GarrettCom Magnum 700X manual 2d External Packet Filtered

Magnum 700X Mini-Concentrators Installation and User Guide (05/98)

Should the table become full, the BPM will clear all entries in the table by reinitializing itself.

When an external packet’s source address is in the address table, it is purged. This can occur if a node has physically moved to a different location.

External packets are filtered when the destination is NOT IN the address table.

Figure 4.2d: External Packet Filtered

A summary of the filtering, forwarding, and address table maintenance performed by the BPMs is shown in Table 4.2.

	Table 4.2: BPM Functionality
Packet	Source	Destination	Address Table	Filter/Forward
Source	Address	Address	Maintenance	Action
Internal	Not in table	Not in table	Add source to table	Forward
Internal	Not in table	In table	Add source to table	Filter
Internal	In table	Not in table	Nothing	Forward
Internal	In table	In table	Nothing	Filter
External	Not in table	Not in table	Add source to table	Filter
External	Not in table	In table	Add source to table	Forward
External	In table	Not in table	Purge source from table	Filter
External	In table	In table	Purge source from table	Forward

2.Throughput Increase: By using a BPM to isolate a user group segment having significant local traffic, it is possible to increase overall network throughput. For example, a segment containing a group of workstations and servers may have heavy local traffic, but only a small amount of traffic that is directed outside the segment. A BPM connecting this segment to the rest of the network, as shown in Figure 4.2e, will keep the local segment traffic isolated from the rest of the network, thus increasing the effective bandwidth on both the local segment and the rest of the network.

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