Directory and Database Services
The implementation of this service should utilize distributed database and other advanced technologies. The NIS manager could coordinate this role with respect to other organizations that have created and maintained relevant directories and databases. AT&T was providing the following services under the NSF agreement: • Directory services (white pages): This provides access to Internet White Pages information using X.500, WHOIS, and netfind systems. The X.500 directory..
Completion of the Source Registration Process
So far in this description of PIM-SM, a source (10.1.1.10) sent packets to 228.8.8.8, as shown in Figure 20-13—but no one cared at the time, so the RP did not forward the packets. Next, you learned what happens when a host does want to receive packets, with the routers reacting to create the RPT for that group. This section completes the story by showing how an RP reacts to a PIM Register message when the RP knows that some hosts want to receive those multicasts. When the R..
As if the Spanning-Tree Protocol isn't exciting enough all by itself, it turns out that everything already discussed in the chapter actually occurs once per VLAN! In other words, Cisco uses one instance of STP per VLAN. This feature is generally referred to as PVST: per VLAN Spanning Tree. In other words, every VLAN can have a different Root Bridge and active topology. For example, VLAN 2 could look like part A of Figure 6-23, whereas VLAN 3 could look like part B. Figure 6..
Legacy Layer 3 Queuing Mechanisms
There is a long history of queuing algorithms in Cisco IOS Software, not all of which are covered in this chapter because they are not applicable to QoS deployment for converged networks. Newer queuing and scheduling algorithms are simply combinations and enhancements of older queuing algorithms. For a historical perspective and an understanding of why these mechanisms are insufficient for today's converged networks, it is helpful to review some of these legacy queuing techni..
Using NTP to Send Periodic Multicast Time Updates
Use the ntp multicast interface command to enable server-side NTP multicast packets: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#clock timezone EST -5 Router1(config)#clock summer-time EDT recurring Router1(config)#ntp server 172.25.1.1 Router1(config)#ntp server 172.25.1.3 Router1(config)#interface FastEthernet 0/0 Router1(config-if)#ntp multicast 224.0.1.1 ttl 1 Router1(config-if)#end Router1# To enable NT..
