BROCADE IP PRIMER

ServerIronServerIronBI4XGBI4XGBI24CBI24CBI24C1BigIron RX-8NETWORKS7AC OK DC OK ALMEJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMConsoleNETWORKSFastIron Edge X44849F Link 50F1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47Power1F 2F 3F 4F2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 486T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX12131819242530313637424348BI24CBI24CBI24CBI24CBI24CBI4XGBI4XGT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXEJECT SYSHot-Standby RedundancyOkay, so you've bound HTTP to rs1's port 12345. Won't that mean that the virtualserver will listen on TCP 80 (HTTP) and the real server will listen on TCP orUDP 12345? Wait a minute. We've added another line. What does that say?“no port http translate”? It means that we've specifically instructed the virtualserver not to translate the port. This means that the virtual server will stillspeak to the real server using HTTP. The “port 12345" only means somethingwithin the confines of the ServerIron config.A real server's port may only be bound once. How can we get around this? Bycreating a fake port (or shadow port). When we bind the port, though, we needto make sure that the virtual server does not translate the port. Otherwise, theServerIron will attempt to communicate to the real server on the fake portyou've created.You can create as many shadow ports as you need. In this example, we've justcreated one. We only needed to bind rs1's http port to one other virtual server.With additional shadow ports, though, we could bind rs1's http port to manydifferent virtual servers. This will become important when we start to look atServerIron redundancy.Hot-Standby RedundancyWe always want to make sure that we eliminate as many single points of failureas we can. Since ServerIrons are an important part of the infrastructure,we need to be protected in the case of a failure.One way we can do this is with Hot-Standby Redundancy. In this case, wewould attach the servers to a central layer-2 switch (as opposed to aServerIron directly). We would then provide two ServerIrons. We would connecteach ServerIron to the same layer-2 switch, and then, to each other.INTERNETe1e1Brocade IP Primer 345