Dell PowerConnect B-RX - Configuring Standard or Extended Named Acls

BigIron RX Series Configuration Guide 539
53-1002253-01
Configuring numbered and named ACLs
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• The dscp-cos-mapping parameter takes the DSCP value you specified and compares it to
an internal QoS table, which is indexed by DSCP values. The corresponding 802.1p priority,
internal forwarding priority, and DSCP value is assigned to the packet.
For example, if you enter dscp-marking 7 and the internal QoS table is configured as
shown in Table 101, the new QoS value for the packet is:
• 802.1p (COS) value: 7
• DSCP value: 48
• Internal Forwarding Priority: 0
• Use the DSCP value in the packet’s header to alter its QoS value. Enter the following
parameter.
dscp-cos-mapping
When you enter dscp-cos-mapping, the DSCP value in the packet’s header is compared to a
column in the internal QoS table. The 802.1p priority, internal forwarding priority, and DSCP
value that are mapped to the matching column is assigned to the packet.
For example, if the DSCP value in the packet’s header is 2, using the mappings in Table 101,
the packet’s new QoS value is:
• 802.1p (COS) value: 2
• DSCP value: 15
• Internal Forwarding Priority: 6
For more information on QoS and internal forwarding queues, refer to Chapter 18, “Configuring
Quality of Service”.
Parameters to bind standard ACLs to an interface
Use the ip access-group command to bind the ACL to an interface and enter the ACL number for
<num>.
Configuring standard or extended named ACLs
The commands for configuring named ACL entries are different from the commands for configuring
numbered ACL entries. The command to configure a numbered ACL is access-list. The command
for configuring a named ACL is ip access-list. In addition, when you configure a numbered ACL
entry, you specify all the command parameters on the same command. When you configure a
named ACL, you specify the ACL type (standard or extended) and the ACL number with one
command, which places you in the configuration level for that ACL. Once you enter the
configuration level for the ACL, the command syntax is the same as the syntax for numbered ACLs.
TABLE 101 Example internal QOS table mappings
DSCP value 01234567891011121314
802.1p (COS)
Value
012345671234567
DSCP Value 015203452548891011121314
Internal
Forwarding
Priority
765432101300000