 to 1,000 times faster end-to-end than today's Internet. The NGI initiative began October 1, 1997, with the following participating agencies: • DARPA (Defense Advanced Research Projects Agency) • DoE (Depa..
Examining the RP’s Multicast Routing Table
In the current state of the ongoing example, as last shown in Figure 20-16, the RP (R3) has joined the SPT for source 10.1.1.10, group 228.8.8.8. The RP also is the root of the shared tree for group 228.8.8.8. Example 20-9 shows both entries in R3’s multicast route table. Example 20-9 Multicast Route Table Entry for the Group 228.8.8.8 for R3 The first entry shows the shared tree, as indicated by the S flag. Notice the incoming interface is Null because R3, as RP, i..
The link-state request packet, OSPF packet type 3, is sent in response to a router during the database exchange process. This request is sent when a router detects that it is missing parts of the database or when the router has a copy of LSA older than the one it received during the database exchange process. Figure 9-5 shows fields in the link-state request packet. The request packet contains each LSA specified by its LS type, link-state ID, and advertising router. This uniq..
LDP GR Mechanism for Downstream On-Demand Mode
LDP GR Mechanism for Downstream On-Demand Mode The previous section described LDP GR mechanism for the downstream unsolicited label distribution mode.[7] This section describes the LDP GR mechanism for downstream on-demand label distribution by drawing on the concepts of the previous section. To avoid repetition of information already described in the previous section, the following discussion first summarizes LDP GR procedures that are common to both modes. It then describe..
Multicast over Frame Relay or ATM WANs
When using PIM-SM on an nonbroadcast multiple access (NBMA) network, such as a Frame Relay or ATM WAN, you must configure the ip pim nbma-mode interface command: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ip multicast-routing Router1(config)#interface Serial0/0 Router1(config-if)#encapsulation frame-relay Router1(config-if)#ip pim sparse-mode Router1(config-if)#ip pim nbma-mode Router1(config-if)#end ..
