BROCADE IP PRIMER

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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 SYSConfiguring OSPFAgain, this is defined in the global OSPF config:BR-Switch#conf tBR-Switch(config)#router ospfBR-Switch(config-ospf-router)#area 4 nssa 5The number at the end (“5”) defines the cost for entering or leaving the area.My choice of 5 was completely arbitrary.Configuring Totally Stubby AreasDefining a Totally Stubby Area is very similar to defining a Stub Area. We justneed to add one important keyword at the end:BR-Switch#conf tBR-Switch(config)#router ospfBR-Switch(config-ospf-router)#area 6 stub 100 no-summaryWhen you define a Stub Area, you know that no Type 5 LSAs (External) will beadvertised to the area. When you define a Totally Stubby Area, no Type 5, Type4, or Type 3 LSAs (with the exception of a default gateway) will be advertised tothe area. This is what that “no-summary” keyword will do.Configuring a Virtual LinkRemember how we said that every area must be connected to Area 0? What ifthat's physically impossible? Let's look at our areas again:INTERNETBGPGHArea 2EFArea 1ACArea 0BackboneBDIJArea 51RIPMOKArea 4LNArea 4 does not physically connect to Area 0. It can't. Router J only has onelink, and that's to Router I. Router I is not the ABR for Area 0. Router D is. All isnot lost. There is a reason that dashed line is there. To conform to the rule, weestablish a Virtual Link.Brocade IP Primer 255