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Is bgp not stable?
Hello. Help to understand with constantly falling bgp routing. Available at the fortigate office, at a remote Mikrotik point. Configured ipip tunnel + ipsec + bgp. Often bgp crashes with "Hold Timer expired" error. In peer bgp, the values are Hold Time = 90, Keepalive time = 30. Respectively, on both sides. In the ipsec -> profile -> DPD interval = 120 s settings. DPD max Failures = 5. Please, if there is not enough data, write what else is required.
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I recommend google bgp troubleshooting guide, there are many techniques and reasons. I met problems with MTU, with a table that was too large during a full update (clogged the channel), with blocking on firewalls, with incorrectly set bfd timers, with drops due to channel overload (it is necessary to paint signaling traffic), with incorrect routing of bgp traffic .. .
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