15 Responses

  1. Andy Daniel
    Andy Daniel at |

    Great article and I agree, especially in regards to hashing. LACP has absolutely no benefit in regards to hashing. There are some great past articles discussing hashing that are linked in one that I wrote a while back at http://www.vnephos.com/index.php/2010/07/nx-os-port-channel-hashing/. However, in regards to LACP and its benefits, I will caution against using static etherchannel with any form of Cisco vPC upstream. This can cause major issues because the upstream switch will bring the physical ports up before vPC is actually “consistent” and the host will send out both with inconsistent results. This is where LACP on the host (Nexus 1000v) brings a little help to the table by identifying the fact that the LACP system ID upstream is different between the two links. To me, LACP is like insurance, and I typically carry insurance on things that are important to me. :)

    Reply
  2. Jason
    Jason at |

    Great article! Would a good use case for LACP be IP Storage (NFS/iSCSI)?

    Thanks,

    Jason

    Reply
  3. Ramses Smeyers
    Ramses Smeyers at |

    Excellent read, perfect explanation and makes total sense ;)

    Reply
  4. Lars Troen (@larstr)
    Lars Troen (@larstr) at |

    Nexus 1000v is not the only way to use LACP anymore. Also the new IBM 5000v switch supports LACP: http://www-01.ibm.com/support/docview.wss?uid=isg3T7000509&aid=1

    Reply
  5. New 5.1 Distributed Switch Features Part 4 – LACP, SR-IOV, Elastic Ports, and More « Wahl Network

    [...] that’s over with now that the new vDS 5.1 supports LACP (mode active) port channels! I’ve written on LACP before, and the current process was to use a Nexus 1000v if LACP was required, because the vSphere side of [...]

  6. LACP and ESXi 5.1 | Rickard Nobel
    LACP and ESXi 5.1 | Rickard Nobel at |

    [...] With the command “Show Lacp” we could see that the physical switch has successfully found LACP partners on both interfaces and that the link is now up and running in good order. This is the great feature of LACP, meaning that links will not get up in running order if the other side is not a LACP partner. This prevents lots of potential network disturbances and makes it much more easy to verify link aggregation configuration. It should be noted that LACP, despite popular belief, does not make the network load distribution any different or more optimized. Chris Wahl has a good writeup demystifying many LACP myths here. [...]

  7. LACP and ESXi 5.1 | Nicola Marco Decandia

    [...] With the command “show lacp” we could see that the physical switch has successfully found LACP partners on both interfaces and that the link is now up and running in good order. This is the great feature of LACP, meaning that links will not get up in running order if the other side is not a LACP partner.This prevents lots of potential network disturbances and makes it much more easy to verify link aggregation configuration. It should be noted that LACP, despite popular belief, does not make the network load distribution any different or more optimized. Chris Wahl has a good writeup demystifying many LACP myths here. [...]

  8. Pgt
    Pgt at |

    Simple and clear explanation. I’ve read a thousand blogs but this is CLEAR.

    btw for anyone wondering what happened to 802.3ad, it has been moved to IEEE 802.1AX

    Reply
  9. Link Aggregation | The Data Center Overlords

    […] What about LACP? LACP is part of the 802.1AX standard, but it is neither the entirety of the 802.1AX standard, nor is it required in order to stand up a LAG.  LACP is also not link aggregation. It is a protocol to build LAGs automatically, versus static. You can usually build an 802.1AX LAG without using LACP. Many devices support static and dynamic LAGs. VMware ESXi 5.0 only supported static LAGs, while ESXi 5.1 introduced LACP as a method as well. […]

  10. Question On LACP
    Question On LACP at |

    […] support LACP, like a server NIC (notably vSphere, i heard the latest release added LACP support) Demystifying LACP vs Static EtherChannel for vSphere Quote […]

  11. GOOD ARTICLES TO UNDERSTAND LACP & STATIC ETHERCHANNEL | RJ Approves This Message!
  12. Tim Erwine
    Tim Erwine at |
    Reply

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