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29 Cards in this Set
- Front
- Back
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What is an EtherChannel?
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It allows up to 8 links to be bundled together. Must be Fast Ethernet up to 10 Gigabit Ethernet.
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What is the Port Aggregation Protocol (PAgP)?
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It is a Cisco-proprietary protocol that allows for automatic creation of EtherChannels between switches.
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What is the Link Aggregation Control Protocol (LACP)?
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It is a standards based protocol that allows for ports to be bundeled together.
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What are the three modes for PAgP?
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On
Auto Desirable |
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What are the three modes for LACP?
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On
Passive Active |
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How many links can LACP have configured for a bundle?
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16 (8 active & 8 backups)
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How does LACP decide what switch makes decisions?
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Lowest system priority
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How does LACP decide what ports to add to a bundle?
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Lowest port priority
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What PAgP/LACP modes ask to form a channel?
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Desirable/Active
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What PAgP/LACP modes wait to be asked to form a channel?
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Auto/Passive
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Does PAgP "Auto" mode negotiation send packets to initiate a channel?
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No
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Does LACP "Passive" mode negotiation send packets to initiate a channel?
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No
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Does PAgP "Desirable" mode negotiation send packets to initiate a channel?
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Yes
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Does LACP "Active" mode negotiation send packets to initiate a channel?
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Yes
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Does LACP and PAgP "On" mode negotiation send packets?
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No
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What is PAgP Silent submode?
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Allows ports to be added to an EtherChannel even if the other end of the link is silent and transmits no PAgP packets (useful for servers or other non-PAgP devices)
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When using LACP, what are the recommended modes for each switch to use?
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Active + Active
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What interface parameters does PAgP use to group interfaces?
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Speed
Duplex VLAN (range, trunk status, & native VLAN) |
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List the EtherChannel Load Balancing Methods.
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IP - src-dst-ip (default), src-ip, dst-ip
MAC - src-mac, dst-mac ,src-dst-mac Port - src-port, dst-port, src-dst-port |
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What interface command will configure load balancing?
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port-channel load-balance <method>
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What physical interfaces of an EhterChannel will DTP and CDP traffic travel on?
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DTP and CDP send and receive packets over ALL of the physical interfaces.
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What physical interfaces of an EhterChannel will STP traffic travel on?
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The first operational port in a bundle.
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What command must be run on an interface to allow it to join a Layer 3 port-channel?
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no switchport
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What IEEE spec is LACP?
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802.3ad
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How often are PAgP packets sent?
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30 seconds
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Will an EtherChannel form if one port is a SPAN port?
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No
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What interface command will configure the EtherChannel negotiation protocol?
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channel-protocol {pagp | lacp}
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What interface command will configure the EtherChannel interface?
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channel-group <number> mode {active | on |
{auto [non-silent]} | {desirable [non-silent]} | passive |
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What are the steps to configure an EtherChannel?
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1. Specify the interfaces
2. Configure the protocol 3. Create the port-channel interface 4. Configure the port-channel |
