Question about logging with 3.0.1

Nigel Kukard via Bird-users Mon, 24 Feb 2025 07:56:32 -0800

Hi there,

I'm wondering if anyone has seen excessive filter logging with 3.0.0/3.0.1?

Comparing log output from tests done on v2 vs v3, I'm seeing 2G+ log files generated in 30s on v3, when in v2 the log files were only a few hundred Kb in size at most after some time.

I have router R1 and R2 connected via BGP. I have a couple of filters which log if a prefix has been filtered or accepted, I've included my log configuration and filter below.


Here is the log config I'm using...


log "/var/log/bird.log" { info, warning, fatal };
debug protocols { states, routes, filters, interfaces, events };
timeformat base iso long;
timeformat log iso long;
timeformat protocol iso long;
timeformat route iso long;


Here is the test filter I created to test...

define DEFAULT_ROUTE_V4 = 0.0.0.0/0;
define DEFAULT_ROUTE_V6 = ::/0;

function is_default(string filter_name) -> bool {

if ((net.type = NET_IP4 && net = DEFAULT_ROUTE_V4) || (net.type = NET_IP6 && net = DEFAULT_ROUTE_V6)) then

        return true;
    return false;
}

function bgp_accept_bgp(string filter_name) -> bool {
    if (is_default()) then return false;

print filter_name, " [bgp_accept_bgp] Accepting BGP route ", net, " from ", proto;

    accept;
}

filter f_bgp_master_export
string filter_name;
{
  filter_name = "f_bgp_master_export";
  bgp_accept_bgp(filter_name);
  reject;
};


Here is the odd behavior I"m observing in v3...

2025-02-24 15:21:04 [0002] <INFO> f_bgp_master_export [bgp_accept_bgp] Accepting BGP route 100.111.0.0/24 from bgp4_AS65000_r1 2025-02-24 15:21:04 [0002] <INFO> f_bgp_master_export [bgp_accept_bgp] Accepting BGP route 100.112.0.0/24 from bgp4_AS65000_r1 2025-02-24 15:21:04 [0002] <INFO> f_bgp_master_export [bgp_accept_bgp] Accepting BGP route 100.113.0.0/24 from bgp4_AS65000_r1 2025-02-24 15:21:04 [0002] <INFO> f_bgp_master_export [bgp_accept_bgp] Accepting BGP route 100.201.0.0/24 from bgp4_AS65000_r1 2025-02-24 15:21:04 [0002] <INFO> f_bgp_master_export [bgp_accept_bgp] Accepting BGP route 100.131.0.0/24 from bgp4_AS65000_r1 2025-02-24 15:21:04 [0002] <INFO> f_bgp_master_export [bgp_accept_bgp] Accepting BGP route 100.132.0.0/24 from bgp4_AS65000_r1


repeating very many times per second...


In about 30s my log file grew to 2.1GB before I stopped the process.

Perhaps I'm missing something in the migration guide? any help would be greatly appreciated.


Kind Regards
Nigel

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Question about logging with 3.0.1

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