Black Box LRU4240 - Manual (Page 94)

82 SALES: 0870 90 10 750 Dual Trunk E1 Router User’s Guide
Dual Trunk E1 Router
• SNMP Trap
• Lotus Notes
The Dual Trunk E1 Router uses the limited extensibility feature as defined in RFC 2021.
• The protocol directory can process up to 16 protocols
• Each protocol must be a “child protocol” of IP, UDP, or TCP
Using the limited extensibility feature, you can monitor any protocol that rides directly on top of IP,
UDP or TCP. You may define a particular value to be recognized in the demultiplexing field of the
parent protocol.
Protocol Distribution
The Protocol Distribution group allows the Dual Trunk E1 Router to discern how much traffic is
being used by a specific protocol. When viewing this data in Choice View, you will be able to
determine which protocols are the biggest users of the network’s bandwidth. This feature is referred
to as Application Top Talkers.
Network Layer and Application Layer Host Tables
RMON-2 allows you to discern which IP addresses are contributing the most traffic to your
network, and further, to drill down and find out which applications on these addresses are
generating the most activity. Identifying these Top Talkers gives you increased control over your
network and bandwidth usage.
The Network Layer Host Table (nlHostTable) provides information on the 256 busiest IP addresses,
while the Application Layer Host Table (alHostTable) lists how much traffic a particular IP address
is sending using a particular protocol. When an IP address has been identified as one of the Top
Talkers, periodically reading the alHostTable with Choice View, will reveal which application on
that IP address is using the most bandwidth.
The table has been implemented so that:
• There is one hlHostControlTable entry configured at boot time. Only one entry can exist at a
time. It can be set to monitor the entire E1 (default).
• The hlHostControlNIMaxDesiredEntries is set to 256. The Dual Trunk E1 Router builds a table
to monitor the activity of 256 IP addresses .
• The hlHostControlAIMaxDesiredEntries is set to 16. You can monitor 16 protocols at a time.
NOTE: Changes will be stored in volatile memory and not remembered after
the unit has been reset or powered off.
NOTE: If more than 256 IP addresses are detected on the network, the Dual
Trunk E1 Router replaces the least seen entry with the new entry in the
nlHostTable.