Reference Guide

462 | IPv4 Routing
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IP Addresses
Dell Networking OS supports IP version 4, as described in RFC 791. It also supports classful routing and
Variable Length Subnet Masks (VLSM). With VLSM one network can be can configured with different
masks. Supernetting, which increases the number of subnets, is also supported. Subnetting is when a mask
is added to the IP address to separate the network and host portions of the IP address.
At its most basic level, an IP address is 32-bits composed of network and host portions and represented in
dotted decimal format. For example,
00001010110101100101011110000011
is represented as 10.214.87.131.
For more information on IP addressing, refer to RFC 791,
Internet Protocol.
Implementation Information
In Dell Networking OS, you can configure any IP address as a static route except IP addresses already
assigned to interfaces.
Configuration Task List for IP Addresses
The following list includes the configuration tasks for IP addresses:
• Assigning IP addresses to an interface (mandatory)
• Configuring static routes (optional)
• Configuring static routes for the management interface (optional)
For a complete listing of all commands related to IP addressing, refer to the
Dell Networking OS Command
Line Interface Reference Guide.
Assigning IP addresses to an interface
Assign primary and secondary IP addresses to physical or logical (for example, VLAN or port channel)
interfaces to enable IP communication between the S5000 and hosts connected to that interface. In Dell
Networking OS, you can assign one primary address and up to 255 secondary IP addresses to each
interface.
Note: Dell Networking OS support 31-bit subnet masks (/31, or 255.255.255.254) as defined by RFC 3021.
This feature allows you to save two more IP addresses on point-to-point links than 30-bit masks. Dell
Networking OS supports RFC 3021 with ARP.