Selecting How VLAN Membership is Implemented for Extended Ports

In Extended Edge Switching hardware, the extended ports are represented as virtual ports. The VLAN membership of extended ports can be implemented in two ways:

• Hash table with VLAN and virtual port as key. Hash tables can lead to hash collisions at higher scale. (Default)
• Virtual port group. Programming the same group number in the VLAN table and virtual port table indicates membership. The hardware has 64 virtual port groups. You should select this option if many VLANs share the same extended ports.

Note that changing this configuration at run time could result in temporary loss of traffic while the tables are reprogrammed. It is preferable to identify which option works best for the particular topology and leave the setting unchanged during run time or schedule the change during a maintenance window.