Matching IP Precedence in VoIP ACLs

From: Umair Hoodbhoy (umair@cisco.com)
Date: Sun Feb 23 2003 - 21:13:52 GMT-3


Hier,

Searching through the archives of this group and various docs I've
always come across this ACL for matching VoIP traffic:

 access-list 101 permit udp any any range 16384 32767

My question is why don't people use this instead:

 access-list 101 permit udp any any range 16384 32767 precedence
critical
 ?

IP Precedence 5 is 'critical' and my understanding is that VoIP
appliances like IP Phones transmit IP with that precedence. Is this a
fair question to ask a proctor or should we know this before walking
into the exam?

TIA,

-- Umair



This archive was generated by hypermail 2.1.4 : Sat Mar 01 2003 - 11:06:32 GMT-3