Layer 2 Switching Commands 619unable to buffer the requisite number of frames will show excessive framediscard. Configuring copper and fiber ports together in an aggregation groupis not recommended.If a dynamic LAG member sees an LACPDU that contains informationdifferent from the currently configured default partner values, that particularmember drops out of the LAG. This configured member does not aggregatewith the LAG until all the other active members see the new information.When each of the other active members sees the new information, theycontinue to drop out of the LAG. When all the members have dropped out ofthe LAG, they form an aggregate with the new information.Static LAGSA static LAG is fundamentally no different from a dynamically configuredLAG. All the requirements for the member ports hold true (member portsmust have same duplex settings, same speed, and so on). The only differenceis this LAG has an additional parameter static which makes this LAG notrequire a partner system running Link Aggregation Control Protocol (LACP)to be able to aggregate it's member ports.Care must be taken while enabling this type of configuration. If the PartnerSystem is not 802.3AD compliant or the Link Aggregation Control protocol isnot enabled, there may be network instability. Network instability occurswhen one side assumes that the members in an aggregation are one singlelink, while the other side is oblivious to this aggregation and continues totreat the 'members' as individual links.A static LAG does not transmit or process received LACPDUs, that is, themember ports do not transmit LACPDUs and all the LACPDUs it receivesare dropped. A dropped counter is maintained to count the number of suchPDUs.Configured members are added to the LAG (active participation)immediately if the LAG is configured to be static. There is no wait timebefore we add the port to the LAG.A LAG can be either static or dynamic, but not both. It cannot have somemember ports participate in the protocol while other member ports do notparticipate. Additionally, it is not possible to change a LAG from static todynamic via the CLI. You must remove the member ports from the staticLAG and then add them to the dynamic LAG.
