Appendix C SNMP Management
MX-2100/2104
Installation and Operation Manual
C-6
IP Environment
In the address range:
numbers - indicate bytes that are part of the network portion
H - indicates bytes that are part of the host portion.
•
Host Portion. The host portion is used to identify an individual host connected
to the network. The host identifier is assigned by the using organization, in
accordance with its specific needs.
The all-zero host identifier is always interpreted as a network identifier, and must
not be assigned to an actual host.
•
Often, the host portion is further sub-divided into two portions:
Subnet Number - For example, subnet numbers can be used to identify
departmental subnetworks. The subnet number follows the network
identifier.
Host Number - the last bits of the IP address.
Net and Subnet Masks
Net and subnet masks are used to help filter the relevant traffic more efficiently:
the function of the net and subnet mask is to specify how many of the IP address
bits are actually used for the net identifier and for the subnet number.
The mask is a 32-bit word that includes “
ones
” in the positions used for net and
subnet identifications, followed by “
zeros
” up to the end of the IP address.
For example, the subnet mask corresponding to the Class C IP address
194.227.31.67 is 255.255.255.000.
Recommendations for the Selection of IP Addresses
When the MX-2100 SNMP agent and its management station are connected to the
same network, the network identifier part of the IP address assigned to the SNMP
agent must be identical to the network identifier part of the IP address of the
management station.
However, the agent and the MX-2100 SNMP management station can also be on
different IP networks. In this case, each one will assigned IP addresses according to
its IP network.
Automatic IP Traffic Routing
The SNMP agent of MX-2100 includes an IP router function, used to route
management messages automatically. The IP router function of each SNMP agent
operates both on the in-band, as well as on the out-of-band traffic, depending if
download bandwidth was enabled in the main link for management.
When using in-band communication, the IP router can receive the management
traffic through each main link, via user-specified bandwidth of main link.
Note