A friend has asked me to find out if anyone on Nanog is using Zebra (a gated replacement) and, if so, to ask for their assessment of the program.
Tim McKee
I've been using it for a couple of years. If you don't mind playing with
a bleeding edge with minimal end user support (but lots of heavy duty code
tuning going on) and some quirks that are quickly being ironed out, it's a
heck of a good thing. I cut myself on it occaisionally, but more out of my
ignorance than because it has problems. I've used it on Alpha's and Intel
Boxen running Linux and oddball hardware including LMC's DS3 Cards.
I currently have a problem with my last kernel compile not getting route
updates properly, but I think I unchecked the 'make it work' switch.
It has a very active, intelligent and dedicated development team. I am
anxious for version 1.0 
I have been using it for a few months now to announce my personal
netblocks. Works fine:
home# sho ip bgp summary
BGP router identifier 213.136.9.165, local AS number 12859
2 BGP AS-PATH entries
1 BGP community entries
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
213.136.9.162 4 12859 7138 7146 0 0 0 00:01:34 Connect
213.136.9.166 4 12859 10310 10310 0 0 0 6d10h17m 3
The first one is my cable connection (which as you can see is down). I did
not notice it until I looked at my stats to paste it here
i'm using it in several places for full, multiple view BGP. 90k+ routes,
multiple peers.
i use it to manage my TorIX connection with some 20+ peers.
the OSPF support is a bit wonky, but it works as well.
I'm using zebra since a couple of months mainly for use as route server.
zebra (cvs release) now supports full RS feature like "transparent"
next-hop, AS and MED. It's running on a Fujitsu-Siemens N100 / Solaris8. No
problems with compilation. Bugs are removed within a day or so. Great stuff.
Arnold
Been using it for years. Rick Payne is the one who should be on Nanog with
the most 'internal' experience, but from a user perspective it works well. I
run a number of networks for my own company and other clients with this on
Ethernet and some E1 lines - all on OpenBSD. Fine with some issues - but
nothing major.
Features currently going in include peer-group support - finally.
rgds,