Hello, all
I got a weird question. We recently migrated two our routers from CentOS
7 to Debian 10, installed Bird, placed config files back - and since
then we are observing BGP flaps.
Moreover, flaps are observed on IPv6 peers only:
Name Proto Table State Since Info
device1 Device --- up 2021-03-18 15:42:27
direct1 Direct --- up 2021-03-18 15:42:27
kernel1 Kernel master4 up 2021-03-18 15:42:27
kernel2 Kernel master6 up 2021-03-18 15:42:27
static1 Static master4 up 2021-03-18 15:42:27
static2 Static master6 up 2021-03-18 15:42:27
UPLINK BGP --- up 2021-03-18 15:42:31 Established
UPLINKv6 BGP --- up 2021-03-22 21:11:12 Established
AR1 BGP --- up 2021-03-18 15:42:31 Established
AR1v6 BGP --- up 2021-03-19 23:42:55 Established
AR2 BGP --- up 2021-03-18 15:42:28 Established
AR2v6 BGP --- up 2021-03-20 15:37:38 Established
BR2 BGP --- up 2021-03-18 15:42:28 Established
BR2v6 BGP --- up 2021-03-21 11:03:33 Established
ospf4 OSPF master4 up 2021-03-18 15:42:27 Running
ospf6 OSPF master6 up 2021-03-18 15:42:27 Running
Flaps are unregular, currently we saw no coincedences with anything. The
network is stable, our and peers configs were not changed, Bird version
too (2.0.7 on both CentOS and Debian).
The only message about this in logs is hold-related:
2021-03-22 21:01:10 <WARN> Kernel dropped some netlink messages, will
resync on next scan.
2021-03-22 21:04:33 <WARN> Kernel dropped some netlink messages, will
resync on next scan.
2021-03-22 21:06:10 <WARN> Kernel dropped some netlink messages, will
resync on next scan.
2021-03-22 21:10:12 <RMT> UPLINKv6: Error: Hold timer expired
2021-03-22 21:10:13 <WARN> Kernel dropped some netlink messages, will
resync on next scan.
2021-03-22 21:10:15 <WARN> Kernel dropped some netlink messages, will
resync on next scan.
2021-03-22 21:10:16 <WARN> Kernel dropped some netlink messages, will
resync on next scan.
2021-03-22 21:10:16 <WARN> Kernel dropped some netlink messages, will
resync on next scan.
Could you please suggest some way to go except of returning to CentOS?
Thank you in advance.
_--
