Mac Address Table Management; Mac Address Table Management Configuration Task List - 3Com 5500-EI PWR Install Manual

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The MAC address aging timer only takes effect on dynamic MAC address entries.

With the "destination MAC address triggered update function" enabled, when a switch finds a

packet with a destination address matching one MAC address entry within the aging time, it

updates the entry and restarts the aging timer.

Entries in a MAC address table

Entries in a MAC address table fall into the following categories according to their characteristics and

configuration methods:

Static MAC address entry: Also known as permanent MAC address entry. This type of MAC

address entries are added/removed manually by the network operator and cannot age out by

themselves. Using static MAC address entries can greatly reduce broadcast packets and are

suitable for networks where network devices seldom change.

Dynamic MAC address entry: This type of MAC address entries age out after the configured aging

time. They are generated by the MAC address learning mechanism or configured manually.

Blackhole MAC address entry: This type of MAC address entries are configured manually. A switch

discards the packets destined for or originated from the MAC addresses contained in blackhole

MAC address entries. Blackhole entries are configured for filtering out frames with specific source

or destination MAC addresses.

lists the different types of MAC address entries and their characteristics.

Table 1-1 Characteristics of different types of MAC address entries

address entry

address entry

Blackhole MAC

address entry