[FROG] IPv6 link-local addresses in the RIB

[Donald Sharp]

FRR currently only has the ability to select one route entry as
selected per prefix.  Fixing this has implications for both route
selection as well as nexthop tracking.  Nothing insurmountable just
programming and working through the places this would cause changes in
behavior.  As it stands this bugs me too but I have not come up with a
scenario where this is truly affecting routing behavior other than
from a display/small confusion perspective.

donald

On Wed, Dec 16, 2020 at 5:25 AM Stephen Glaus <snglaus at gmail.com> wrote:
>
> Apologies if I'm missing something simple here, but can anyone tell me why (in the output below) only one link-local address is shown as selected when all have been installed in the FIB?
>
> dut-2# sh ipv rou
> Codes: K - kernel route, C - connected, S - static, R - RIPng,
>        O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
>        v - VNC, V - VNC-Direct, A - Babel, D - SHARP, F - PBR,
>        f - OpenFabric,
>        > - selected route, * - FIB route, q - queued route, r - rejected route
>
> C>* 1::1/128 is directly connected, lo1, 00:14:00
> C>* 1::2/128 is directly connected, lo2, 00:13:58
> C>* 1::3/128 is directly connected, lo3, 00:14:01
> C>* 10:1::/64 is directly connected, dp0p193p1, 00:06:42
> S>* 10:2::/32 [1/0] via 192:168:1::2, dp0p256p1, weight 1, 00:06:41
> S>* 51:1:1::/64 [1/0] via 192:168:1::2, dp0p256p1, weight 1, 00:06:41
> C>* 192:168:1::/64 is directly connected, dp0p256p1, 00:06:42
> S>* 200:1::/32 [1/0] via 10:1::2, dp0p193p1, weight 1, 00:06:41
> C * fe80::/64 is directly connected, dp0p192p1, 00:06:41
> C * fe80::/64 is directly connected, dp0p193p1, 00:06:42
> C * fe80::/64 is directly connected, dp0p256p1, 00:06:42
> C * fe80::/64 is directly connected, dp0p224p1, 00:06:47
> C * fe80::/64 is directly connected, lo2, 00:13:59
> C * fe80::/64 is directly connected, lo1, 00:14:00
> C>* fe80::/64 is directly connected, lo3, 00:14:02
> dut-2#
>
> Thanks in advance...Steve
>
>
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