Siemens OSM Bedienungsanleitung Seite 25

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Important OSM/ESM Functions
2-5
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
2.5 Filtering Database (FDB Table)
The FDB (Filtering Database ) table is used by the OSM/ESM to decide which port
or ports a received packet is transferred to. The FDB table of the OSM/ESM can
hold up to 7000 addresses.
2.5.1 Entries in the FDB Table
The FDB table contains two types of entries (addresses):
S Static MAC addresses: These can be entered and deleted by the user with
WBM or SNMP.
S Learned MAC addresses: These are learned by the OSM/ESM automatically; in
other words they are entered in the FDB table when the module receives
corresponding packets. The OSM/ESM makes an entry in the FDB table
indicating the port at which it learned the address; in other words, the port to
which the node with the corresponding MAC address is connected. After
making this entry, it then passes all received packets for this node to the
relevant port. This mechanism reduces network load. Automatic learning is only
possible when lock disabled is set for the relevant OSM/ESM port, see
Section 2.6. This is the default setting.
Note
S The OSM TP22 and ESM TP40 do not support static entries in the FDB table.
S Static addresses are retained when the OSM/ESM is turned on and off or
restarted; learned addresses are deleted.
S In the redundant manager (RM) mode, no static address entries are possible.
S No static unicast addresses can be entered for the ring ports.
S If a port is used for a redundant network link (master and standby link), there
must be no static addresses entered for it.
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