2018-02-16 04:12, William Herrin написав:
On Thu, Feb 15, 2018 at 7:05 PM, <b...@it-mark.net> wrote:
2018-02-15 22:21, Alexis Rosen написав:
On Feb 15, 2018, at 8:29 AM, b...@it-mark.net wrote:
But once every minute for about 3-10 seconds there is a "BGP general
scanning", which is arbitrarily executed on any of the processor
cores and
loads it 100% within a specified time.
But can this idea be realized at all? Just by default, bgp-scan occurs
every
minute and it can only be changed by specifying the interval from 5 -
60
seconds. And it seems that it's impossible to turn off this feature at
all?
The BGP scanner performs next-hop validation. Where the next hop is
not your direct eBGP peer, the scanner is what figures out that routes
are no longer reachable and picks new next-hops via which they are.
If you have a trivial configuration where your BGP next hop is always
your single, directly adjacent BGP peer, you can probably tweak the
software to allow a longer timer and recompile it without ill effect.
If you have more than one BGP router, multiple peers, or a multihop
BGP configuration then you should probably leave well enough alone.
If it's causing latency issues for other software on the server, you
can consider running it with the "nice" command.
Thank you Bill for advice.
I thought there is a command that turns off the function bgp-scan. But
you say that I need to recompile...
I solved the problem by transferring the bgpd process to a separate core
(taskset command) and changing the priority using "nice".
The problem is resolved, only now the corresponding core is idle :) But
this is not a problem yet.
But still the question. I have 4 bgp-neighbors in the "direct
visibility" ethernet - for each bgp-connection there is a subnet /30,
where is one ip - my router, other ip - bgp-neighbor. Does this
configuration allow me to refuse the "bgp-scan" function in your
opinion?
Regards,
Bill Herrin
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