Regression in vr - not receiveing multicast

Pyun YongHyeon pyunyh at gmail.com
Thu Dec 11 17:31:17 PST 2008


On Wed, Dec 10, 2008 at 08:06:16AM +0100, Goran Lowkrantz wrote:
 > --On December 9, 2008 12:53:05 +0100 Goran Lowkrantz 
 > <glz at hidden-powers.com> wrote:
 > 
 > >--On December 9, 2008 20:47:23 +0900 Pyun YongHyeon <pyunyh at gmail.com>
 > >wrote:
 > >
 > >>On Tue, Dec 09, 2008 at 10:40:17AM +0100, Goran Lowkrantz wrote:
 > >> > Hi,
 > >> >
 > >> > in July, vr had this problem and was fixed:
 > >> > <http://www.FreeBSD.org/cgi/query-pr.cgi?pr=125010>
 > >> > <http://www.FreeBSD.org/cgi/query-pr.cgi?pr=125024>
 > >> >
 > >> > but now it's back again!
 > >> >
 > >>
 > >>There was just one bug fix since then and I guess the fix is not
 > >>related with your issue.
 > >>
 > >> > On a system with the following:
 > >> > 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #3: Thu Oct 16 12:31:04 UTC 2008
 > >> >
 > >> > I have to set all vr interfaces in promisc to get routing info.
 > >> >
 > >> > Using Quagga
 > >> > # pkg_info -Ix uagga
 > >> > quagga-0.99.10_3    Free RIPv1, RIPv2, OSPFv2, BGP4, IS-IS route
 > >>software  >
 > >> > on an inner network using RIPv2
 > >> > # ifmcstat -i vr0
 > >> > vr0:
 > >> > 	inet xxx.xxx.xxx.xxx
 > >> > 		group 224.0.0.9
 > >> > 			igmpv2
 > >> > 			mcast-macaddr 01:00:5e:00:00:09 refcnt 1
 > >> > 		group 224.0.0.1
 > >> > 			mcast-macaddr 01:00:5e:00:00:01 refcnt 1
 > >> >
 > >> >
 > >> > On the same box, we have some em devices also and they work without
 > >>any   > problems.
 > >> >
 > >>
 > >>There is fundamental differences between em(4) and vr(4). The
 > >>vr(4) for VT6105M takes advantage of perfect multicast filtering
 > >>feature which is not present on all em(4) interface. Perfect
 > >>multicast filtering can reduce unwanted multicast traffics such
 > >>that it could save a lot of CPU cycles. The downside is that vr(4)
 > >>cannot accept multicast frames for a multicast group without
 > >>joining the multicast group first.
 > >>For multicast routing purpose I guess 'options MROUTING' kernel
 > >>option should be enabled to accept all multicast frames.
 > >>Does your kernel have that option?
 > >
 > >No it has not. I will create such a beast and return with stories.
 > >
 > 
 > 
 > I have tried with 'options MROUTING' and it didn't work.
 > 
 > Did I miss something? Do I have to install and run mrouted also?
 > 
 > It seems like maybe the first two packages are accepted after registration 
 > as I don't lose the routes until after about 6 min uptime. But to get 
 > further updates, I need the interfaces in promisc.
 > 
 > So, next step?


FYI: I've disabled multicast perfect filtering(r185962).
-- 
Regards,
Pyun YongHyeon


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