Date: Sat, 25 Aug 2012 19:04:03 -0400 From: "Dustin J. Mitchell" <dustin@v.igoro.us> To: freebsd-net@freebsd.org Subject: bridging VLAN interfaces and STP Message-ID: <CAJtE5vRq8oJz1f8ujsTSjGJjoEMp_J-n6Nqj0YCUd_nrScnPqA@mail.gmail.com>
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Hey folks. I'm trying to set up a system with one 802.1q-tagged upstream, and a few untagged interfaces. So I'd like to bridge the vlan(4) interfaces on vr1 to specific other interfaces. hilbert ~ # ifconfig bridge10 bridge10: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 ether 02:f4:a1:63:5a:0a inet 172.16.1.21 netmask 0xffffff00 broadcast 172.16.1.255 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15 maxage 20 holdcnt 6 proto rstp maxaddr 100 timeout 1200 root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0 member: vr3 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 4 priority 128 path cost 55 member: vr2 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 3 priority 128 path cost 55 member: vr1.10 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 8 priority 128 path cost 200000 Now, if I try to enable STP on these: hilbert ~ # ifconfig bridge10 stp vr2 hilbert ~ # ifconfig bridge10 stp vr3 hilbert ~ # ifconfig bridge10 stp vr1.20 ifconfig: unable to get bridge flags: No such file or directory and, indeed, the first two succeeded and the third did not: ... member: vr3 flags=147<LEARNING,DISCOVER,STP,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 4 priority 128 path cost 55 proto rstp role disabled state discarding member: vr2 flags=147<LEARNING,DISCOVER,STP,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 3 priority 128 path cost 55 proto rstp role disabled state discarding member: vr1.10 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 8 priority 128 path cost 200000 I tried a bridge interface with vlan'd members only (vr2.10 and vr1.10, to be exact), and still saw this error. So it looks like you can't run STP on vlan interfaces? Can someone confirm? Or is there a secret sysctl to enable this? I'll admit this is a minor point - I'll just leave STP off and not make loops - but it'd be nice to do the right thing :) Dustin
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