port-sparc/51981: be SBUS ethernet not getting IPv6 autoconf address (likely mcast issue)

[brandon%burn.net@localhost]

>Number:         51981
>Category:       port-sparc
>Synopsis:       be SBUS ethernet not getting IPv6 autoconf address (likely mcast issue)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-sparc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 17 19:50:00 +0000 2017
>Originator:     Brandon Applegate
>Release:        7.0.2
>Organization:
Brandon Applegate
>Environment:
NetBSD ipx-1.internal.burn.net 7.0.2 NetBSD 7.0.2 (GENERIC.201610210724Z) sparc
>Description:
When using a be SBUS ethernet card - an automatic (i.e. RS / RA) IPv6 address does not get assigned.  Testing the onboard le ethernet in the same machine this works fine.

I see the RS go out, but the machine doesn't recognize the RA.
>How-To-Repeat:
- Have a be ethernet card
- Configure system for IPv6 autoconf (either through rtsold OR dhcpcd)
- Observe that no global address is assigned to the interface
>Fix: