BROCADE IP PRIMER

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T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMEJECT SYSBI4XGBI4XGBI24CBI24CBI24C61T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX127BigIron RX-8NETWORKS1813241930253631AC OK DC OK ALMEJECT SYS AC OK OK ALMBI4XGBI4XGBI24CBI24CBI24C61127BigIron RX-8NETWORKS181324193025AC OK DC OK ALMEJECT SYS AC OK OK ALM4237T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX4843BI24CBI24CBI24CBI24CBI24CBI4XGBI4XGT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALM363142374843BI24CBI24CBI24CBI24CBI24CBI4XGBI4XGT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMBI4XGBI4XGBI24CBI24CBI24CBigIron RX-8NETWORKSAC OK DC OK ALMEJECT SYS AC OK OK ALMBI4XGBI4XGBI24CBI24CBI24C6161T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX12718132419302536314237T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX127BigIron 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X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALM3631Console49F Link 50FPower1F 2F 3F 4FT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALM42371234567891011121314484315161718192021222324252627282930313233343536BI24CBI24CBI24CBI24CBI24CBI4XGBI4XG3738394041424344EJECT SYS45464748T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMEJECT SYSEJECT SYSBI4XGBI4XGBI24CBI24CBI24C61127BigIron RX-8NETWORKS18132419BI4XGBI4XGBI24CBI24CBI24C61T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX127BigIron RX-8NETWORKSAC OK DC OK ALMEJECT SYS AC OK OK ALM1813241930253631AC OK DC OK ALMEJECT SYS AC OK OK ALMT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX3025363142374843BI24CBI24CBI24CBI24CBI24CBI4XGBI4XG42374843BI24CBI24CBI24CBI24CBI24CBI4XGBI4XGT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMBI4XGBI4XGBI24CBI24CBI24C61127BigIron RX-8NETWORKS18132419EJECT SYST X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX30253631AC OK DC OK ALMEJECT SYS AC OK OK ALMBI4XGBI4XGBI24CBI24CBI24C61127BigIron RX-8NETWORKS181324193025AC OK DC OK ALMEJECT SYS AC OK OK ALMEJECT SYS4237T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX4843BI24CBI24CBI24CBI24CBI24CBI4XGBI4XGT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALM363142374843BI24CBI24CBI24CBI24CBI24CBI4XGBI4XGT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMEJECT SYSEJECT SYSBI4XGBI4XGBI24CBI24CBI24C61T X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RX127BigIron RX-8NETWORKSConsole49F Link 50FPower1F 2F 3F 4F1813241930253631AC OK DC OK ALMEJECT SYS AC OK OK ALM12345678910111213141516171819202122232425262728293031323334353637383940414243444546474842374843BI24CBI24CBI24CBI24CBI24CBI4XGBI4XGT X RX T X RX T X RX T X RXT X RX T X RX T X RX T X RXDC EJECT SYS AC OK DC OK ALMEJECT SYS AC OK DC OK ALMEJECT SYSAreasArea 0 - The BackboneAs I mentioned earlier, there must be at least one area, and that area is Area0. Every OSPF implementation must have an Area 0. This is the backbone. Allinter-area communication travels through the backbone. Every area must beconnected to Area 0.It is not uncommon for an OSPF configuration to only have Area 0. This certainlywould be suitable for smaller networks. For larger networks (or forsmaller networks that need room to grow), Area 0 should be central, redundant,and high-bandwidth. After all, all of your other areas are going tocommunicate to each other through it.Area Border RouterThis is a router that has one interface in one OSPF area, and another interfacein a different OSPF area. A single router can be a member of several differentareas (one area per interface). An ABR may be the DR or BDR for its area, butit certainly doesn't have to be. The ABR's job is simply to share its area's routeswith other areas that it's connected to. An ABR will typically always have oneinterface in Area 0 (there's one exception that we'll talk about later).EFINTERNETBGPArea 1ACGArea 0BackboneBDHArea 2IJArea 51RIPMOKArea 4LNRouters A, B, C, and D all have interfaces in Area 0. Routers B, C, and D haveinterfaces in other areas. They are Area Border Routers. Router A is what wewould call an Internal Router (IR). It's participating only in its own area. Somemight still refer to Router A as a Backbone Router, as it is in Area 0. Router J isalso an ABR, but we'll talk more about that a little later. That one's a specialcase.Brocade IP Primer 245