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If you're looking for real history, the only efficient way to do it is with a tool that polls the router using SNMP. MRTG is a great free tool and it's not just for routers, you can poll and graph pretty much anything. Check out <a href="http://people.ee.ethz.ch/~oetiker/webtools/mrtg/users.html" rel="ugc">http://people.ee.ethz.ch/~oetiker/webtools/mrtg/users.html</a>&nbsp;for some examples and <a href="http://people.ee.ethz.ch/~oetiker/webtools/mrtg/" rel="ugc">http://people.ee.ethz.ch/~oetiker/webtools/mrtg/</a>&nbsp;to get it.<br />
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There are other tools that do the same thing but you have to pay for them.<br />
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For very short-term stats you can use &quot;show interface serial x/x&quot;
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If you're looking for real history, the only efficient way to do it is with a tool that polls the router using SNMP. MRTG is a great free tool and it's not just for routers, you can poll and graph pretty much anything. Check out http://people.ee.ethz.ch/~oetiker/webtools/mrtg/users.html [http://people.ee.ethz.ch/~oetiker/webtools/mrtg/users.html] for some examples and http://people.ee.ethz.ch/~oetiker/webtools/mrtg/ [http://people.ee.ethz.ch/~oetiker/webtools/mrtg/] to get it.

There are other tools that do the same thing but you have to pay for them.

For very short-term stats you can use "show interface serial x/x"

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I need an easy way to look at the aveage utilization of a T1 circuit running through a cisco 1721.<br />
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I am basically looking for some indications of how much spare bandwidth I have over a given period of time....<br />
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Any suggestions are greatly appreicated. &nbsp;Keep in mind I don't work on Cisco's very often.
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I need an easy way to look at the aveage utilization of a T1 circuit running through a cisco 1721.

I am basically looking for some indications of how much spare bandwidth I have over a given period of time....

Any suggestions are greatly appreicated.  Keep in mind I don't work on Cisco's very often.

Determining T1 utilization accross cisco 1721

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.