NSSA and STUB in OSPF settings of Huawei Routers

1. NSSA1. Connect to the Huawei router and perform the following configuration: (1) Enter system view www.2cto.com. (2) Start the ospf process [process-id] and enter the OSPF view. (3) area-id: Enter the OSPF area view. (4) Run nssa [default-route-advertise | no-import-route | no-summary] (5) run the default-cost command to configure the overhead of the default route sent to The NSSA region.
2. The vro in the Nassa NSSA region must use the nssa command to configure the region as the NSSA attribute. 3. The Default-route-advertise (optional) parameter command is only configured on the ABR. The Default route can be issued without the need to configure the ABR in the stub region, however, this command must be configured in The nssa region to deliver the default route. 4. no-summary: The optional parameter no-summary can only be configured on the ABR to work in this region. The ABR only publishes a Summary-LSA of the default route to the region, do not generate Inter-Area-Prefix-LSA, Inter-Area-Router-LSA, which neither has AS-external-LSAs nor the Stub region of summary-LSAs, it is also called the Totally NSSA region. 5. Default-cost: the Default route 0.0.0.0 0.0.0.0 In The nssa region is issued by the API. Therefore, this command must be configured on the API, and vrouters in other regions are unnecessary.
Ii. STUB www.2cto.com 1. The configuration steps are as follows: (1) Enter system view. (2) Start the ospf process [process-id] and enter the OSPF view. (3) area-id: Enter the OSPF area view. (4) stub [no-summary] configures the current region as the Stub region. (5) overhead of the default-cost configuration to be sent to the default route in the Stub region.
2. The Stub life attribute must be configured for all vrouters In the stub area. 3. The no-summary parameter can only be set on the ABR to work in this region. The ABR only publishes a summary-LSA of the default route to the region, do not generate Inter-Area-Prefix-LSA, Inter-Area-Router-LSA, which neither has AS-external-LSAs nor the Stub region of summary-LSAs, it is also called the Totally Stub area. 4. Default-cost, the Default route 0.0.0.0 0.0.0.0 In the stub region is issued by the ABR. Therefore, this command must be configured on the ABR, and vrouters in other regions are unnecessary.