Specifications

CHAPTER
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10-1
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
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Configuring Static Routing
This chapter describes how to configure static routing on the switch.
This chapter includes the following sections:
• Information About Static Routing, page 10-1
• Licensing Requirements for Static Routing, page 10-3
• Prerequisites for Static Routing, page 10-3
• Guidelines and Limitations, page 10-3
• Default Settings, page 10-3
• Configuring Static Routing, page 10-4
• Verifying the Static Routing Configuration, page 10-6
• Configuration Examples for Static Routing, page 10-6
• Additional References, page 10-6
• Feature History for Static Routing, page 10-7
Information About Static Routing
Routers forward packets using either route information from route table entries that you manually
configure or the route information that is calculated using dynamic routing algorithms.
Static routes, which define explicit paths between two routers, cannot be automatically updated; you
must manually reconfigure static routes when network changes occur. Static routes use less bandwidth
than dynamic routes. No CPU cycles are used to calculate and analyze routing updates.
You can supplement dynamic routes with static routes where appropriate. You can redistribute static
routes into dynamic routing algorithms but you cannot redistribute routing information calculated by
dynamic routing algorithms into the static routing table.
You should use static routes in environments where network traffic is predictable and where the network
design is simple. You should not use static routes in large, constantly changing networks because static
routes cannot react to network changes. Most networks use dynamic routes to communicate between
routers but may have one or two static routes configured for special cases. Static routes are also useful
for specifying a gateway of last resort (a default router to which all unroutable packets are sent).
This section includes the following topics:
• Administrative Distance, page 10-2