e-1 VLAN 130 IP 10.1.32.3 255.255.254.0 VLAN 130 Core-2 VLAN 130 IP 10.1.32.4 255.255.254.0 VLAN 130 Reserved 10.1.32.5 255.255.254.0 VLAN 130 Reserved 10.1.32.6 255.255.254.0 VLAN 130 Reserved 10.1.32.7 255.255.254.0 VLAN 130 Reserved 10.1.32.8 255.255.254.0 VLAN 130 Color Printer in Charlie's office 10.1.32.9 255.255.254.0 VLAN 130 Color Printer in Lucy's office 10.1.32.10 255.255.254.0 VLAN 130 Color Copier #1 10.1.32.11 255.255.254.0 VLAN 130 Color Copier #2 Figure 33-5. IP address layout sheet Once you have all this information documented, building the configurations should be a snap. As an added bonus, the spreadsheets are excellent documents for the net- work. They can be printed and put in binders, or simply stored somewhere for easy access. Once the network is built, I suggest printing out a copy of all the documentation you've made. This way, when something changes, you have documented evidence of the condition of the network at the time of its implementation. Documentation Bay Face Layouts If you're unfamiliar with the term, bay face layouts are diagrams showing how each rack will be built, including every detail. For me, the biggest benefit of bay face lay- outs is that once I've created them, I can have someone else install the equipment, if need be: I can turn over all the boxes, and a copy of the bay face layouts and say, "Make it look like this." A bay face layout example is shown in Figure 33-6. Rack #1 Rack #2 Rack #3 Rack #4 Internet HQ-Colo Core-1 Core-2 Figure 33-6. Bay face layout There are three things that many engineers forget when designing or planning rack space: power, cabling, and patch panels. All of these items take up space in your racks. Getting your rack space requirements wrong can be a costly mistake, especially if you're renting collocation space. Bay face layouts are an excellent sanity check to ensure that you have enough racks to support all the equipment you've bought. Chapter 33: Designing Networks Power and Cooling Requirements This is a good time to work out your power 