Netgear XCM8806 Chassis User Manual - Page 129

NETGEAR 8800 User Manual The protocol then enables the aggregated link for traffic and monitors the status of the links for changes that may require reconfiguration. For example, if one of the links in a LAG goes down and there are standby links in that LAG, LACP automatically moves the standby port into selected mode and that port begins collecting and distributing traffic. The marker protocol portion of LACP ensures that all traffic on a link has been received in the order in which it was sent and is used when links must be dynamically moved between aggregation groups. The NETGEAR LACP implementation responds to marker frames but does not initiate these frames. Note: Always verify the LACP configuration by issuing the show ports sharing command; look for the ports specified as being in the aggregator. You can also display the aggregator count by issuing the show lacp lag command. You can configure additional parameters for the LACP protocol and the system sends certain SNMP traps in conjunction with LACP. The system sends a trap when a member port is added to or deleted from an aggregator. The system now detects and blocks loopbacks; that is, the system does not allow a pair of ports that are in the same LAG but are connected to one another by the same link to select the same aggregator. If a loopback condition exists between two ports, they cannot aggregate. Ports with the same MAC address and the same admin key cannot aggregate; ports with the same MAC address and a different admin key can belong to the same LAG. The system sends an error message if a LAG port is configured and up but still not attached to the aggregator or in operation within 60 seconds. Use the show lacp member-port detail command to display the churn on both sides of the link. If the Churn value is shown as True in the display, check your LACP configuration. The issue may be either on your end or on the partner link, but you should check your configuration. The display shows as True until the aggregator forms, when it changes to display as False. A LAG port moves to expired and then to the defaulted state when it fails to receive an LACPDU from its partner for a specified time. You can configure this timeout value as long, which is 90 seconds, or short, which is 3 seconds; the default is long. Use the show lacp lag detail command to display the timeout value for the LAG. There are two LACP activity modes: active and passive. In LACP active mode, the switch periodically sends LACPDUs; in passive mode, the switch sends LACPDUs only when it receives one from the other end of the link. The default is active mode. Use the show lacp lag detail command to display the LACP mode for the LAG. Note: One side of the link must be in active mode in order to pass traffic. If you configure your side in the passive mode, ensure that the partner link is in LACP active mode. Chapter 5. Configuring Slots and Ports on a Switch | 129