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35 Cards in this Set
- Front
- Back
What IEEE Standard defines RSTP?
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802.1w
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What IEEE Standard defines MSTP?
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802.1s
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Name the port rolls for STP.
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Root Port
Designated Non Designated (Blocking) Disabled |
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Name STP Port states
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Blocking
Listening Learning Forwarding Disabled. |
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What is STP Port Cost for 100 meg link?
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19
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What is STP Port Cost for 1 gig link?
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4
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STP port cost for 10 gig link?
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2
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Name RSTP Port States
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Discarding
Learning Forwarding |
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Name RSTP Port Roles
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Root
Designated Alternate Backup |
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What state is a port put into once a BPDU is detected on a port which has bpdu filtering enabled?
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Err Disable
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What state will Loopguard put a port into.
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Loop inconsistent
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What state will root guard cause a port to go into?
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Blocking...
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True of False is fine to enable Loop guard on all ports in an architecture?
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True - "spanning-tree loop guard default"
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Name the two modes of UDLD
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Normal Mode
Aggressive Mode |
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UDLD -Normal Mode- causes what to happen with UDL is detected?
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Log the error
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UDLD Aggressive mode cause wha to happen when it detects a UDL ?
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Puts the switch port into Err Disable.
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Discuss 2 benefits that spanning-tree port-fast (or RSTP edge port type) provide.
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- Skip the forward delay to bring port active
- Topology change does not generate TCN BPDU |
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What happens once UplinkFast has switched to its alternate port.
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Floods multicast packets out alternate port to populate cam table.
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How much time is saved by using backbone fast?
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20 seconds - removes the need for a switch to wait max age time for a bpdu due to upstream topology transition.
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True or False - Edgeports / port-fast ports will always will never change their port type.
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False - Once BPDU is received on these ports the port will be move to a normal port.
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What port type in RSTP can make use of rapid / sync convergence?
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PTP-Designated ports
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In RSTP what happens when primary root port goes down.
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Alternate port is selected for use; if not switch declares itself root and begins synchronization.
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What is the RSTP synchronization?
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Feed back loop
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What does RSTP TCN tell switches to do?
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Immediately dump CAM table.
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STP Port Cost for 10 Meg link
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100
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How do you designate an "Edge Port" in RTSP
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utilize the spanning-tree portfast command on the interface.
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Difference between an Alternate and Backup port as defined in RTSP
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Alternate Port = different/alternate less desirable path to the root bridge. RECEIVES useful BPDU's from another bridge to keep its state.
Backup = different/backup path to a shared segment. The bridge receives useful BPDU's from itself! to stay in the discarding state. |
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How does RSTP detect legacy 802.1d switches
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By BPDU version.
RSTP uses version 2 STP uses version 1 |
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What defines a "Shared Port" in RSTP
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10 half duplex connections.
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Full duplex links are labeled as what in RSTP
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PTP Links
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What type BPDU's does the root bridge send out in 802.1d
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TC BPDU
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What is the default hello time in RSTP ?
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2 Seconds
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What causes RSTP to converge?
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3 missed BPDU's
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Explain RSTP proposal process
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Upsteam goes through feedback process with down stream switches. Once downstream agrees and provides feedback for root port. It moves allports to discarding and starts proposal downstream
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What standard defines CST (Common Spanning Tree)
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802.1q
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