<div>
The Cisco NBAR system is your best bet: <br />
If your release of IOS supports NBAR, simply add the 'ip nbar protocol-discovery' configuration command to the interface that your users are using as their default gateway. <br />
<br />
For example:<br />
<br />
ROUTER1#config t<br />
Enter configuration commands, one per line. End with CNTL/Z.<br />
ROUTER1(config)#interface FastEthernet0/0<br />
ROUTER1(config-if)#ip nbar protocol-discovery<br />
ROUTER1(config-if)#^Z<br />
ROUTER1#wr<br />
Building configuration...<br />
[OK]<br />
<br />
Once NBAR is gathering data, you can use the 'show ip nbar resources' command to see how much memory it's taking up. As long as the numbers are acceptable, you can leave NBAR protocol discovery running as long as you like. <br />
<br />
To see the really interesting information, issue 'show ip nbar protocol-discover' and look at all the protocols flowing to (and perhaps through) your router. <br />
<br />
To limit outputs use the following: show ip nbar protocol-discovery top-n X (where X is the number of protocols you wish to monitor).<br />
<br />
You can then apply this to other interfaces if need be to drill down.
</div>


<div>
<div class="content wysiwyg-content">
Hello EE,<br />
<br />
We manage our own routers: Cisco 2921<br />
Some sites have excessive usage and are requesting bandwidth but for the number of users I'd prefer to check what is using up the bandwidth at these couple sites before hand. &nbsp;Our vendor doesn't do any network monitoring (ISP) and we don't currently have Netflow setup or a server to monitor. &nbsp;I'm wondering if there are commands I could go in and see what:1. top protocol used &nbsp;2. top send/receive IP.<br />
<br />
Thanks
</div>
</div>


Hello EE,

We manage our own routers: Cisco 2921
Some sites have excessive usage and are requesting bandwidth but for the number of users I'd prefer to check what is using up the bandwidth at these couple sites before hand.  Our vendor doesn't do any network monitoring (ISP) and we don't currently have Netflow setup or a server to monitor.  I'm wondering if there are commands I could go in and see what:1. top protocol used  2. top send/receive IP.

Thanks

With several sites on MPLS and Cisco Routers wondering how to view top protocol/talker

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.

Routers

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.