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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-55
ASBR can exist in NSSA area, and certain number of AS external routes can be
imported to OSPF routing domain.
1、 To configure this area into NSSA area, you must configure "area nssa"
command on all devices (Switch B/D) connected to NSSA area.
Configuration Steps
The following information only shows the steps to configure NSSA area. For
OSPF basic configurations, please refer to the examples shown above.
Step 1: Configure static route redistribution
Configurations on Switch C
! Configure static route
SwitchC(config)#ip route 191.10.10.0 255.255.255.0 192.168.5.2
! OSPF static route redistribution
SwitchC(config)#router ospf 1
SwitchC(config-router)#redistribute static subnets
Configurations on Switch D
! Configure static route
SwitchD(config)#ip route 172.10.10.0 255.255.255.0 192.168.6.2
! OSPF static route redistribution
SwitchC(config)#router ospf 1
SwitchC(config-router)#redistribute static subnets
Step 2: Configure NSSA
Configurations on Switch B (ABR)
SwitchB(config)#router ospf 1
! Define NSSA area and prohibit ABR device from sending summary LSAs
(Type-3 LSA) to NSSA area.
SwitchB(config-router)#area 2 nssa no-summary
Configurations on Switch D (ASBR)
SwitchD(config)#router ospf 1
SwitchD(config-router)#area 2 nssa
Verify configurations
Step 1: Display the routing information when Area 2 is a normal area.
Display the routing table of Switch D (ASBR)