Magnum 700X | Installation and User Guide (05/98) |
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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 |
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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.
GARRETT
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