Foundry Configuration Guide for the FESX, FSX, and FWSX
12 - 24 © Foundry Networks, Inc. December 2005
The dscp-marking <dscp-value> parameter maps a DSCP value to an internal forwarding priority. The DSCP
value can be from 0 – 63.
Using an ACL to Change the Forwarding Queue
The 802.1p-priority-marking <0 – 7> parameter re-marks the packets of the 802.1Q traffic that match the ACL
with this new 802.1p priority, or marks the packets of the non-802.1Q traffic that match the ACL with this 802.1p
priority, later at the outgoing 802.1Q interface.
The 802.1p priority mapping is shown in Table 12.2.
The internal-priority-marking <0 – 7> parameter assigns traffic that matches the ACL to a specific hardware
forwarding queue (qosp0 – qosp7>.
NOTE: The internal-priority-marking parameter overrides port-based priority settings.
In addition to changing the internal forwarding priority, if the outgoing interface is an 802.1Q interface, this
parameter maps the specified priority to its equivalent 802.1p (CoS) priority and marks the packet with the new
802.1p priority. Table 12.2 lists the default mappings of hardware forwarding queues to 802.1p priorities on the
FESX and FSX.
The complete CLI syntax for 802.1p priority marking and internal priority marking is shown in “Configuring
Extended Numbered ACLs” on page 12-8 and “Configuring Extended Named ACLs” on page 12-13. The
following shows the syntax specific to these features.
Syntax: ... dscp-marking <0 – 63> 802.1p-priority-marking <0 – 7> internal-priority-marking <0 – 7>]
DSCP Matching
The dscp-matching option matches on the packet’s DSCP value. This option does not change the packet’s
forwarding priority through the device or mark the packet.
To configure an ACL that matches on a packet with DSCP value 29, enter a command such as the following:
FESX424 Router(config)# access-list 112 permit ip 1.1.1.0 0.0.0.255 2.2.2.x
0.0.0.255 dscp-mapping 29
The complete CLI syntax for this feature is shown in “Configuring Extended Numbered ACLs” on page 12-8 and
“Configuring Extended Named ACLs” on page 12-13. The following shows the syntax specific to this feature.
Syntax: ...dscp-matching <0 – 63>
NOTE: For complete syntax information, see “Extended Numbered ACL Syntax” on page 12-8.
ACL-Based Rate Limiting
Software releases 02.3.03 and later provide support for IP ACL-based rate limiting of inbound traffic. ACL-based
rate limiting provides the facility to limit the rate for IP traffic that matches the permit conditions in extended IP
ACLs. This feature is available in the Layer 2 and Layer 3 code.
For more details, including configuration procedures, see the chapter “Traffic Policies” on page 15-1.
Table 12.2: Default Mapping of Forwarding Queues to 802.1p Priorities
Forwarding
Queue
qosp0 qosp1 qosp2 qosp3 qosp4 qosp5 qosp6 qosp7
802.1p 01234567
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