From: ccie2k4@gmail.com
Date: Wed Jul 04 2007 - 19:16:24 ART
Hi Folks,
Just trying to get an idea of how SPT and BPDU guard would affect this
scenario. Say I have 2 * 3550 switches and I am using one as a pure L2
switch while the other one is being used as a router.
Can I connect them without using a trunk? What I mean is can I make that
port that interconnect's the 2 devices an access port with portfast
configured and than use a SVI interface on that router as the default
gateway? I have done this and it works without issues as far as I know
however just thinking about it now I am wondering why it doesn't cause any
problems. When you make a port an access port it usually is to connect end
devices like pc's etc however in this case the other device is also a switch
and that port on that device will also be an access port in a vlan. I tend
to think that it would send out BPDU's and if the other end has BPDUguard
configured than it would disable the port wouldn't it?
Does the device acting as a router still send out a BPDU on that port?
I would like to make the L2 switch the root of the spanning tree hence just
want to confirm if I have BPDU guard configured on that port will be a
problem.
When does a switch send out a BPDU? I mean I have read all about how when
there is a topology change or during root election etc but say for instance
in this scenario if I didn't have any spanning-tree on the 3550 being used
as a router would it still send out a BPDU?
Thx
This archive was generated by hypermail 2.1.4 : Sat Aug 18 2007 - 08:17:39 ART