RouteExplorer™ Tutorial -- Visualization
Show the exit routers for any Internet destination from your network
In a large network with multiple exits routers to theInternet, it is often useful to see which exits are being taken from variouspoints in your network. Thisinformation may help you infer the flow of traffic to your service providers orpeers, assisting you in balancing those flows to achieve optimum performance orminimize monthly cost in transit fees and bandwidth costs.
Route Explorer can show you the exit routers from allrouters in your network or from a single router. Figure 1illustrates the first case. Havingspecified the destination prefix or Internet domain name of your destination(which may be a vendor’s support site -- support.cisco.com, an out-sourcedapplication service provider – Salesforce.com, or a web search site –google.com), Route Explorer calculates the IGP path from each router to itsnearest exit router calculated from BGP. Each router is then color-coded by exit router and exit routers arehighlighted in flashing yellow.
Figure
Route Explorer can also show a route from a specific routerin your network to an Internet destination. Figure 2illustrates this case.
Figure
Note that Route Explorer shows a detailed listing of theroute, showing each hop and how it was resolved. ECMP routes, if they exist, can be shown optionally.
HOW TO:
Show Exit Routers:
- Open the “DemoTier1ISPJun02” topology.
- Select Tools->Highlight By Exit Rtr…
- Enter desired Internet prefix or domain name (e.g. “www.packetdesign.com”) and click “OK”
Show an exit route from a router:
- Select Tools->Find Prefix Path…
- Enter source router’s IP address or router name (ISIS)
- Enter desired Internet prefix or domain name (e.g. “www.packetdesign.com”)
- Click “OK”
- Show list of highlighted paths: Select Tools->List Highlighted Paths
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