What is the difference between DSCP 1 and precedence 1?  Does it match
different traffic patterns?

 

Regards,

 

Tyson Scott - CCIE #13513 R&S, Security, and SP

Managing Partner / Sr. Instructor - IPexpert, Inc.

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From: [email protected]
[mailto:[email protected]] On Behalf Of Mark Senteza
Sent: Tuesday, November 23, 2010 2:00 PM
To: [email protected]
Subject: [OSL | CCIE_Security] Yusuf Lab 2 NBAR Troubleshooting

 

Hi again all,

A troubleshooting question in Yusuf Lab 2 (8.2 Troubleshooting NBAR) - I
just wanted clarification on whether or not thats a typo in the solution (or
probably) the question, or if it is the right solution, can somebody throw
some light onto it.

The question specifies Telnet traffic with IP Precedence bit set to 1.

In my solution, I configured as follows

class-map match-all TELNET-PREC1
 match protocol telnet
 match ip precedence 1

vs. Yusuf's solution, which is

class-map match-all drop23 
 match protocol telnet
 match ip dscp 1

His second match statement is matching on the DSCP value, whereas the
question specifies IP Precedence. Is this a mistake on his part or does it
come to the same thing - and if so then how ?

Thanks again

Mark

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