Extreme Networks: LACP mit Extremeware 7.8

enable sharing grouping

For “i” series switches ????

enable sharing <port> grouping <portlist> {dynamic | algorithm {port-based address-based | round-robin}}


Wichtigste Aussage: Dieser Befehl ermöglicht statisches oder dynamisches Load Sharing.

  • Bei der Verwendung des dynamischen sharings wird LACP genutzt. (Dies ist – für XOS Anwender XOS etwas unklar, da keine Auswahl getroffen werden kann, ob LACP genutzt werden soll oder nicht.
  • Das LACP ist aber aktiv.
  • LACP wird genutzt, sobald die andere (XOS) Seite auch LACP verwenden will.

Das hat Konsequenzen auf die Syntax bei der Einrichtung des Sharings, wenn man ein Extremeware und ein XOS Switch per LACP(MLAG) verbinden möchte:

# Auf der Seite des Extremeware Switches muss es also heißen:

enable sharing 49 grouping 49-50 dynamic
# Auf der Seite des XOS Switches muss es heißen:

enable sharing 49 grouping 49-50 algorithm address-based L2 lacp

This command enables the switch to configure static port load sharing or dynamic port load sharing. When configuring dynamic port load sharing, LACP will be used to detect and set up for the remote side’s load sharing capabilities.

Dynamic load sharing—A grouping of ports that use IEEE 802.3ad load sharing to dynamically determine if load sharing is possible, and automatically configure load sharing when possible. Uses Link Aggregation Control Protocol (LACP), part of the IEEE 802.3ad standard, to allow the switch to dynamically reconfigure the sharing groups. The group is only enabled when LACP detects that the other side is also using LACP, and wants these ports to be in a group. Dynamic load-sharing is not supported in a stacked switch configuration.

Load sharing allows you to increase bandwidth and availability between switches by using a group of ports to carry traffic in parallel between switches. The sharing algorithm allows the switch to use multiple ports as a single logical port or a “master” port. For example, VLANs see the load-sharing group as a single logical port. The algorithm also guarantees packet sequencing between clients. If a port in a load-sharing group fails, traffic is redistributed to the remaining ports in the load-sharing group. If the failed port becomes active again, traffic is redistributed to include that port.
Load sharing must be enabled on both ends of the link, or a network loop will result.
While LACP is based on industry standard, this feature is supported between Extreme Networks
switches only. However, it may be compatible with third-party “trunking” or sharing algorithms. Check with an Extreme Networks technical representative for more information.
Modular switch load-sharing groups are defined according to the following rules: