Extreme Networks ExtremeWare XOS 11.3, Manual

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Configuring Slots and Ports on a Switch
ExtremeWare XOS 11.3 Concepts Guide
120
Link Aggregation and Software-Controlled Redundant Ports—
Summit X450 Switch Only
If you are configuring software-controlled redundant ports and link aggregation together, the following
rules apply:
●
Only the master logical port can be a either a primary or redundant port.
●
You must unconfigure the software-controlled redundant ports prior to either configuring or
unconfiguring load sharing.
●
The entire LAG must go down before the software-controlled redundant port takes effect.
Dynamic versus Static Load Sharing
Beginning with 11.3, ExtremeWare XOS software supports two broad categories of load sharing, or link
aggregation:
●
Dynamic load sharing—Dynamic load sharing is a grouping of ports that use the Link Aggregation
Control Protocol (LACP) to dynamically determine if link aggregation is possible and then to
automatically configure the aggregation. LACP is part of the IEEE 802.3ad standard and allows the
switch to dynamically reconfigure the link aggregation groups (LAGs). The LAG is enabled only
when LACP detects that the remote device is also using LACP and is able to join the LAG.
●
Static load sharing—Static load sharing is a grouping of ports specifically configured to load share.
The switch ports at each end must be specifically configured as part of a load-sharing group.
NOTE
The platform-related load-sharing algorithms apply to LACP (as well as static load sharing).
Load-Sharing Algorithms
With ExtremeWare XOS version 11.2, you can use IPv6 addresses in the load-sharing algorithms.
Load-sharing, or link aggregation, algorithms allow you to select the distribution technique used by the
LAG to determine the output port selection. Algorithm selection is not intended for use in predictive
traffic engineering.
The ExtremeWare XOS software supports static load sharing, which is a grouping of ports specifically
configured to load share. Beginning with ExtremeWare XOS version 11.3, the software also supports
dynamic load sharing. (See
“LACP—Dynamic Link Aggregation” on page 122 for complete information
on LACP.) The switch ports at each end must be configured as part of a load-sharing group.
Additionally, you can choose the load-sharing algorithm used by the group.
The dynamic load-sharing feature, or Link Aggregation Control Protocol (LACP), is standards-based
and compatible with most third-party switches. Static load sharing is also compatible with most third-
party switches.
NOTE
Always reference the master logical port of the load-sharing group when configuring or viewing VLANs. VLANs
configured to use other ports in the LAG will have those ports deleted from the VLAN when link aggregation is
enabled.