Day 24 - EtherChannel Flashcards
This allows you to bundle multiple physical interfaces into one logical channel to increase the bandwidth on point-to-point links
EtherChannel
How many equal speed links can you configure EtherChannel for between two switches?
8
STP sees the bundle of physical EtherChannel’d links as what?
Single interface
As a result of EtherChannel, if one of the links goes down in the port channel, what doesn’t have to occur in regards to STP?
Convergence
When EtherChannel is configured, the resulting virtual interface is called a what?
Port channel
What are some of the benefits of EtherChannel?
Configuration can be done on EC interface instead of individual links
Increases bandwidth
Load balancing
STP recognizes as one logical link
Redundancy
True or False: EtherChannel links can mix FastEthernet and GigabitEthernet interfaces
False
All ports must be Layer __ ports when enabling EtherChannel
2
What modes does PAgP use?
On
Desirable
Auto
Solve for definition:
This mode forces the interface to channel without PAgP
On
Solve for definition:
The interface initiates negotiations with other interfaces by sending PAgP packets
Desirable
Solve for definition:
The interface responds to the PAgP packets that it receives but does not initiate PAgP negotiation
Auto
With PAgP mode settings, will the below mode(s) allow a channel to be established?
On / On
Yes
With PAgP mode settings, will the below mode(s) allow a channel to be established?
Auto/Desirable / Desirable
Yes
With PAgP mode settings, will the below mode(s) allow a channel to be established?
On/Auto/Desirable / Not configured
No
With PAgP mode settings, will the below mode(s) allow a channel to be established?
On / Desirable
No
With PAgP mode settings, will the below mode(s) allow a channel to be established?
Auto / Desirable
Yes
Link aggregation control protocol is what IEEE standard?
802.3ad
Solve for definition:
This mode forces the interface to channel without LACP
On
Solve for definition:
The interface initiates negotiations with other interfaces by sending LACP packets
Active
Solve for definition:
The interface responds to the LACP packets that it receives but does not initiate LACP negotiation
Passive
With LACP mode settings, will the below mode(s) allow a channel to be established?
On / On
Yes
With LACP mode settings, will the below mode(s) allow a channel to be established?
Active/Passive / Active
Yes
With LACP mode settings, will the below mode(s) allow a channel to be established?
On/Active/Passive / Not configured
No
With LACP mode settings, will the below mode(s) allow a channel to be established?
On / Active
No
With LACP mode settings, will the below mode(s) allow a channel to be established?
Passive/On / Passive
No
What commands would be used to configure an EtherChannel interface between interfaces Gi0/1 and Gi0/2
int range gi0/1 - 2
channel-group 1 mode on (or active, desirable, etc)
int port-channel 1
sw mode trunk
sw trunk native vlan {vlan}
sw trunk allowed vlan {allowed-vlans}
What command would you use to verify EtherChannel?
show etherchannel summary
When verifying EtherChannel, what does (SU) stand for?
Layer 2 and In Use
When verifying EtherChannel, what does (P) stand for?
Bundled in port channel
What command would you use to verify Etherchannel on a specific port?
show int {int} switchport
Ports with different native VLANs cannot form an ____________
EtherChannel
If the allowed range of __________ is not the same, the ports do not form an __________, even when PAgP is set to auto or desirable
VLANs
EtherChannel
True or False: Packets from the same flow are load balanced round robin style across all the interfaces in the port channel (EtherChannel)?
False. Flows go over a single port channel interface
What is a flow in regards to EtherChannel?
A flow is a communication from a client to a server using a particular application
A single flow is __________ onto a single port channel interface
Load balanced
What do LACP and PAgP have in common?
Both sides of the link negotiate the port channel creation and maintenance
What is unique to Static EtherChannel that other two protocols don’t have?
The switches do not negotiate the creation and maintenance BUT the settings on both sides still must match for the Port Channel to come up
What identical parameters must be in place to have the EtherChannel port come up?
Speed and Duplex
Access or Trunk Mode
Native VLAN and allowed VLANs on Trunks
Same Access VLAN on access ports
What two (or even three) modes can LACP interfaces be set to?
On
Active
Passive
With LACP, if SW1s interface is set to Active and SW2s interface is set to Passive, will the port channel come up?
Yes
With LACP, if SW1s interface is set to Passive and SW2s interface is set to Passive, will the port channel come up?
No
With LACP, if SW1s interface is set to Active and SW2s interface is set to Active, will the port channel come up?
Yes
With PAgP, what mode(s) must both interfaces be set to for the EtherChannel to come up?
Desirable / Auto
OR
Desirable / Desirable
With PAgP, what mode is the most preferrable?
Desirable
What mode would Active or Passive be apart of?
LACP
What Etherchannel mode would Auto or Desirable be apart of?
PAgP
What mode would On be apart of?
Static
