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Flashcards in EtherChannel Deck (14)
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1
Q

What is EtherChannel?

A

Bonding of multiple physical interfaces as a single logical interface.

i.e. LAG - Link Aggregate Group or ‘Port Channel

2
Q
  1. Recomended oversubscription ratio from the access layer to the distribution layer
  2. Recomended oversubscription ratio from the distribution layer to the core layer
A
  1. 20:1
  2. 4:1
3
Q

In EtherChannel, what is a ‘flow’?

A

A traffic from a client to a server.

Can be setup to hash on:

  1. MAC address (Layer 2 [L2])
  2. IP address (Layer 3 [L3])
  3. port number (Layer 4 [L4])
4
Q

What are the 3 EtherChannel Protocols?

A
  1. LACP - Link Aggregation Control Protocol - Open Standard
  2. PAgP - Port Aggregation Protocol - Cisco proprietary
  3. Static EtherChannel - Manual config on each side of the link
5
Q

True or False?

Parameters on both sides of an EtherChannel link need to be setup the same?

A

True

  1. Speed
  2. Duplex
  3. Access or Trunk Mode
  4. Native VLAN on trunk ports
  5. Access VLAN on access ports
6
Q

Interface Active/Passive combinations in LACP (EtherChannel) endpoints (3):

A

Passive / Passive - No Link

Active / Passive - LAG link comes up

Active / Active - LAG link comes up - This is best

7
Q

Interface Desirable/Auto combinations in PAgP (EtherChannel) endpoints (3):

A

Auto / Auto - No Link

Desirable / Auto- LAG link comes up

Desirable / Desirable - LAG link comes up - This is best

8
Q

Interface ‘On’ in Static combinations (EtherChannel) endpoints.

A

On / On - LAG link comes up

9
Q

How do you configure EtherChannel on a device?

A

SW1(config)# interface range f0/1 - 4
SW1(config-if-range)# channel-group 1 mode active SW1(config-if-range)# channel-group 1 mode desirable SW1(config-if-range)# channel-group 1 mode on

SW1(config)# interface port-channel 1
SW1(config-if)# switchport trunk encapsulation dot1q
SW1(config-if)# switchport mode trunk

10
Q

Command to view EtherChannel info

A

SW1# show etherchannel summary

11
Q

Command to view Spanning Tree config as it relates to EtherChannel:

A

SW1# show spanning-tree vlan 1

12
Q

What is StackWise as it relates to EtherChannel?

A

A form of Multi-Chassis EtherChannel.

Requires a high end multi-switch stack on one end of the link.
Supports full load balancing and redundancy.
Supported on some Catalyst switches.

13
Q

What is VSS as it relates to EtherChannel?

A

Virtual Switching System which is supported on some Catalyst switches.
A form of Multi-Chassis EtherChannel.

14
Q

What is vPC as it relates to EtherChannel?

A

Virtual Port Channel on Nexus switch family switches.
Switches are not part of a traditional “stack”, they are just seperate switches that talk to each other.