Figure 7-23: Illustration of how the sample network could be connected and addressed in Software

Drawer EAN 13 in Software Figure 7-23: Illustration of how the sample network could be connected and addressed

Figure 7-23: Illustration of how the sample network could be connected and addressed
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With just one network number and multiple subnets, the routing tables (and hence the size of routing updates) grow as the number of branches grows This can be a problem for branches connected on dial backup, as large routing updates can consume significant bandwidth If the internetwork grows to the point that it's servicing more than 1000 branches, you might be forced to implement a distributed dial backup scheme An option we will consider is using access lists applied as distribution lists to restrict the size of routing advertisements sent on low bandwidth links With a central dial backup pool of ports, we will implement one network number for the entire internetwork and choose an appropriate netmask for all interfaces I could choose a netmask of 255255255224 This gives 30 usable addresses for each location and 2046 subnets If a location has more workstations than that, a secondary address can be used to give another 30 usable addresses from a different subnet If, in our sample internetwork, most of the sites have more than 30 workstations, we can assign a netmask of 255255255192 for all interfaces, which gives us 62 usable addresses for each subnet, with 1022 subnets Let's use 255255255192, as this company cannot imagine having more than 1000 locations, and having more usable addresses in the subnet makes it easier if a few branches are larger than 30 workstations
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This is where all the hosts and access points for the Internet, as well as the pool of ISDN ports used for dial backup connections, are located When putting together an internetwork of this type, I would go to great pains to ensure that access to the hosts is via the TCP/IP protocols Most hosts support TCP/IP directly and allow remote client computers to connect via Telnet, and even IBM hosts have capabilities for this through TN3270 and TN5250 An emerging technology software loaded on the host that allows hosts to be accessed via HTTP and display host information in a WWW format also is a possibility As long as we restrict our WAN to using TCP/IP, however, we are in good shape whichever way we go
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The next big decision is how to connect the central site LAN to the WAN We have said that HSRP will not be used in this instance, and why not Well, HSRP is a really good idea if both of the routers that are sharing the responsibility of servicing traffic sent to the phantom have equally good
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routers that are sharing the responsibility of servicing traffic sent to the phantom have equally good routes to all destinations This is not the case in our internetwork, so let's look at what would happen if we were to implement HSRP here An HSRP configuration has two routers, one of which will be elected to service traffic sent to the phantom In our internetwork, we may choose to connect San Francisco and Los Angeles to one router, and New York and Atlanta to the other This configuration would enable traffic to get to all distribution centers even if one of the HSRP routers failed Let's look at what happens during normal operation Say the router connected to San Francisco and Los Angeles is elected as the primary and will then service all requests sent to the phantom Traffic bound for New York and Atlanta, therefore, will be sent to Los Angeles first and the direct links to New York and Atlanta will not be used The only time they would be used is if the router connected to San Francisco and Los Angeles failed Clearly this is far from an optimal situation In this case I recommend a low-tech solution: Have an identically configured standby WAN 4700 router in the same cabinet as the live one, and manually swap over connections if it fails If you need the resilience that HSRP offers, then you need to put together a more complex set of WAN interconnections, something like that shown in Fig 7-24 This configuration has each router in the HSRP pair with the same WAN connections; it does not matter so much which router gets elected as the master and routes all the traffic bound for the HSRP phantom As you can see, HSRP gets expensive on WAN bandwidth and the lines connected to the inactive HSRP router do not carry any traffic Given that Cisco hardware really is reliable, in this situation I would stick with the manual swap-over option
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