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 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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 SYSChapter 11: Open Shortest Path First (OSPF)Configuring Stubby AreasWe talked about three kinds of Stubby Areas: Stub Area, Not So Stubby Area(NSSA), and Totally Stubby Area. Let's look at our image again:INTERNETBGPGHArea 2EFArea 1ACArea 0BackboneBDIJArea 51RIPMOKArea 4LNConfiguring Stub AreasArea 2 is an example of Stub Area. To configure it as a Stub Area, all three ofthe routers in this area (Router B, Router G, and Router H) will need to definetheir area as Stub. This is done in the global OSPF configuration of each routerin the area:BR-Switch#conf tBR-Switch(config)#router ospfBR-Switch(config-ospf-router)#area 2 stub 10This defines Area 2 as Stub. What's the 10? When you define an area as Stub,OSPF no longer shares all of the cost information for the myriad of differentroutes outside of the Area. Remember, a Stub area is intended to simply use adefault gateway to get outside of the Area. The 10 is an assigned cost forentering or leaving the Area. I chose 10, but I could have easily chosen 5 or 1or 65,000, but when you define an area as Stub, you must define the cost forleaving or entering the area.Configuring Not So Stubby Areas (NSSA)Area 4 is an example of a Not So Stubby Area. We have Router K as an ASBR,and we need to feed the routes it receives to Area 0, but we don't want anyother routers from outside the AS. This needs to be defined on every router inthe area (Routers J, K, and L).254 Brocade IP Primer