Solved

Cisco Switch Monitor port

Posted on 2006-10-31
8
6,923 Views
Last Modified: 2008-04-15
Trying on two model's of cisco switches to get a monitoring port working.  I've found the cisco page to do this and according to it all that needs to be done is:
config mode choose the port you want to be the source port interface Fa0/1 or whatever

then choose the ports you want to monitor by:
port monitor fa0/2...

However i'm on a 3560 and the port monitor command isn't even an option at this point.  Is there something needed to turn this on first?
Thanks,
0
Comment
Question by:stamperb
[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
  • 4
  • 3
8 Comments
 
LVL 3

Expert Comment

by:ctrost
ID: 17844336
0
 
LVL 1

Author Comment

by:stamperb
ID: 17850210
OK i've got it going but when i try to add a second destination port i get:
% This platform allows a maximum of 1 monitor destination(s)

Now this is on a 4507R... I'd presume it can do more than this.
0
 
LVL 1

Author Comment

by:stamperb
ID: 17852396
Maybe the whole story would help.  I have a snort box that i want to monitor my LAN with.  My lan consists of a core 4507R and about 12 3560's.  Each of the 3560's is connected back to the 4507R via fiber.  So presumably i'd place the snort ids box on a port monitoring all the other switches and ports.  Just need to figure out how to do this.
0
Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

 
LVL 3

Expert Comment

by:ctrost
ID: 17852587
"A destination port can participate in only one SPAN session at a time. A destination port in one SPAN session cannot be a destination port for a second SPAN session."

4507R(config)#monitor session 1 source interface fastethernet 4/2
!--- This configures interface Fast Ethernet 4/2 as source port.

4507R(config)#monitor session 1 destination interface fastethernet 4/3
!--- The configures interface Fast Ethernet 0/3 as destination port.

Then try doing "monitor session 2 source" and "monitor session 2 destination".  You need different SPAN sessions for each port you want to monitor..................................... I think.


0
 
LVL 1

Author Comment

by:stamperb
ID: 17852673
So the answer is simply that I can not monitor more than 1 port at a time?  I can't hardly believe that is the case.  If this was the case how would IDS work at all in a switched environment.  I know on the HP switches you tell it what port to source and all the destination ports.  
0
 
LVL 3

Accepted Solution

by:
ctrost earned 500 total points
ID: 17852770
?? Yes you can, just create multiple sessions like above...  then do:
show monitor session 1...or
show monitor session 2

or just show monitor session

i really believe all the information you need (informational as well as configurational) is on the link I posted above......to be honest I don't know anything more about it than you do, I'm just relaying information from that webpage as I interpret it

0
 
LVL 1

Author Comment

by:stamperb
ID: 17853388
OK well i did that for 1 session.  So basically monitoring 1 port that came from 1 of the 3560's.  I no more than turned it on before i hear people next to me saying they've lost connectivity to the exchange server and other shares.  I decided maybe this was a fluke and changed it to another one on a different floor.  Again I heard that people were having issues?  So i presume its causing some problems?  Would this really be the case?  I can't see that it would be dropping things like this for just 1 port worth of traffic?
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
avi rca in to vga out 4 45
Hypervisor 1 U 10 65
new laptop new users 8 70
4.74 vdc vs 5.00 vdc  USB 2 22
In this article you will get to know about pros and cons of storage drives HDD, SSD and SSHD.
Does your iMac really need a hardware upgrade? Will upgrading RAM speed-up your computer? If yes, then how can you proceed? Upgrading RAM in your iMac is not as simple as it may seem. This article will help you in getting and installing right RA…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…
How to Install VMware Tools in Red Hat Enterprise Linux 6.4 (RHEL 6.4) Step-by-Step Tutorial

749 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