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22 Cards in this Set

  • Front
  • Back

EtherChannel can be implemented by grouping multiple

physical ports into one or more logical EtherChannel links.

When an EtherChannel is configured, the resulting virtual interface is called a

port channel.

EtherChannel Advantages:

Configured all at once


Relies on existing switch ports.
Load Balancing.


Works with STP.

EtherChannel provides

redundancy.

If one link is lost no

STP calculations are necessary.

Can consist of up to

eight Ethernet ports.

EtherChannel creates a one-to-one relationship

one link connects only two devices.

All interfaces within an EtherChannel must have the same configuration of

speed and duplex


native and allowed VLANs on trunks


and access VLAN on access ports



EtherChannels can be formed through negotiation using one of two protocols

PAgP or LACP.

On Cisco devices, both protocols are

supported.

PAgP is a Cisco-proprietary protocol that aids in the automatic creation of

EtherChannel links.

PAgP packets are sent every

30 seconds.

PAgP checks for

configuration consistency.

PAgP manages link

additions and failures between two switches.

PAgP modes:

On


PAgP desirable


PAgP auto

PAgP modes must be

compatible on each side.

LACP is part of an

IEEE specification (802.3ad)

LACP allows several physical ports to be bundled to form a

a single logical channel.

LACP can be used to facilitate EtherChannels in

multivendor environments.

LACP modes:

On


LACP active


LACP passive

Configuration requirements:

EtherChannel Support.


Same speed and duplex.


VLAN's must match.


Range of VLAN's must match.

Individual port configuration prior to EtherChannel can result in

compatability issues.