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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

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MDS MX-2104 Specifiche Pagina 164