switch learns the identity of partners capable of supporting PAgP and learns the capabilities of each interface. It then dynamically groups similarly configured interfaces into a single logical link (channel or aggregate port); these interfaces are grouped based on hardware, administrative, and port parameter constraints. For example, PAgP groups the interfaces with the same speed, duplex mode, native VLAN, VLAN range, and trunking status and type. After grouping the links into an EtherChannel, PAgP adds the group to the spanning tree as a single switch port.
This example shows configuration of a Layer 2 FEC:
Switch# configure terminal Switch(config)# interface port-channel 5 Switch(config-if)# no switchport Switch(config-if)# ip address 172.10.20.10 255.255.255.0 Switch(config)# interface range gigabitethernet0/4 -5 Switch(config-if-range)# no ip address Switch(config-if-range)# channel-group 5 mode desirable Switch(config-if-range)# end
Miscellaneous
Switch Optimization
By using Switch Database Management (SDM) templates, you can configure memory resources in the switch to optimize support for specific features, depending on how the switch is used in your network. You can select one of four templates to specify how system resources are allocated. You can then approximate the maximum number of unicast MAC addresses, Internet Group Management Protocol (IGMP) groups, quality of service (QoS) access control entries (ACEs), security ACEs, unicast routes, multicast routes, subnet VLANs (routed interfaces), and Layer 2 VLANs that can be configured on the switch. The four templates prioritize system memory to optimize support for these types of features:
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