Incorrect value of s->pref_routes in nest/proto.c

Ondrej Zajicek santiago at crfreenet.org
Fri Apr 1 13:12:19 CEST 2016


On Fri, Apr 01, 2016 at 01:41:10PM +0300, Alexander Shikov wrote:
> Hello!
> 
> I got 9 routes in T_ITCONS table, 2 of them are exported to master table:
> 
> bird> show route
> 195.78.38.0/23     via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS28773i]
> 188.190.160.0/19   via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS28773i]
> bird> show route table T_ITCONS
> 109.68.40.0/21     via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS25372i]
> 80.78.63.0/24      via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS60359i]
> 185.102.164.0/22   via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS29242i]
> 185.102.164.0/24   via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS29242i]
> 194.247.174.0/24   via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS196831i]
> 194.247.175.0/24   via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS196831?]
> 193.84.72.0/24     via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS39851i]
> 195.78.38.0/23     via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS28773i]
> 188.190.160.0/19   via 193.25.180.17 on vlan777 [ITCONS 2016-03-31 18:11:33] * (100) [AS28773i]
> 
> 
> 'show protocol all ITCONS' shows sum of them, i.e. 11 preferred routes and that is incorrect:

Hi

This is an expected value, BIRD just counts the number of preferred pairs
(route, table). If a route is preferred in multiple tables, it is counted
multiple times.

The 'preferred' stat is a bit odd, we will probably remove it in the future.

-- 
Elen sila lumenn' omentielvo

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