Static Route Configuration Builder

About this interactive

What you're seeing: a Cisco IOS static route command with the prompt and the rest of the line already written, and the one piece that carries the meaning left blank for you to type. Twenty-three items cover the whole of this module — the ordinary ip route command, the default route in IPv4 and IPv6, the host route, the floating static backup, and the routing table entries all of them produce. Why it matters: a static route is four values on one line and every one of them is a place to be wrong in a way the router will not warn you about. A mask one bit too wide swallows networks you meant to route elsewhere; a next hop that is not actually adjacent produces a route that installs and then drops every packet; a floating static with no distance after it ties with the primary instead of backing it up. None of those look like errors on the CLI — they look like a command that was accepted. How to use it: read the prompt in front of each command first, and read the whole line before you fill the gap, because the destination and the mask constrain each other. Type addresses and masks in full dotted-decimal exactly as IOS wants them; capital letters do not matter and abbreviations a real device would accept are marked wrong here. Anything you miss shows the value it wanted plus a hint explaining what that value means and what breaks when it is off. Eight of the twenty-three are drawn each run, so running it twice gives you a different sheet.

What you'll learn

Type the IPv4 static route command a piece at a time — the ip route keyword pair, the destination network, the subnet mask that fixes how much of that network the route covers, and the next-hop address or exit interface that terminates the line
Type the default route in both address families — quad-zero 0.0.0.0 0.0.0.0 for IPv4 and ::/0 for IPv6 — and the ipv6 unicast-routing command that IPv6 static routing does nothing without
Type the 255.255.255.255 mask that narrows a static route to a single host, and state the prefix length that mask is written as in the routing table
Type the trailing administrative distance that turns an ordinary static route into a floating static backup, and state the distance a static route carries when no number follows it
Read a show ip route entry — the S code that marks a static route, the asterisk that marks the candidate default, and the two numbers in brackets that are the administrative distance and the metric

Aligned to

Cisco CCNA

3.3 Configure and verify IPv4 and IPv6 static routing

1.6 Configure and verify IPv4 addressing and subnetting

3.2 Determine how a router makes a forwarding decision by default

3.1 Interpret the components of routing table

Key terms

Static Route: A routing table entry manually configured by an administrator that specifies a fixed path to a destination network and never changes unless the administrator modifies it. Static routes are simple and predictable but do not adapt automatically to network topology changes.
Subnet Mask: A 32-bit number that divides an IP address into network and host portions.
Next Hop: The IP address of the immediately adjacent router that a packet is forwarded to on the way toward its final destination. A router's routing table entry for each network destination includes the next-hop address so the router knows where to send the packet.
Default Route: A catch-all routing entry represented as 0.0.0.0/0 (IPv4) or ::/0 (IPv6) that a router uses to forward packets when no more specific matching route exists in the routing table. It is typically configured to point toward the next-hop router or ISP connection.
Static Default Route: A manually configured catch-all route using quad-zero notation (0.0.0.0/0 for IPv4 or ::/0 for IPv6) that forwards all unknown traffic to a specified next-hop device.
Quad-Zero Notation: The use of 0.0.0.0 0.0.0.0 in IPv4 or ::/0 in IPv6 to represent a default route that matches all destination addresses.
Static Host Route: A manually configured route that directs traffic to a single specific host using a /32 subnet mask, rather than an entire network.
Administrative Distance: A value assigned to a route that indicates its trustworthiness or preference; lower values are preferred when multiple routes to the same destination exist.
Floating Static Route: A static route configured with a higher administrative distance than the primary route, functioning as a backup that activates only when the preferred route is removed from the routing table.
Summary Route: A single static route that represents a range of network addresses, reducing the number of entries in a routing table.
RFC 3021: A standard that permits the use of /31 prefixes on point-to-point links, allowing both addresses in the subnet to be assigned to interfaces and eliminating the need for a separate network and broadcast address.

Topics

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