Syntax for show route and primary route (*)?

[Kenth Eriksson]

On Wed, 2019-10-23 at 13:38 +0200, Ondrej Zajicek wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> On Wed, Oct 23, 2019 at 09:11:31AM +0000, Kenth Eriksson wrote:
> > Hi!
> > 
> > When showing routing table, the output can have '*', '!' or empty depending on the route. I thought that the asterisk ('*')
> > meant that the route is a primary route installed into the kernel. But this does not seem to always be true, e.g.
> 
> Hi
> 
> The asterisk means the route is selected as best (i.e. is the first of
> routes for the same network). This does not mean that the route is
> exported to kernel. For example in route reflectors / route servers, a
> route is selected as best and propagated to BGP peers, but no Kernel
> protocol is configured.
> 
> But i do not understand the cases below, where there is no other route
> for that network and the only route does not have asterisk.

Simplest of use case, its a default route from the kernel. But still no
asterisk. Below is a gdb trace in function rt_show_rte

gdb) print ia
$1 = (byte *) 0xffc6c3ab "0.0.0.0/0"
(gdb) print e
$2 = (rte *) 0x56939d14
(gdb) print e->net->routes
$3 = (struct rte *) 0x56939c54
(gdb) print e->next
$4 = (struct rte *) 0x0

Obviously e->net->routes is not equal to e, thus no asterisk. 

/k 

> 
> > consider the following:
> > 
> > bird> show route 0.0.0.0/0
> > Table master4:
> > 0.0.0.0/0            unicast [kernel1 2019-10-22] (215)
> >       via 10.210.137.1 on eth1
> 
> --
> 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."