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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access

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Priority-based Route Convergence

Priority-based Route Convergence


Priority-based route convergence is an important technology that improves network reliability. It provides faster route convergence for key services. For example, to minimize the interruption of key services in case of network faults, real-time multicast services require that the routes to the multicast source quickly converge, and the Multiprotocol Label Switching (MPLS) VPN bearer network requires that routes between PEs also quickly converge.

Convergence priorities provide references for the system to converge routes for service forwarding. Different routes can be set with different convergence priorities, which can be identified as critical, high, medium, and low listed in descending order.


With the integration of network services, requirements on service differentiation increase. Carriers require that the routes for key services, such as Voice over IP (VoIP) and video conferencing services converge faster than those for common services. Therefore, routes need to converge based on their convergence priorities to improve network reliability.

Route Convergence Priority

Table 2-3 lists the default convergence priorities of public network routes. You can set convergence priorities for routes based on the requirements of a live network.

Table 2-3 Default convergence priorities of public network routes

Routing Protocol or Route Type

Convergence Priority





32-bit host routes of OSPF and IS-IS


OSPF route (except 32-bit host routes)


IS-IS route (except 32-bit host routes)







For VPN route priorities, only 32-bit host routes of OSPF and IS-IS are identified as medium, and the other routes are identified as low.


Figure 2-3 shows networking for multicast services. An IGP runs on the network; Device A is the receiver, and Device B is the multicast source server with IP address The route to the multicast source server is required to converge faster than other routes, such as In this case, you can set a higher convergence priority for than that of Then, when routes converge on the network, the route to the multicast source server converges first, ensuring the transmission of multicast services.

Figure 2-3 Networking for priority-based route convergence

Updated: 2019-01-04

Document ID: EDOC1100059473

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