Infrastructure Mode Configuration
An infrastructure wireless LAN (sometimes referred to as infrastructure mode) is what most companies, public hotspots, and home users implement. An infrastructure wireless LAN, as depicted in Figure 22-1, offers a means to extend a wired network. In this configuration, one or more access points interface wireless mobile devices to the distribution system. Each access point forms a radio cell, also called a basic service set (BSS), which enables wireless users located within t..
Business Priorities Must Come First
A university I once worked with decided it was time to allow the student body and faculty wireless access to the campus network. The convenience of access, cost reduction in wiring buildings, and potential productivity increase were the overarching business drivers for the decision. At first blush, however, the security department was reluctant to proceed. For years, the university did not require students to have accounts to access the network. Rather, authentication was re..
Provider-Edge QoS Considerations
PE designs are relevant for service providers (and for enterprises that are self-managing their own MPLS VPNs). Two unique considerations for PE QoS design are discussed next: • Service provider-to-enterprise models • MPLS DiffServ tunneling modes These considerations are examined in more detail in the following sections. Service Provider-to-Enterprise Models The PE edges facing customer CEs are complementary to the enterprise-to-se..
You can look at the attributes for a tunnel with the show interface command. Router1#show interface Tunnel5 And the easiest way to determine if a tunnel is operational is simply to use a PING test to either the send ICMP packets through the tunnel or to its destination address: Router1#ping 192.168.66.6 Router1#ping 172.22.1.4 You can use the standard show interface command on a tunnel interface to see a considerable amount of useful information about it: Router1#show in..
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 ..
