Hi,

Some extra Info: I’ve changed the scan time from 20 to 60 on the kernel and the CPU load on the machine has reduced, but I still see too many route changes.

Thanks!

Saludos Cordiales,

Xavier Trilla P.

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De: Bird-users <bird-users-bounces@network.cz> En nombre de Xavier Trilla
Enviado el: martes, 8 de mayo de 2018 14:02
Para: bird-users@network.cz
Asunto: Constant delete / add route after upgrade to 1.6.3

Hi,

We’ve upgraded recently to 1.6.3 (We were using 1.2.5, which we had running for like 8 years!) and after the upgraded we are seeing a weird behavior.

When running ip monitor route in the machine, looks like bird is constantly removing and adding routes, which could be considered normal, but the thing is that it deletes a route and then adds the same route again (Those routes are received via BGP):

Heres an example:

103.72.2.0/24 via 91.126.95.153 dev vlan111 proto bird

Deleted 103.72.1.0/24 via 91.126.95.153 dev vlan111 proto bird

103.72.1.0/24 via 91.126.95.153 dev vlan111 proto bird

Deleted 177.75.72.0/24 via 91.126.95.153 dev vlan111 proto bird

177.75.72.0/24 via 91.126.95.153 dev vlan111 proto bird

Deleted 185.165.122.0/24 via 91.126.95.153 dev vlan111 proto bird

185.165.122.0/24 via 91.126.95.153 dev vlan111 proto bird

Deleted 196.46.242.0/24 via 91.126.95.153 dev vlan111 proto bird

196.46.242.0/24 via 91.126.95.153 dev vlan111 proto bird

Deleted 64.70.30.0/24 via 91.126.95.153 dev vlan111 proto bird

64.70.30.0/24 via 212.80.191.185 dev vlan2 proto bird

At the same time we are seeing the following messages on bird log:

May 8 13:56:39 icewall-01 bird: Kernel dropped some netlink messages, will resync on next scan.

May 8 13:57:02 icewall-01 bird: Kernel dropped some netlink messages, will resync on next scan.

May 8 13:57:27 icewall-01 bird: Kernel dropped some netlink messages, will resync on next scan.

May 8 13:57:32 icewall-01 bird: Kernel dropped some netlink messages, will resync on next scan.

May 8 13:57:59 icewall-01 bird: Kernel dropped some netlink messages, will resync on next scan.