Day 21 | STP (part two)
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41 Terms
What are the two 'stable' STP port states?
Blocking, Forwarding
What are the two 'transitional' STP port states?
Listening, Learning
STP: Non-designated ports are in a […] state.
Blocking
STP: Do interfaces in a blocking state send/receive regular network traffic?
No
STP: Do interfaces in a blocking state send BPDUs?
No
STP: Do interfaces in a blocking state receive BPDUs?
Yes
STP: Do interfaces in a blocking state learn MAC addresses?
No
STP default Forward delay timer:
15 seconds
STP: Do interfaces in a Listening state send/receive regular network traffic?
No
STP: Do interfaces in a Listening state send/receive BPDUs?
Yes
STP: Do interfaces in a Listening state learn MAC addresses?
No
STP: Do interfaces in a Learning state send/receive regular network traffic?
No
STP: Do interfaces in a Learning state send/receive BPDUs?
Yes
STP: Do interfaces in a Learning state learn MAC addresses?
Yes
STP: Do interfaces in a Forwarding state send/receive regular network traffic?
Yes
STP: Do interfaces in a Forwarding state send/receive BPDUs?
Yes
STP: Do interfaces in a Forwarding state learn MAC addresses?
Yes
STP default hello timer:
2 seconds
STP default max age timer:
20 seconds (10*hello timer)
STP BPDUs are only forwarded on […] ports.
designated
STP: A forwarding interface [can/can't] move directly to a blocking state.
can
STP: A blocking interface [can/can't] move directly to a forwarding state.
can't
PVST+ BPDUs are sent to destination MAC address:
0100.0ccc.cccd
Standard STP (NOT PVST) BPDUs are sent to destination MAC address:
0180.c200.0000
The STP timers on the […] determine the timers used for all switches in the network.
root bridge
[…] allows an STP port to move immediately to the forwarding state.
Portfast
If an interface with […] enabled receives a BPDU from another switch, the interface will be shut down.
BPDU Guard
"Enable portfast on a switch port:
"Enable portfast on all access ports on the switch:
"
All access ports
"Enable BPDU Guard on a switch port:
"Enable BPDU Guard on all Portfast-enabled interfaces:
Which STP optional feature prevents a newly connected switch from becoming the root bridge?
Root Guard
Which STP optional feature shuts down an interface if it stops receiving BPDUs?
Loop Guard
"Configure spanning tree in PVST mode:
"Configure the spanning-tree root for a VLAN:
24576
"Configure the spanning-tree secondary root for a VLAN:
28672
"Configure the STP cost of an interface:
"spanning-tree vlan vlan-id cost cost"
"Configure the STP priority of an interface:
SW1(config-if)# […]
"