Users Guide

and are buffered in queue 7, though you intended for these packets to match positive against cmap2 and be
buffered in queue 4.
In cases such as these, where class-maps with overlapping ACL rules are applied to different queues, use the
order keyword to specify the order in which you want to apply ACL rules. The order can range from 0 to
254. The Dell Networking OS writes to the CAM ACL rules with lower-order numbers (order numbers closer
to 0) before rules with higher-order numbers so that packets are matched as you intended. By default, all ACL
rules have an order of 254.
Example of the order Keyword to Determine ACL Sequence
Dell(conf)#ip access-list standard acl1
Dell(config-std-nacl)#permit 20.0.0.0/8
Dell(config-std-nacl)#exit
Dell(conf)#ip access-list standard acl2
Dell(config-std-nacl)#
permit 20.1.1.0/24 order 0
Dell(config-std-nacl)#exit
Dell(conf)#class-map match-all cmap1
Dell(conf-class-map)#match ip access-group acl1
Dell(conf-class-map)#exit
Dell(conf)#class-map match-all cmap2
Dell(conf-class-map)#match ip access-group acl2
Dell(conf-class-map)#exit
Dell(conf)#policy-map-input pmap
Dell(conf-policy-map-in)#service-queue 7 class-map cmap1
Dell(conf-policy-map-in)#service-queue 4 class-map cmap2
Dell(conf-policy-map-in)#exit
Dell(conf)#interface gig 1/0
Dell(conf-if-gi-1/0)#service-policy input pmap
IP Fragment Handling
The Dell Networking OS supports a configurable option to explicitly deny IP fragmented packets, specifically
second and subsequent packets.
It extends the existing ACL command syntax with the fragments keyword for all Layer 3 rules applicable to
all Layer protocols (permit/deny ip/tcp/udp/icmp).
• Both standard and extended ACLs support IP fragments.
• Second and subsequent fragments are allowed because a Layer 4 rule cannot be applied to these
fragments. If the packet is denied eventually, the first fragment is denied and the packet as a whole
cannot be reassembled.
• Implementing the required rules uses a significant number of CAM entries per TCP/UDP entry.
• For IP ACL, Dell Networking OS always applies implicit deny. You do not have to configure it.
• For IP ACL, Dell Networking OS applies implicit permit for second and subsequent fragment just prior to
the implicit deny.
• If you configure an explicit deny, the second and subsequent fragments do not hit the implicit permit
rule for fragments.
• Loopback interfaces do not support ACLs using the IP fragment option. If you configure an ACL with
the
fragments option and apply it to a Loopback interface, the command is accepted but the ACL
entries are not actually installed the offending rule in CAM.
Access Control Lists (ACLs) 149