HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 69
Configuring a stub area, Enable OSPF.
View all HP 6125XLG manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 69 highlights
• Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes. • Enable OSPF. Configuring a stub area You can configure a non-backbone area at an AS edge as a stub area. To do so, issue the stub command on all routers attached to the area. The routing table size is reduced because Type-5 LSAs will not be flooded within the stub area. The ABR generates a default route into the stub area so all packets destined outside of the AS are sent through the default route. To further reduce the routing table size and routing information exchanged in the stub area, configure a totally stub area by using the stub [ no-summary ] command on the ABR. AS external routes and inter-area routes will not be distributed into the area. All the packets destined outside of the AS or area will be sent to the ABR for forwarding. A stub or totally stub area cannot have an ASBR because external routes cannot be distributed into the area. Virtual links cannot transit a stub area or totally stub area. To configure an OSPF stub area: Step 1. Enter system view. Command system-view Remarks N/A 2. Enter OSPF view. ospf [ process-id | router-id router-id | vpn-instance vpn-instance-name ] * N/A 3. Enter area view. area area-id N/A 4. Configure the area as a stub stub area. [ default-route-advertise-always By default, no stub area is configured. | no-summary ] * 5. (Optional.) Specify a cost for the default route default-cost cost advertised to the stub area. The default setting is 1. The default-cost cost command takes effect only on the ABR of a stub area or totally stub area. Configuring an NSSA area A stub area cannot import external routes, but an NSSA area can import external routes into the OSPF routing domain while retaining other stub area characteristics. Do not configure the backbone area as an NSSA area or totally NSSA area. To configure an NSSA area, configure the nssa command on all the routers attached to the area. To configure a totally NSSA area, configure the nssa command on all the routers attached to the area and configure the nssa no-summary command on the ABR. The ABR of a totally NSSA area does not advertise inter-area routes into the area. Virtual links cannot transit a stub area or totally stub area. To configure an NSSA area: 58