Syntax for show route and primary route (*)?

[Kenth Eriksson]

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.
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
bird> show route ::0/0
Table master6:
::/0                 unicast [static_ipv6 2019-10-22] * (255)
        via 2a02:1420:1:137::1 on eth1
bird> 

Why does the default route for IPv6 have a '*' but not for IPv4?

Another example where a route pushed to the kernel is not having the '*' mark;

bird> show route 10.210.138.64/30
Table master4:
10.210.138.64/30     unicast [ospfv2_1 16:50:34.613] I (145/20) [10.210.138.65]
        via 10.210.138.66 on p1-2-9-10g0
bird> q

~ # route | grep 10.210.138.64
10.210.138.64   10.210.138.66   255.255.255.252 UG    32     0        0 
p1-2-9-10g0
~ # 

Thanks,
Kenth