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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. |
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When an EtherChannel is configured, the resulting virtual interface is called a |
port channel. |
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EtherChannel Advantages: |
Configured all at once Relies on existing switch ports. Works with STP. |
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EtherChannel provides |
redundancy. |
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If one link is lost no |
STP calculations are necessary. |
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Can consist of up to |
eight Ethernet ports. |
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EtherChannel creates a one-to-one relationship |
one link connects only two devices. |
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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 |
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EtherChannels can be formed through negotiation using one of two protocols |
PAgP or LACP. |
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On Cisco devices, both protocols are |
supported. |
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PAgP is a Cisco-proprietary protocol that aids in the automatic creation of |
EtherChannel links. |
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PAgP packets are sent every |
30 seconds. |
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PAgP checks for |
configuration consistency. |
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PAgP manages link |
additions and failures between two switches. |
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PAgP modes: |
On PAgP desirable PAgP auto |
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PAgP modes must be |
compatible on each side. |
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LACP is part of an |
IEEE specification (802.3ad) |
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LACP allows several physical ports to be bundled to form a |
a single logical channel. |
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LACP can be used to facilitate EtherChannels in |
multivendor environments. |
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LACP modes: |
On LACP active LACP passive |
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Configuration requirements: |
EtherChannel Support. Same speed and duplex. VLAN's must match. Range of VLAN's must match. |
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Individual port configuration prior to EtherChannel can result in |
compatability issues. |