9E312/9E423 Module Bridging
destination address is located on a different network, the bridge forwards the packet to the appropriate network. If the destination address is not found in the Filtering Database, the bridge forwards the packet to all networks. To keep Filtering Database entries current, older entries are purged after a period of time, which is called the Dynamic Ageing Time.
The Filtering Database consists of two separate databases: the Static and the Learned Databases.
The Static Database contains addresses that are entered by a network administrator. You add these addresses directly to the database while the bridge is powered up, or to the 9E312/9E423 Module’s
The Learned Database consists of addresses that accumulate as part of the bridge’s learning process as it is up and running. These do not remain in the Source Address Table when the system is shut down. The Learned Database also contains the addresses that are in the Static Database upon
Entries to the Source Address Table are one of four types: Permanent, Static, Dynamic, or Learned.
•Permanent entries are addresses that you add to the Static Database (via the Filtering Database window) that are stored in the 9E312/9E423 Module’s
•Static entries are addresses that you add to the Static Database (via the Filtering Database window). These entries remain in the 9E312/9E423 Module until it is shut down.
•Dynamic entries are addresses that you add to the Static Database (via the Filtering Database window). With the Ageing Time feature, you set the time period that these addresses are saved in the Source Address Table. Addresses that have not transmitted a packet during one complete cycle of the ageing timer are deleted from the database.
•Learned entries are addresses that are added to the Learned Database through the bridge’s learning process. With the Ageing Time feature, you set the time period that these addresses are saved in the Source Address Table. Addresses which are inactive within a cycle of the ageing timer are dropped from the database.
Learned address entries are divided into two types, Learned and Self. Address entries classified as Learned have transmitted frames destined for a device attached to a 9E312/9E423 Module port’s connected segment. Address entries classified as Self are those that have sent a frame with a destination address of one of the 9E312/9E423 Module’s bridging interfaces.
At the Filtering Database window (Figure
Filtering Database |
