Dell BigIron RX Series, Configuration Manual

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538 BigIron RX Series Configuration Guide
53-1002253-01
Configuring numbered and named ACLs
21
Parameters to alter a packet’s QoS value
The parameters discussed in the sections above are used to filter packets. If the packets match the
filters in an ACL statement, the packet is either permitted or denied. Once a packet is permitted,
you can alter its QoS value by assigning a new DSCP value, 802.1p priority, and internal forwarding
priority to the packet by doing
one of the following:
•
Specify a new QoS value to the packet by entering values for the following parameters.
Syntax: dscp-marking <number> 802.1p-priority-marking <number> internal-priority-marking
<number>
For example, you enter the following.
dscp-marking 12 802.1p-priority-marking 1 internal-priority-marking 5
The packet’s new QoS value is:
•
802.1p (COS) value: 1
•
DSCP value: 12
•
Internal Forwarding Priority: 5
•
Specify a DSCP value and map that value to an internal QoS table to obtain the packet’s new
QoS value. Use the following parameters.
dscp-marking <number> dscp-cos-mapping
The following occurs when you use these parameters:
•
Enter 0 – 63 for the dscp-marking <number> parameter.
•
tos <name> | <num> Specify the IP ToS name or number. You can specify one of the following:
•
max-reliability or 2 – The ACL matches packets that have the
maximum reliability ToS. The decimal value for this option is 2.
•
max-throughput or 4 – The ACL matches packets that have the
maximum throughput ToS. The decimal value for this option is 4.
•
min-delay or 8 – The ACL matches packets that have the minimum
delay ToS. The decimal value for this option is 8.
•
normal or 0 – The ACL matches packets that have the normal ToS.
The decimal value for this option is 0.
•
<num> – A number from 0 – 15 that is the sum of the numeric
values of the options you want. The ToS field is a four-bit field
following the Precedence field in the IP header. You can specify one
or more of the following. To select more than one option, enter the
decimal value that is equivalent to the sum of the numeric values
of all the ToS options you want to select. For example, to select the
max-reliability and min-delay options, enter number 10. To select
all options, select 15.
•
802.1p-priority-matching <number> Only packets that have the specified 802.1p priority will be matched.
Valid range is 0-7.
dscp-marking <number> If a packet matches the filters in the ACL statement, this parameter assigns the
DSCP value that you specify to the packet. Enter 0 – 63.
802.1p-priority-marking
<number>
If a packet matches the filters in the ACL statement, this parameter assigns the
802.1p priority that you specify to the packet. Enter 0 – 7.
internal-priority-marking
<number>
If a packet matches the filters in the ACL statement, this parameter assigns the
internal priority that you specify to the packet. Enter 0 – 7.