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тАО12-13-2006 11:40 PM
тАО12-13-2006 11:40 PM
Why do our ProCurve switches send out RSTP BPDU's on edge-ports every 2 seconds?
I know that a bridge should send BDPU's every
Solved! Go to Solution.
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тАО12-14-2006 08:59 AM
тАО12-14-2006 08:59 AM
SolutionAs long as spanning-tree is enabled throughout your network on all ports, then it should prevent most of those types of problems from occurring.
I guess another answer to your question is that it sends BPDU's to all devices because it simply doesn't know for sure what ports are connected to other switches. It's better for it to be safe than sorry.
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тАО12-14-2006 07:04 PM
тАО12-14-2006 07:04 PM
Re: BPDU on edge-port?
That's what I expected to hear, but not really what I wanted :)
It's no big deal, so I'm leaving it here.
Anders :)
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тАО12-14-2006 08:01 PM
тАО12-14-2006 08:01 PM
Re: BPDU on edge-port?
I'm intrigued as to what you wanted to hear...
Instead of spanning-tree protecting your edge-ports, there is a new feature that's starting to become available on the new switches 'loop-protection'. So you could use the BPDU filter and loop-protection simultaneously to stop spanning-tree packets but still be protected from accidental loops.
My basic understanding of how the loop-proteciton feature works is that it sends multicast frames, if the frame is received back on the same switch, the port is disabled.
This feature is useful because some switches 'eat' BPDU's, so in the scenario I mentioned earlier, even if that pesky end-user brought in their own switch and created a loop, if the BPDU's are getting eaten then the port is not going to be blocked and the loop is going to take down your network.
Either way, if you replace one feature with the other you're still going to have some extra traffic going out that port!
Matt
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тАО12-14-2006 08:12 PM
тАО12-14-2006 08:12 PM
Re: BPDU on edge-port?
Thus, a port that was established as an edge port won't change unless it also looses link.
If that argument holds, it should only be necessary to send BPDUs some short time after link establishment.
That would save a few million packets a day, in our tiny network alone.
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тАО12-14-2006 08:35 PM
тАО12-14-2006 08:35 PM
Re: BPDU on edge-port?
I'm also at the limit of my expertise and I'm really just saying what makes sense to me (these may not be the reasons for it at all).
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тАО12-17-2006 08:52 PM
тАО12-17-2006 08:52 PM
Re: BPDU on edge-port?
I guess it stretches the reach of STP (as I understand it) a bit, since it involves loop detection on/through a non-STP switch.
I always figured that sending BPDUs was only meaningful when there is another STP bridge at the other end.
Thanks for enlightening me :)
Anders