Drawing Tools Available to Create Your Data Center Layout
Part of creating a productive Data Center is a logical layout of all its constituent parts. From air handlers to electrical panels, sprinkler pipes to server rows, floor tiles to telephones, you must specify not only what components go in your server environment but also where exactly the components are to be located. One of the most effective ways to communicate the layout is the creation of a detailed map of the Data Center. While it is possible to create an informative de..
With the introduction of the Versatile Interface Processor (VIP) cards, Cisco made the ultimate step toward a peer multiprocessor architecture. Each VIP card contains its own MIPS r4600 RISC processor, runs a mini-IOS kernel, and has configurable levels of SRAM and DRAM. Although the VIP1 was available for a short time, most of the installed base consists of VIP2s. The distributed features are targeted at the 7500 series (see Figure 5-6), but a VIP1 without distributed featur..
Network Address Translation and Port Address Translation
NAT is a router function, which allows it to translate the addresses of hosts behind a firewall. This also helps to overcome IP address shortage, and provides security by hiding the entire network and its real IP addresses. NAT is typically used for internal IP networks that have unregistered (not globally unique) IP addresses. NAT translates these unregistered addresses into legal addresses on the outside (public) network. PAT provides additional address expansion but is l..
Limiting the Impact of IP Helper Addresses
The ip helper-address command implicitly enables forwarding several different kinds of UDP broadcasts. You can prevent the router from forwarding the unwanted types of broadcasts with the no ip forward-protocol udp configuration command: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#no ip forward-protocol udp tftp Router1(config)#no ip forward-protocol udp nameserver Router1(config)#no ip forward-protocol u..
Gigabit Ethernet Port Cables and Connectors
Gigabit Ethernet connections take a different approach by providing modular connectivity options. Catalyst switches with Gigabit Ethernet ports have standardized rectangular openings that can accept gigabit interface converter (GBIC) or small form factor pluggable (SFP) modules. The GBIC and SFP modules provide the media personality for the port so that various cable media can connect. In this way, the switch chassis is completely modular and requires no major change to..
