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1.1.e - Etherchannel
Cisco-CCIE
18
Computer Networking
Professional
02/12/2017

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Cards

Term
what does an etherchannel do?
Definition
it aggregates the bandwidth of multiple physical links.
Term
what is the standard for LACP?
Definition
802.3ad.
Term
when configuring a L2 etherchannel, how can you quickly confirm that the member interfaces are being hidden from the other layers.
Definition
Check the STP topology, the port-channel interface should be referenced, not the members. This should also be the case for the MAC table.
Term
how can a single flow utilise 2Gbps of bandwidth when 2 x 1Gbps interfaces are bundled?
Definition
It can't. A single flow can't exceed the speed of an idividual link as it can't be load-balanced across multiple physical links.
Term
what is the main advantage of using the PAGP/LACP negotiation protocols?
Definition
They may prevent the risk of L2 loops associated with static port-channels.
Term
How will different load-balancing methods, at either end of a port-channel, affect the formation of the port-channel?
Definition
It won't. Load-balancing methods can be different at either end.
Term
command to set etherchannel misconfiguration guard to its default setting.
Definition
spanning-tree etherchannel guard misconfig

global command
Term
command to view interfaces that have been disabled by etherchannel misconfig guard.
Definition
show interfaces status err-disabled
Term
for what reasons will etherchannel misconfig guard place an interface in the errdisable state?
Definition
1. one end of a link is configured for etherchannel, the other is not.
2. the channel parameters are not matched on either end of the link.
Term
L3 etherchannel order of operations
Definition
1. create port-channel as L3
2. configure port-channel.
3. configure interfaces as L3.
4. add interfaces to channel-group.
Term
command to quickly view the status of all configured etherchannels
Definition
sh etherc summ
Term
command to view the protocols used to establish all etherchannels
Definition
sh etherc proto
Term
if one end of an etherchannel is up, the other end is guaranteed to be up when using what negotiation methods?
Definition
pagp and lacp
Term
interface command to prevent negotiation protocol misconfig
Definition
channel-protocol lacp | pagp
Term
command to confirm which internal vlan is being used for a L3 etherchannel
Definition
sh vl internal usage
Term
command to determine which switch controls the active port negotiation in a standard etherchannel. Also commands to verify.
Definition
lacp system-priority
show lacp
show lacp sys-id
Term
command to amend lacp settings, that will determine which ports will be active/standby on a switch.
Definition
lacp port-priority
Term
command to determine load-balancing methods of all etherchannels of a switch.
Definition
port-channel load-balance
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