Solved

how to capture vlan traffic accross multiple cisco switch stacks

Posted on 2013-12-06
2
743 Views
Last Modified: 2013-12-11
I have a need to span traffic for a particular vlan to a single port on one of my core switches for packet capture purposes.
Currently this vlan traffic propagates throughout the network via trunk connections from the core switch to several cisco switch stacks.  So my question is if I setup a monitor session to capture this specific vlan as a source on the core switch, is it going to be enough to capture all the vlan traffic on the network.   Or, do I need to enable some type of RSPAN?  

thank you.
0
Comment
Question by:FREDARCE
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 42

Expert Comment

by:kevinhsieh
ID: 39702796
Are you trying to capture traffic on all ports within the VLAN, or all traffic that crosses the VLAN interface? When you monitor a VLAN interface, you only see the traffic that hits that L3 interface. It's really easy to monitor that L3 interface from the same switch that has the L3 interface. If you also want to capture traffic that stays on the VLAN, you are probably looking at RSPAN, which is something I don't have any experience with.
0
 
LVL 38

Accepted Solution

by:
Rich Rumble earned 500 total points
ID: 39702959
No, the switches only route traffic to other switches when they need to. You'd want a span session on each switch, with the vlan's configured in each span session. You can FWD those spans to the core switch, but make sure you add new trunks if the existing ones will be saturated. Look for RSPAN on cisco's site: (as mentioned above)
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2_55_se/configuration/guide/swspan.html#wp1317252
-rich
0

Featured Post

WordPress Tutorial 1: Installation & Setup

WordPress is a very popular option for running your web site and can be used to get your content online quickly for the world to see. This guide will walk you through installing the WordPress server software and the initial setup process.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
This article explains the fundamentals of industrial networking which ultimately is the backbone network which is providing communications for process devices like robots and other not so interesting stuff.
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question