ch.10 RSTP and EtherChannel Configuration

Question 1

What is a access switch

Answer 1

A switch used to connect to endpoint devices

Question 2

What is a distribution switch

Answer 2

switches that do not connect to endpoints but rather to each access switch

Question 3

How do you configure an EtherChannel

Answer 3

1. Add the channel-group [number] mode on, command in interface configuration mode under each physical interface that should be in the channel to add it to the channel
2. Use the same number for all commands on the same switch, but the channel-group number on the neighboring switch can differ

Question 4

What does the 802.3ad - Link Aggregation Control Protocol (LACP) do

Answer 4

negotiate so that only links that pass the configuration checks are actually used in an EtherChannel

Question 5

What is one difference between LACP versus PAgp

Answer 5

LACP does support more links in a channel -16 compared to PaGPs maximum of 8
LACP only 8 can be active at one time

Question 6

How do you fix a problem when a switch detects deifferent STP costs on ports in an EtherChannel and places them into a err-disabled state

Answer 6

Reconfigure the physical interfaces to use the same STP settings. Also the physical interfaces must be shutdown and then re-enabled using the no shutdown command

Question 7

spanning-tree mode (pvst | rapid-pvst | mst)

Answer 7

Globale config command to set the STP mode

Question 8

spanning-tree [vlan-number] root primary

Answer 8

Global config command that changes this switch to the root switch

Question 9

spanning-tree [vlan vlan-number] root secondary

Answer 9

Global config that sets this switches STP base priority to 28,672

Question 10

spanning-tree vlan vlan-id priority priority

Answer 10

Global config command that changes the bridge priority of this switch for the cpecified VLAN

Question 11

spanning-tree [vlan vlan number] cost cost

Answer 11

interface subcommand that changes the STP cost to the configured value

Question 12

spanning-tree [vlan vlan-number] port-priority priority

Answer 12

interface subcommand that changes the STP port priority in that VLAN (0 to 240, in increments of 16)

Question 13

channel-group channel-group-number mode (auto | desirable | active | passive | on)

Answer 13

Interface subcommand that enables EtherChannel on the interface

Question 14

show spanning-tree

Answer 14

Lists details about the state of STP on the switch. including the state of each port

Question 15

show spanning-tree valn valn-id

Answer 15

Lists STP info for the specified VLAN

Question 16

show etherchannel [channel-group-number] (brief | detail | port | port-channel | summary)

Answer 16

Lists info about the state of EtherChannel on this switch