Service Manual

20
IPv4 Routing
IPv4 routing is supported on Dell Networking OS.
The Dell Networking Operating System (OS) supports various IP addressing features. This chapter describes the basics of domain
name service (DNS), address resolution protocol (ARP), and routing principles and their implementation in the Dell Networking OS.
IP Feature Default
DNS Disabled
Directed Broadcast Disabled
Proxy ARP Enabled
ICMP Unreachable Disabled
ICMP Redirect Disabled
IP Addresses
Dell Networking OS supports IP version 4, as described in RFC 791. Dell Networking OS also supports classful routing and variable
length subnet masks (VLSM).
With VLSM, you can congure one network with dierent masks. Supernetting, which increases the number of subnets, is also
supported. To subnet, you add a mask 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 about IP addressing, refer to RFC 791, Internet Protocol.
Implementation Information
In Dell Networking OS, you can congure any IP address as a static route except IP addresses already assigned to interfaces.
NOTE: Dell Networking OS supports 31-bit subnet masks (/31, or 255.255.255.254) as dened 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.
Conguration Tasks for IP Addresses
The following describes the tasks associated with IP address conguration.
Conguration tasks for IP addresses includes:
• Assigning IP Addresses to an Interface (mandatory)
• Conguring Static Routes (optional)
• Congure 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.
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IPv4 Routing