HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 313
Configuring OSPFv3 area parameters, Configuration prerequisites, Configuring a stub area
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Configuring OSPFv3 area parameters OSPFv3 has the same stub area and virtual link features as OSPFv2. After you split an OSPFv3 AS into multiple areas, the LSA number is reduced and OSPFv3 applications are extended. To further reduce the size of routing tables and the number of LSAs, configure the non-backbone areas at an AS edge as stub areas. Non-backbone areas exchange routing information through the backbone area, so the backbone and non-backbone areas (including the backbone itself) must be fully meshed. If no connectivity can be achieved, configure virtual links. Configuration prerequisites Before you configure OSPFv3 area parameters, enable OSPFv3. Configuring a stub area All the routers attached to a stub area must be configured with the stub command. The keyword no-summary is only available on the ABR of the stub area. If you use the stub command with the keyword no-summary on an ABR, the ABR advertises a default route in an Inter-Area-Prefix-LSA into the stub area. No AS-external-LSA, Inter-Area-Prefix-LSA, or other Inter-Area-Router-LSA is advertised in the area. The stub area of this kind is also known as a "totally stub area." To configure an OSPFv3 stub area: Step 1. Enter system view. 2. Enter OSPFv3 view. 3. Enter OSPFv3 area view. 4. Configure the area as a stub area. 5. (Optional.) Specify a cost for the default route advertised to the stub area. Command system-view ospfv3 [ process-id | vpn-instance vpn-instance-name ] * area area-id stub [ default-route-advertise-always | no-summary ] * default-cost value Remarks N/A N/A N/A By default, no stub area is configured as a stub area. The default setting is 1. Configuring an OSPFv3 virtual link You can configure a virtual link to maintain connectivity between a non-backbone area and the backbone, or in the backbone itself. IMPORTANT: • Both ends of a virtual link are ABRs that must be configured with the vlink-peer command. • Do not configure virtual links in the areas of a GR-capable process. 302