Articles

Network basics – Static Route

In Network Basics on April 17, 2011 by carlosfvc Tagged: ,

A static route can be used in the following circumstances:
• When it is undesirable to have dynamic routing updates forwarded across slow bandwidth links, such
as a dialup link.
• When the administrator needs total control over the routes used by the router.
• When a backup to a dynamically recognized route is necessary.• When it is necessary to reach a network accessible by only one path (a stub network).
• When a router connects to its ISP and needs to have only a default route pointing toward the ISP
router, rather than learning many routes from the ISP.
• When a router is underpowered and does not have the CPU or memory resources necessary to handle
a dynamic routing protocol.

Advantages:

– A perfect use for static routing is a hub-and-spoke design, with all remote sites defaulting back to the central
site (the hub) and the one or two routers at the central site having a static route for all subnets at each
remote site.

Disavantages:

– without proper design, as the network grows into hundreds of routers, with each
router having numerous subnets, the number of static routes on each router also increases. Each time a new
subnet or router is added, an administrator must add a static route to the new networks on several routers.

– Topology change occurs on the internetwork, an administrator might have to reroute traffic by configuring new static routes around the problem area.

Configuring a Static Route
ip route prefix mask {address | interface [address]} [dhcp] [distance] [name next-hop-name]
[permanent| track number] [tag tag] global configuration command

Verification

show ip route

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