Etherchannel in Cisco Switches & Routers, Link Aggregation & PAgP LACP

1. Etherchannel in Cisco Switches &
Routers,
Link Aggregation & PAgP LACP

2.  EtherChannel is a port link aggregation technology developed
by Cisco, which provides fault-tolerant high-speed links
between Switches, Routers, and Servers.
 EtherChannel technology allows multiple physical Ethernet
links (Fast Ethernet or Gigabit Ethernet) to combine into one
logical channel.
 EtherChannel technology allows grouping of several physical
Ethernet links (Fast Ethernet, Gigabit Ethernet, or 10 Gigabit
Ethernet) to create one logical Ethernet link for the purpose of
providing fault-tolerance and high-speed links between
switches, routers and servers.

3.  EtherChannel technology can be used to increase the
bandwidth between two devices that support EtherChannel
technology and EtherChannel technology provides automatic
recovery for the loss of a link by redistributing the load across
the remaining links.
 EtherChannel technology allows automatic redirection of
network traffic from the failed link to the remaining links in
EtherChannel.
 An EtherChannel consists of individual Fast Ethernet or
Gigabit Ethernet or 10-Gigabit links bundled into a single
logical link.
 The EtherChannel provides full-duplex bandwidth up to 800
Mbps (Fast EtherChannel FEC) or 8 Gbps (Gigabit
EtherChannel) or 10 Gbps (10-Gigabit Etherchannel 10 GEC)
between Switches, Routers and Servers.

4.  The main advantages of EtherChannel technology is that it
allows load sharing of traffic among the links in the channel as
well as redundancy in the event that one or more links in the
EtherChannel fail.
 EtherChannel is a Cisco Copyrighted term and the term which
industry adopted is "Link Aggregation".

5.  There are two protocols used for negotiating EtherChannel
and Link Aggregation. We can configure Etherchannel in three
ways in Cisco Switches.
1. Port Aggregation Protocol (PAgP) - Cisco Proprietary
protocol
2. IEEE Link Aggregation Protocol (LACP) - Industry
Standard
3. Manual Etherchannel Configuration - Without using any
negotiation protocol listed above
 The Port Aggregation Protocol (PAgP) and Link Aggregation
Control Protocol (LACP) can be used for EtherChannel
negotiation. Port Aggregation Protocol (PAgP) is a Cisco
proprietary protocol. Therefore PAgP can be used to negotiate
EtherChannels only between Cisco switches.

6.  Link Aggregation Control Protocol (LACP) is an industry
standard defined in IEEE 802.3AD. Using Link Aggregation
Control Protocol (LACP), Cisco switches can negotiate Link
Aggregation with switches from different vendors that support
802.3AD protocol.
 Port Aggregation Protocol (PAgP) or Link Aggregation Control
Protocol (LACP) is used by a Switch to learn the identity of
partners, capability of partners and the interface properties
and capabilities. Port Aggregation Protocol (PAgP) or Link
Aggregation Control Protocol (LACP) groups similarly
configured interfaces into a single logical link present the
group to Spanning Tree Protocol (STP) as a single switch port.

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