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11-4
Port Trunking
Port Status and Configuration
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” on page 11-16.)
Trunk Configuration Methods
Dynamic LACP Trunk: The switch automatically negotiates trunked links
between LACP-configured ports on separate devices, and offers one dynamic
trunk option: LACP. To configure the switch to initiate a dynamic LACP trunk
with another device, use the interface ethernet command in the CLI to set the
default LACP option to Active on the ports you want to use for the trunk. For
example, the following command configures ports C1-C4 to LACP active:
ProCurve(config) int c1-c4 lacp active
Note that the above example works if the ports are not already operating in a
trunk. To change the LACP option on ports already operating as a trunk, you
must first disable the trunked ports that you want to reconfigure. For example,
if ports C1 - C4 were LACP-active and operating in a trunk with another device,
you would do the following to change them to LACP-passive:
1. Go to the port context for ports c1 - c4 and disable these ports.
ProCurve(config)# interface c1-c4
ProCurve(eth-c1-c4)#_
ProCurve(eth-c1-c4)# disable
2. Change all four ports to LACP-passive and re-enable the ports.
ProCurve(eth-c1-c4)# lacp passive
ProCurve(eth-c1-c4)# enable
Note If you change the port trunk configuration on a link, ensure that the port trunk
configuration on the other end of the link matches the new configuration.
Ensure that all ports in a dynamic trunk belong to the same port group. The
switches covered in this guide do not support trunks comprised of ports from
different port groups. (Refer to “Trunk Group Boundary Requirement” in table
11-3 on page 11-6.)