Specifications

MX-2100/2104 Installation and Operation Manual Appendix C SNMP Management
IP Environment C-7
Subnet Addressing
When a large number of MX-2100 units are managed by an SNMP management
station, significant management traffic may be generated. Since large networks
generally have more than one management station, the management traffic load
becomes even higher. The usual approach to the management of a large network
is to split the network into management domains, where each management station
manages a predefined group of MX-2100 units. In this case, from the point of view
of system management, the network can be split into several subnetworks, as
shown in Figure C-2.
Management
Station
MBE/RAS/A
MBE/RAS/A
MBE/RAS/A
Network B
Network A
Network C
Management
Station
Management
Station
Figure C-2. Management System Topology Using Subnetting
For this purpose, the IP router function of MX-2100 SNMP agents supports
learning filters. A learning filter is defined by means of a subnet IP address, and a
subnet mask. The IP router will learn only addresses of agent IP addresses, which
when viewed through the mask, match the subnet IP address. Therefore, the IP
router can be instructed to learn only IP addresses of MX-2100 units within
predefined subnetworks. In the example, of Figure C-2, MX-2100 units in network
A need only learn the addresses of other units in the same network, and those of
units in network B; the same is true for the units in networks C and B.
Each pair of subnet IP address and subnet mask is called a net entry, and is
assigned a unique ID. The range of ID's is 1 through 255.