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Day 23 EtherChannel.md

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Topics we'll cover

  • What is EtherChannel? What problems does it solve?
  • Configuring Layer 2/ Layer 3 EtherChannels

Load Balancing

Etherchannel Load-balancing verification and Configuration

show etherchannel load-balance -> to view the current load balancing method

port-channel load-balance src-dst-mac -> to change the load balancing method

other load balancing method

Creating etherchannel between two switches

There are three methods of EtherChannel configuration on cisco switches:

  • PAgP (Port Aggregation Protocol)

    • Cisco Proprietary Protocol
    • Dynamic Negotiates the creation/maintenance of the EtherChannel.

  • LACP (Link Aggregation Control Protocol)

    • Industry standard protocol (IEEE 802.3ad)
    • Dynamic Negotiates the creation/maintenance of the EtherChannel.

  • Static EtherChannel

    • A protocol isn't used to determine if an EtherChannel should be formed
    • Interfaces are statically configured to form an EtherChannel

Note: Up to 8 interfaces can be fromed into a single EtherChannel (LACP allows up to 16, but only 8 will be active, the other 8 will be in standby mode, waiting for an active interface to fail

Configuration

  • PAgP

  • LACP

  • Static Ether Channel Configuration

Note

  • Member interfaces must have matching configurations.

    • same duplex (full/half)
    • same speed
    • same switchport mode (access/trunk)
    • same allowed vlans/native vlan (for trunk interfaces)

  • If an interface's configurations do not match the others, it will be excluded from the EtherChannel

show etherchannel summary

`` show etherchannel summary

Layer 3 EtherChannel

Commands