I’ve never bothered to memorize the Cisco descriptions of IP Precedence values (i.e. IP Precedence 4 is “flash-override”). I’ve hit a couple of labs which ask you to manipulate traffic based on these descriptions. For instance:
“Drop all flash traffic coming into r1 from VLAN 6.”
Some commands such as ‘random detect precedence’ only use the 0 – 7 values:
r1(config-if)#random-detect precedence ?
<0-7> IP precedence
rsvp rsvp traffic
You could look this up in the DOC CD, but there’s a quick and dirty way to do this on the command line.
1) Create a class-map.
2) Type ‘match ip precedence ?’ to see the context-sensitive help. This will give you a list of the IP Precedence values along with their descriptions.
3) Get what you need and remember to delete the class-map.
Rack13R6(config-cmap)#match ip precedence ?
<0-7> Enter up to 4 precedence values separated by white-spaces
critical Match packets with critical precedence (5)
flash Match packets with flash precedence (3)
flash-override Match packets with flash override precedence (4)
immediate Match packets with immediate precedence (2)
internet Match packets with internetwork control precedence (6)
network Match packets with network control precedence (7)
priority Match packets with priority precedence (1)
routine Match packets with routine precedence (0)
Rack13R6(config)#no class-map FAKE