NEXT_HOP Behavior on Multiaccess Media
A medium is considered multiaccess (MA) if routers connected to that medium can exchange data in a many-to-many relationship. Routers on an MA medium share the same IP subnet and can physically access all other routers on the medium in one hop (directly connected). Ethernet, FDDI, Token Ring, Frame Relay, and ATM are examples of multiaccess media. The rule that IP has on MA media is that a router should always advertise the actual originator of the route in case the route's s..
The following list describes the process that occurs when a radio card uses passive scanning: 1. The radio card automatically tunes to each RF channel, listens for a period of time, and records information it finds regarding access points on each channel. 2. 2. By default, each access point transmits a beacon frame every 100 milliseconds on a specific RF channel, which the administrator configures. 3. While tuned to a specific channel, t..
Instead of forming an infrastructure wireless LAN, the 802.11 standard allows users to optionally connect directly to each other in what is referred to as ad hoc mode, illustrated in Figure 22-3. The rationale behind this form of networking is to enable users to spontaneously set up wireless LANs. This optional mode is available to users on most radio cards. With ad hoc mode, there is no need for access points. The wireless connection is made directly between the users in a..
Figure 18-3 extends the discussion in the previous section to present a conceptual diagram of the Catalyst 6000 Native IOS Mode. Figure 18-3. Conceptual Diagram of the MSFC Native IOS Mode In Figure 18-3, the Gigabit Ethernet ports on the Supervisor (1/1 and 1/2) have been configured as fully routed interfaces. Slot 5 contains a Fast Ethernet line card. Ports 5/1–5/3 have been configured as Layer 2 switchports in VLAN 2. Ports 5/4–5/6 have been configured as..
Dynamically Allocating Client IP Addresses via DHCP
The following set of configuration commands allows the router to dynamically allocate IP addresses to client workstations: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#service dhcp Router1(config)#ip dhcp pool 172.25.1.0/24 Router1(dhcp-config)#network 172.25.1.0 255.255.255.0 Router1(dhcp-config)#default-router 172.25.1.1 Router1(dhcp-config)#exit Router1(config)#ip dhcp excluded-address 172.25.1.1 172..
