LLGR De-Preferencing

[Matt Corallo]

It appears bird (2.17.1) doesn't implement the required LLGR de-preferencing logic, eg in a simple 
test environment with LLGR and one (otherwise-preferred) session down, bird shows it as still 
selected even though it has the stale flag (see below). Is there any way to do the required 
de-preferencing with filters or would a patch to implement this be simple?

Thanks.

bird> show route for 69.59.18.0 all
Table master4:
69.59.18.0/24        unicast [localsyncb 17:06:58.262 from 10.242.243.12] * (101s) [AS397444i]
	Type: BGP univ
	BGP.origin: IGP
	BGP.as_path: 397444
	BGP.next_hop: ....
	BGP.local_pref: 101
	BGP.community: (65535,6)
                      unicast [localsync 2025-11-30 from 10.242.242.12] (100) [AS397444i]
	Type: BGP univ
	BGP.origin: IGP
	BGP.as_path: 397444
	BGP.next_hop: ....
	BGP.local_pref: 100