Determining the Contents of Updates
A router builds the contents of its Update messages based on the contents of its BGP table. However, the router must choose which subset of its BGP table entries to advertise to each neighbor, with the set likely varying from neighbor to neighbor. Table 12-8 summarizes the rules about which routes BGP does not include in routing updates to each neighbor; each rule is described more fully following the table. Table 12-8 Summary of Rules Regarding Which Routes BGP Does Not Inc..
In general, the U.S. FCC does not require users to license wireless LAN products, assuming that the user does not exceed certain emission limits. The FCC uses Effective Isotropic Radiated Power (EIRP) as a factor for determining whether a wireless LAN is in compliance with regulatory rules. EIRP equals the transmit power (in dBm) minus cable and connector losses (in dB) and plus the antenna gain (in dB). For 802.11b/g access points and radio cards, the EIRP can be up to 36 dB..
As discussed in Chapter 4, "Network Topology and Design," accounting of data traffic is not only important for customer billing, but is a crucial part of traffic engineering. For example, knowing the relative size of flows between routers in the network core can help you calculate the most cost-effective topology and circuit size of the core network. In terms of operation, Netflow switching is similar to the fast-switching cache: The first packet of any fl..
Using an Internal ISDN PRI Module
You can configure an ISDN PRI controller module by using the controller T1 command set as follows: Router8#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router8(config)#isdn switch-type primary-dms100 Router8(config)#controller T1 0 Router8(config-controlle)#framing esf Router8(config-controlle)#clock source line primary Router8(config-controlle)#linecode b8zs Router8(config-controlle)#pri-group timeslots 1-24 Router8(config-controlle)..
Cisco routers include a simple but useful debug facility for NAT. The basic form of the command is debug ip nat: Router#debug ip nat You can also add the detailed keyword to this command to get more information on each NAT event: Router#debug ip nat detailed It is often useful to use an access-list with the debug command. You can do this by simply specifying the number of the access-list. This will allow you to just look at NAT events for particular IP addresses that are ..
