Port trunk features and operation
The switches covered in this guide offer these options for port trunking:
LACP: IEEE 802.3ad—Trunk group operation using LACP
Trunk: Non-Protocol—Trunk group operation using the "trunk" option
Up to 144 trunk groups are supported on the switches. The actual maximum depends on the number of ports available on the switch and the number of links in each trunk. (Using the link aggregation control protocol—LACP—option, you can include standby trunked ports in addition to the maximum of eight actively trunking ports.) The trunks do not have to be the same size; For example, 100 two-port trunks and 11 eight-port trunks are supported.
![[NOTE: ]](images/note.gif) | NOTE: LACP requires full-duplex (FDx) links of the
same media type (10/100Base-T, 100FX, and so on) and the same speed,
and enforces speed and duplex conformance across a trunk group. For
most installations, Hewlett Packard Enterprise Switch recommends that
you leave the port Mode settings at |
Fault tolerance
If a link in a port trunk fails, the switch redistributes traffic originally destined for that link to the remaining links in the trunk. The trunk remains operable as long as there is at least one link in operation. If a link is restored, that link is automatically included in the traffic distribution again. The LACP option also offers a standby link capability, which enables you to keep links in reserve for service if one or more of the original active links fails. (See Trunk group operation using LACP.)