Dell PowerConnect B-RX Configuration Manual page 600

21
Configuring numbered and named ACLs
TABLE 97
DSCP value
802.1p (COS)
Value
DSCP Value
Internal
Forwarding
Priority
•
For more information on QoS and internal forwarding queues, refer to
Quality of
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>.
528
The following occurs when you use these parameters:
•
Enter 0 – 63 for the dscp-marking <number> parameter.
•
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
Table 97, the new QoS value for the packet is:
•
802.1p (COS) value: 7
•
DSCP value: 48
•
Internal Forwarding Priority: 0
Example internal QOS table mappings
0 1 2
0 1 2
0 15 20
7 6 5
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
packet's new QoS value is:
•
802.1p (COS) value: 2
•
DSCP value: 15
•
Internal Forwarding Priority: 6
Service".
and the internal QoS table is configured as shown in
3 4 5 6 7
3 4 5 6 7
3 4 5 25 48
4 3 2 1 0
8 9 10 11 12
1 2 3 4 5
8 9 10 11 12
1 3 0 0 0
Table
Chapter 18, "Configuring
BigIron RX Series Configuration Guide
53-1001810-01
13 14
6 7
13 14
0 0
97, the