The first table listed in a RIB group configuration is the primary route table and determines the address family of the RIB group. This means that the primary route table is pivotal in defining the nature of the address family. A RIB group must contain one or more import-rib statements to specify the secondary route tables that will receive routes from the primary table. These import-rib statements are essential for the functioning of the RIB group as they define the routing tables that will be updated with the routes.
An EX Series switch retains a learned MAC address in the bridge table for 300 seconds by default. This period is known as the MAC address aging time. If no traffic from that MAC address is received within this time, the MAC address is removed from the bridge table. The default aging time can be modified if necessary.
When an EX Series switch receives a frame with a known destination MAC address, the switch consults its bridge table to find the matching MAC address. It then sends the frame out through the egress port associated with the destination MAC address within the ingress VLAN. This efficient forwarding method ensures that the frame reaches its intended recipient without unnecessary flooding to all ports.