[BGPCEP-658] BGP UPDATE route advertised slowly

Tue, 16 Nov 2021 06:36:23 +0000

The BGP routes advertised very slowly when there are many routes in route table (200,000 routes). The advertise process takes hours and still not able to finish.

Problem:

200,000 routes in total.
4 routers are synced with controller.
After all the routes are synced with the controller, restart one of the 4 routers. The rebooted router receives route very slowly.

There is no ERROR or WARN in the karaf log.
The wireshark capture shows a lot of retransmission for the UPDATE message.

I am suspecting the HIGH WATERMARK or LOW WATERMARK is too high caused the netty channel sent out too much data at a time. With some congestion on the network, netty fails to transmit all the UPDATE message efficiently.

OpenDaylight JIRA

[BGPCEP-658] BGP UPDATE route advertised slowly