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BP.
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God is one of multiple security mechanisms available in spanning tree.
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To protect your spending tree network.
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This could be something as simple as a user connecting a cheap consumers switch to your network that
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doesn't support spending tree and hence causing a loop or something malicious such as an attacker plugging
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in a switch and making that switch the root of the spanning tree so that the attacker can analyze your
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network traffic that traverses that switch or it could be an attacker simply connecting a switch to
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your topology lowering the priority and degrading the performance of your network considerably by forcing
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the network traffic to go through a low performance switch.
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So one of the options you have to stop this is BP to you God which will disable a port if any BP to
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use all received on that port.
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This is useful on ports that are going to be used as access ports and that should never be connected
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to another switch.
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In other words ports that are going to be configured as Port Foss ports they are two ways to configure
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BP to you God.
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You can either do it on a per interface basis or configure it globally on a switch on a per port basis
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you would type spending three port first and then spanning tree BP to you.
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God enable or globally on the switch you can use the command spanning tree port Foster default so in
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this topology let's assume that this hub shouldn't be connected to the network and will enable BP God
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on switch 2 and switch 3 because we shouldn't be receiving BP to use on any of these ports.
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These ports should be connected to user pieces rather than a hub
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so committee spending 3 port fast edge PPD you
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got we have globally enabled PPD you God on switch to at the moment port gigabit 0 1 is not enabled
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for Port Fost and we can see that by using the command tro spanning tree interface interface gigabit
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0 1 port fast so it's disabled but known gigabit 0 1 lets type spending 23 port fast
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notice very quickly BP you God warns us that if BP to you is received on this port and the port has
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been disabled so BP to you God.
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Error detected on this port Port is placed in the error disabled state port has gone down so show interface
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gigabit 0 1 interfaces down line protocol is down because the port was error disabled shows spending
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23 notice the port is not shown in the output here if we look at gigabit 0 1 port fast we can see that
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no spending tree information is available in this port because the port has been error disabled shows
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spanning tree inconsistent ports
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show spanning tree summary we can see that the switch is using rapid PBS tea and we can see that port
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Frost edge.
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BPT you guard default has enabled so I'll shut that port down and then no shut it and let's see what
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happens again so no shut it and notice immediately.
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The port is error disabled so do show run interface gigabit.
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0 1.
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We need to remove this port Fost command so no spanning tree.
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Port fast
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and do show run interface gigabit 0 1 We've now removed port fast so shut the port down.
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And no shut it notice the port has come up shows banning tree blocked ports gigabit 0 1 is now being
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blocked because that port is an alternate port on this segment the designated port is gigabit 0 1 on
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switch 3 and we can see that by tapping shows spanning tree.
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Notice gigabit 0 1 is the designated port on the segment.
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This is a hub.
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Please note.
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So this is the designated port for this segment.
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This port gigabit 0 1 is blocking on switch to so these ports should have been connected to pieces.
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But if a user connected a hub or someone tried to do something malicious BBDO guard blocks the ports
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immediately.
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Now we can configure this on a per port basis so let's do that on gigabit 0 2 spanning tree people to
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you PPD God in April
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noticed immediately a PPD was received on the Port.
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Port goes to the disable mode so if you enable it on an interface the port doesn't even need to be configured
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as a port first port.
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When a BP to use received on the port it immediately error disables so do show interface gigabit 0 2
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notice the port is down it's error disabled.
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