55Specifying ignored VLANs on a Layer 2 aggregate interfaceBy default, to become Selected ports, the member ports must have the same VLAN permit state andVLAN tagging mode as the corresponding Layer 2 aggregate interface.The system ignores the permit state and tagging mode of an ignored VLAN when choosing Selectedports.To configure ignored VLANs on a Layer 2 aggregate interface:Step Command Remarks1. Enter system view. system-view N/A2. Enter Layer 2 aggregateinterface view.interface bridge-aggregationinterface-number N/A3. Configure ignored VLANs. link-aggregation ignore vlanvlan-id-listBy default, a Layer 2 aggregateinterface does not ignore anyVLANs.Configuring the MTU of a Layer 3 aggregate interfaceMaximum transmission unit (MTU) of an interface affects IP packets fragmentation and reassembly on theinterface.To change the MTU of a Layer 3 aggregate interface:Step Command Remarks1. Enter system view. system-view N/A2. Enter Layer 3 aggregateinterface or subinterface view.interface route-aggregation{ interface-number |interface-number.subnumber }N/A3. Configure the MTU of theLayer 3 aggregate interfaceor subinterface.mtu size The default setting is 1500 bytes.Setting the minimum and maximum numbers of Selected portsfor an aggregation groupIMPORTANT:The minimum and maximum number of Selected ports must be the same for the local and peeraggregation groups.The bandwidth of an aggregate link increases as the number of Selected member ports increases. Toavoid congestion, you can set the minimum number of Selected ports required for bringing up anaggregate interface.This minimum threshold setting affects the aggregation state of both aggregation member ports and theaggregate interface:
