Dell Force10 Z9000 - Create a Layer 2 Class Map

Quality of Service (QoS) | 729
Figure 35-10. Using the Order Keyword in ACLs
Create a Layer 2 class map
All class maps are Layer 3 by default; you can create a Layer 2 class map by specifying the option layer2
with the
class-map command. A Layer 2 class map differentiates traffic according to 802.1p value and/or
characteristics defined in a MAC ACL.
1. Create a match-any class map using the command
class-map match-any or a match-all class map
using the command
class-map match-all from CONFIGURATION mode, and enter the keyword
layer2.
2. Once you create a class-map, FTOS places you in CLASS MAP mode. From this mode, specify your
match criteria using the command
match mac. Match-any class maps allow up to five access-lists, and
match-all class-maps allow only one. You can match against only one VLAN ID.
3. After you specify your match criteria, link the class-map to a queue using the command
service-queue from POLICY MAP mode.
Determine the order in which ACLs are used to classify traffic
When you link class-maps to queues using the command service-queue, FTOS matches the class-maps
according to queue priority (queue numbers closer to 0 have lower priorities). For example, in
Figure 35-10, class-map cmap2 is matched against ingress packets before cmap1.
ACLs acl1 and acl2 have overlapping rules because the address range 20.1.1.0/24 is within 20.0.0.0/8.
Therefore, (without the keyword
order) packets within the range 20.1.1.0/24 match positive against cmap1
and are buffered in queue 7, though you intended for these packets to match positive against cmap2 and be
buffered in queue 4.
FTOS(conf)#ip access-list standard acl1
FTOS(config-std-nacl)#permit 20.0.0.0/8
FTOS(config-std-nacl)#exit
FTOS(conf)#ip access-list standard acl2
FTOS(config-std-nacl)#permit 20.1.1.0/24 order 0
FTOS(config-std-nacl)#exit
FTOS(conf)#class-map match-all cmap1
FTOS(conf-class-map)#match ip access-group acl1
FTOS(conf-class-map)#exit
FTOS(conf)#class-map match-all cmap2
FTOS(conf-class-map)#match ip access-group acl2
FTOS(conf-class-map)#exit
FTOS(conf)#policy-map-input pmap
FTOS(conf-policy-map-in)#service-queue 7 class-map cmap1
FTOS(conf-policy-map-in)#service-queue 4 class-map cmap2
FTOS(conf-policy-map-in)#exit
FTOS(conf)#interface gig 1/0
FTOS(conf-if-gi-1/0)#service-policy input pmap