How can faster OSPF convergence be achieved

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OSPF convergence speed is affected by the following factors:

A device detects that the peer link is down and the neighbor relationship becomes invalid;
A new link-state advertisement (LSA) is generated and flooded;
The Link State Database (LSDB) is updated. A new route is calculated through the Shortest Path First (SPF) routing algorithm and delivered to the Forwarding Information Base (FIB) table.
For faster OSPF convergence, you can adjust the following options on the switch:

Shorten the hello interval and dead interval of the neighbor, or configure Bidirectional Forwarding Detection (BFD) for fast failure detection;
Decrease the spf-schedule-interval (five seconds by default) to shorten the time interval between two SPF algorithm operations;
Shorten the LSA generation interval;
Shorten the interval of detecting LSA arrival;
On the interface, run the ospf trans-delay command to speed up the flooding of LSAs.

Other related questions:
OSPF convergence time on the firewall
You can configure the ospf timer deadseconds command on the interface to change the time. The default convergence time is as follows: point-to-point: 40 seconds broadcast: 40 seconds point-to-multipoint: 120 seconds non-broadcast: 120 seconds

Configure an S series switch to accelerate OSPF route convergence
The following network changes affect OSPF route convergence. A device detects that the peer link is down and the neighbor relationship becomes invalid. A new link-state advertisement (LSA) is generated and flooded. The Link State Database (LSDB) is updated. A new route is calculated through the Shortest Path First (SPF) routing algorithm and delivered to the Forwarding Information Base (FIB) table. To accelerate OSPF aggregation, you can perform the following operations on a switch: Set a Hello interval and a Dead interval on the peer device or configure the BFD to rapidly detect failures. Set spf-schedule-interval (of which the default value is 5, in seconds) to a smaller value to shorten the SPF calculation interval. Set the LSA generation interval to a smaller value. Set the LSA arrival check interval to a smaller value. Run the ospf trans-delay command in an interface view to speed up LSA flooding.

how to achieve billing function on U1900
U1900 series unified gateway only supports generating bill file and sent to the CDR server, which share these CDR file to the 3rd party billing system or BMU through FTPS. The billing function is provided by the 3rd party billing system or BMU.

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