CCNA Day 22 - Rapid STP
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22 Terms
IEEE 802.1w
What IEEE is Rapid STP defined in?
IEEE 802.1s
What IEEE is Multiple STP defined in?
PVST+
What is Cisco’s upgrade to 802.1d?
Rapid PVST+
What is Cisco’s upgrade to 802.1w?
Discarding, Learning, Forwarding
What are the three RSTP port states?
Root, Designated, Alternate, Backup
What are the four RSTP port roles?
UplinkFast, BackboneFast, PortFast
Which STP optional features were built in to RSTP to allow ports to move directly to a forwarding state in certain circumstances?
RSTP Alternate Port Role
RSTP Port role that is a discarding port that receives a superior BPDU from another switch. It functions as a backup to the root port.
RSTP Backup Port Role
RSTP Port role that is a discarding port that receives a superior BPDU from the same switch. It functions as a backup to a designated port.
spanning-tree mode rapid-pvst
Enable rapid PVST mode on the switch:
SW1(config)#[…]
All switches
In RSTP which switch(es) originate BPDUs?
Yes, the interface connected to the switch running classic STP will run in classic STP mode.
Is RSTP compatible with classic STP?
2 (0x02)
What is the protocol version identifier in a rapid STP BPDU?
0 (0x00)
What is the protocol version identifier in a classic STP BDPU?
3
How many BPDUs can a neighboring switch miss before an RSTP switch considers that neighbor lost?
Edge, Point-to-point, Shared
What are the three RSTP link types?
spanning-tree portfast
Configure a switchport as an RSTP edge port:
SW1(config-if)#[…]
spanning-tree link-type point-to-point
Configure a switchport as an RSTP point-to-point port:
SW1(config-if)#[…]
spanning-tree link-type shared
Configure a switchport as an RSTP shared port:
SW1(config-if)#[…]
Point-to-point
What RSTP link type is used for full-duplex connections?
Shared
What RSTP link type is used for half-duplex connections?
RSTP port cost is calculated by dividing 20,000,000 by the port speed in MB. Ex: 10Mbps=2million cost, 10Gbps=2000 cost.
How is the RSTP port cost calculated? Give examples of common port speeds and their costs.