Solved

Cisco router CPU spike after adding monitor session to remote-span vlan

Posted on 2011-03-02
2
1,005 Views
Last Modified: 2012-05-11
What could have caused this?


Today we added a monitor port on one of our routers.

This is a standard procedure that we have performed in the past on several other devices.

A physical interface (uplink port) was set as the source and the remote vlan was set as the destination.

The remote vlan was only trunked across a single link to another router.

The other router was setup with a monitor source of the remote vlan and destination of the physical uplink to the sniffer.

Both of the routers in question are part of an HSRP pair.

Both of the routers in question are running FWSM.

When the monitor port was enabled, the cpu usage spiked to 100% causing HSRP flapping.

The remote router was no longer responding to pings due to cpu usage.

0
Comment
Question by:c-h-r-i-s-t-o-p-h
[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 24

Accepted Solution

by:
rfc1180 earned 500 total points
ID: 35021999
0
 

Author Closing Comment

by:c-h-r-i-s-t-o-p-h
ID: 35038057
device is a 6500 series router
0

Featured Post

Why Off-Site Backups Are The Only Way To Go

You are probably backing up your data—but how and where? Ransomware is on the rise and there are variants that specifically target backups. Read on to discover why off-site is the way to go.

Question has a verified solution.

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

PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
When you try to share a printer , you may receive one of the following error messages. Error message when you use the Add Printer Wizard to share a printer: Windows could not share your printer. Operation could not be completed (Error 0x000006…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

751 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