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Old 10-21-2010, 01:08 PM
lgao lgao is offline
Join Date: May 2009
Posts: 34
Default The way I use NB: Is my network stable?

Somewhere in my network,
1) links are flapping,
2) routers are rebooting
3) somebody is making changes to EIGRP distribution list during the day
4) OSPF/EIGRP/BGP peering is resetting

How can I find out?

Step1: Create a Qmap including a few core routers which have most routes in your network. (gateway routers for your network management segment are good candidtates)

Step2: Run a routing benchmark from the map, and save the data into a folder called "snapshot1"

Step3: Wait for 30 seconds, and run another benchmark and save data into folder called "snapshot2"

Step4: Compare routing table between snapshot1 and snapshot2.

--> Click the routers with Add/Del/Modified route entries, and drag and drop each entry into a map.

Step 5: Enter the destination of problematic route into Search dialog to find out where the route is sourced from.

The source might be:
* Flapping link
* Rebooting routers
* Neighbor reset
* Distribution list modification in EIGRP

Note: You can examine and compare route tables for one router to achieve similar effects... in that case, you just need to launch routing table toolkit for that routers.

Last edited by lgao; 10-25-2010 at 08:41 PM.
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Old 11-05-2010, 05:50 PM
lgao lgao is offline
Join Date: May 2009
Posts: 34
Default Re: The way I use NB: Is my network stable?

To discover unstable network elements, try sorting routing table by "age" field inside NetBrain. For the routes with age of seconds, drag-and-drop them to the map and trace to the source...

They are not stable.
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BGP, CCIE, IGRP/EIGRP, one-skill-at-a-time, OSPF, Routing

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