WB1 6.24 ~ 6.33 OSPF Stub Area etc.

6.24 OSPF Stub Areas
6.25 OSPF Totally Stubby Areas
6.26 OSPF Not-So-Stubby Areas
6.27 OSPF Not-So-Stubby Areas and Default Routing
6.28 OSPF Not-So-Totally-Stubby Areas

終於重新學習也重新分析了一遍.

6.29 OSPF Stub Areas with Multiple Exit Points

6.30 OSPF NSSA Type-7 to Type-5 Translator Election

6.31 OSPF NSSA Redistribution Filtering

在NSSA區域的ABR上，可以不將自己的N1,N2 route釋放進area
 router ospf 1
   redistribute connected subnets
   area 3 nssa no-redistribution no-summary

6.32 OSPF LSA Type-3 Filtering

R2:
ip prefix-list R5_LOOPBACK deny 150.1.5.5/32
ip prefix-list R5_LOOPBACK permit 0.0.0.0/0 le 32
!
router ospf 1
  area 51 filter-list prefix R5_LOOPBACK in

R5:
ip prefix-list AREA_3_ROUTES deny 150.1.10.10/32
ip prefix-list AREA_3_ROUTES deny 155.1.108.0/24
ip prefix-list AREA_3_ROUTES permit 0.0.0.0/0 le 32
!
router ospf 1
  area 3 filter-list prefix AREA_3_ROUTES out

6.33 OSPF Forwarding Address Suppression

在NSSA區域的ABR上，ABR not preserve the value in the forward address field as a Type-7 NSSA External LSA is translated into a Type-5 External LSA.

R5:
router ospf 1
  area 3 nssa no-redistribution no-summary translate type7 suppress-fa

Rack1R3#show ip ospf database external 10.10.10.10

OSPF Router with ID (150.1.30.30) (Process ID 1)
Type-5 AS External Link States

Routing Bit Set on this LSA
LS age: 36
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 10.10.10.10 (External Network Number )
Advertising Router: 150.1.5.5
LS Seq Number: 80000004
Checksum: 0x7F54
Length: 36
Network Mask: /32
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0