Date: Wed, 02 Aug 2006 07:33:26 +0200 From: Ian FREISLICH <if@hetzner.co.za> To: Tyrone.VanDerHaar@TelecityRedbus.se Cc: freebsd-ipfw@freebsd.org Subject: Re: CARP spanning-tree Vlan Message-ID: <E1G89ME-000H0o-8A@hetzner.co.za> In-Reply-To: Message from <Tyrone.VanDerHaar@TelecityRedbus.se> of "Tue, 30 May 2006 16:31:35 %2B0200." <D3BBF0C6F2FC0448BFCA2F965F2192631DEBB5@sto1.tcy.prv>
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Tyrone wrote: > Can anyone explain to me why I can't get my CARP interfaces up again > after changing the spanning-tree version on our customer switch? Did you ever get this working? Since your message, I started playing around with CARP and I've noticed a few things. 1. Renaming a CARP interface makes it either loose it's vhid/pass or stops it working for some other reason. 2. Downing and upping the physical interface makes the carp interface stop working. > We have 2x switches connected to our freebsd routers and a fibre link > between the switches. > > Customer have a port on each switch going to a third switch and between > the 3 switches we have spanning tree running for redundant paths. > > I changed the spanning-tree on the customer switch (switch 3) and now my > carp interface look like this > > carp135: flags=3D49<UP,LOOPBACK,RUNNING> mtu 1500 > > inet xxx.xxx.xxx.2 netmask 0xffffff00 > > carp: MASTER vhid 7 advbase 1 advskew 100 > > carp135: flags=3D49<UP,LOOPBACK,RUNNING> mtu 1500 > > inet xxx.xxx.xxx.2 netmask 0xffffff00 > > carp: MASTER vhid 7 advbase 1 advskew 0 I've noticed that my carp intefaces do this when: 1. The switch stops forwarding 2. The firewall blocks the carp broadcast 3. The carp inteface is "in" a vlan interface and vlanhwtag is enabled on the card and the interface is placed in promiscuous mode - the carp driver does this. (the card just stops tagging frames). 4. The inteface the carp inteface is "in" was downed and upped. 3 and 4 can be fixed by re-ifconfig of all the interfaces involved. It sounds more like this is a switch issue and that the carp broadcasts aren't making it through from your one router to the other. What is the interface state of the STP on all your switches? Ian -- Ian Freislich
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