bird 1.5.0-4 ospf Inactivity timer expired.

Ondrej Zajicek santiago at
Mon Oct 26 14:47:30 CET 2015

On Mon, Oct 26, 2015 at 05:40:08PM +0600, Andrey Kitsul wrote:
> Why ospf restart? Dead interval 4sec not been reached.

Well, it is counted from the last received hello, so you have to add 'packets'
to OSPF debug to see when it started.

Also timers in BIRD have generally second granularity, so 4 sec timer may
timeout in some cases in 3.1 sec. And there is also one minor bug that may
cause some timers to te triggered ~1 s earlier.

So all these factors together, 4 s (or smaller) dead timers in BIRD
may be unreliable. I would suggest at least 8-10 s.

Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3,
"To err is human -- to blame it on a computer is even more so."
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