Setting the Convergence Priority of OSPF Routes
Context
With the integration of network services, different services such as data, voice, and video run on the same network infrastructure, but them have different requirements on the network. For Video on Demand (VoD) services, the route convergence speed of the multicast source server is the most critical factor that affects multicast services. It is required that the routes to the multicast source converge rapidly when network faults occur. On the BGP or MPLS VPN bearer network where OSPF is used to implement the IP connectivity of the backbone network, end-to-end routes between PEs need to converge rapidly.
You can set the convergence priority of certain OSPF routes to a larger value so that these routes converge preferentially. This shortens the interruption of key services and improves the reliability of the entire network.
Procedure
- Run system-view
The system view is displayed.
- Run ospf [ process-id ]
The OSPF view is displayed.
- Run prefix-priority { critical | high | medium } ip-prefix ip-prefix-name
The convergence priority of certain OSPF routes is set.
After the convergence priority of certain OSPF routes is set, OSPF can calculate and flood LSAs, and synchronize LSDBs according to the priority. This speeds up the route convergence. When an LSA meets multiple priorities, the highest priority takes effect. Before a convergence priority is set, OSPF calculates LSAs based on the routes carried in them, namely, in the sequence of intra-area routes, inter-area routes, and AS external routes. This command makes OSPF calculate the three types of routes separately according to the specified route calculation priorities. Convergence priorities include critical, high, medium, and low. During LSA flooding, LSAs are placed into the corresponding critical, high, medium, and low queues based on their priorities, which speeds up the processing of high-priority LSAs.
This command takes effect only on the public network.
- Run commit
The configuration is committed.
