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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR
set dscp
Usage Guidelines Once the DSCP bit is set, other quality of service (QoS) features can then operate on the bit settings.
DSCP and Precedence Values Are Mutually Exclusive
The set dscp command cannot be used with the set precedence command to mark the same packet. The
two values, DSCP and precedence, are mutually exclusive. A packet can have one value or the other, but
not both.
Precedence Value and Queueing
The network gives priority (or some type of expedited handling) to marked traffic. Typically, you set the
precedence value at the edge of the network (or administrative domain); data then is queued according
to the precedence. Weighted fair queueing (WFQ) can speed up handling for high-precedence traffic at
congestion points. Weighted Random Early Detection (WRED) ensures that high-precedence traffic has
lower loss rates than other traffic during times of congestion.
Use of the “from-field” Packet-marking Category
If you are using this command as part of the Enhanced Packet Marking feature, you can use this
command to specify the “from-field” packet-marking category to be used for mapping and setting the
DSCP value. The “from-field” packet-marking categories are as follows:
• Class of service (CoS)
• QoS group
If you specify a “from-field” category but do not specify the table keyword and the applicable
table-map-name argument, the default action will be to copy the value associated with the “from-field”
category as the DSCP value. For instance, if you configure the set dscp cos command, the CoS value
will be copied and used as the DSCP value.
Note The CoS field is a three-bit field, and the DSCP field is a six-bit field. If you configure the set dscp cos
command, only the three bits of the CoS field will be used.
If you configure the set dscp qos-group command, the QoS group value will be copied and used as the
DSCP value.
The valid value range for the DSCP is a number from 0 to 63. The valid value range for the QoS group
is a number from 0 to 99. Therefore, when configuring the set dscp qos-group command, note the
following points:
• If a QoS group value falls within both value ranges (for example, 44), the packet-marking value will
be copied and the packets will be marked.
• If QoS group value exceeds the DSCP range (for example, 77), the packet-marking value will not
be copied and the packet will not be marked. No action is taken.
Set DSCP Values in IPv6 Environments
When this command is used in IPv6 environments, the default match occurs on both IP and IPv6 packets.
However, the actual packets set by this function are only those which meet the match criteria of the
class-map containing this function.
Set DSCP Values for IPv6 Packets Only
To set DSCP values for IPv6 values only, the match protocol ipv6 command must also be used. Without
that command, the precedence match defaults to match both IPv4 and IPv6 packets.
- Release 15.1(3)MR 1
- Configuring a Policy Map 14
- Restrictions 15
- Policy Map Configuration Mode 27
- Class Characteristics 27
- Predefined Default Class 27
- Tail Drop or WRED 27
- Fragments 28
- If ID Choice Is Anything Else 72
- Unique Device Identifier 73
- Cisco HWIC-4SHDSL 88
- SNAP Encapsulation Example 96
- OL-26895-01 105
- • n393—1 to 10. Default is 4 133
- • proxy-register 187
- • list access-list 187
- • route-map map-name 187
- Support for Serial Lines 194
- Syntax Description 195
- Keepalive Time Interval 203
- Line Failure 203
- Dropped Packets 203
- DSCP Values 226
- Match Packets on DSCP Values 227
- • match access-group 231
- • match input-interface 231
- • match mpls experimental 231
- • match protocol 231
- Precedence Values and Names 233
- IPv4-Specific Traffic Match 233
- IPv6-Specific Traffic Match 234
- Support Restrictions 237
- ATM Mode Example 247
- CAS Mode Example 247
- Router(config)# no mpls ip 250
- Release 12.2(33)SRB 259
- • QL-PRC 275
- • QL-SSU-A 275
- • QL-SSU-B 275
- • QL-SEC 275
- • QL-DNU 275
- All Supported Platforms 303
- Hierarchical Policy Maps 304
- How Bandwidth Is Calculated 305
- • conform-action is transmit 311
- • exceed-action is drop 311
- • violate-action is drop 311
- Token Buckets 314
- Updating Token Buckets 315
- Marking Traffic 315
- Two-Rate Policing 316
- Syntax for Percent 318
- Command Application 332
- • Data encapsulation type 334
- • Control protocol 334
- • 4—1 packet every 16 seconds 336
- • 3—1 packet every 8 seconds 336
- • 2—1 packet every 4 seconds 336
- • 1—1 packet every 2 seconds 336
- • 0—1 packet every second 336
- Command Description 341
- Router(config)# exit 358
- Weighted Fair Queueing 366
- • Control network loops 376
- • Handle link failures 376
- • Improve convergence time 376
- the following adapters: the 409
- to specify the “from-field” 412
- • EF (expedited forwarding) 420
- Precedence Value and Queueing 421
- 2. ip tos reflect 429
- 3. ip tos tos-value 429
- Command Compatibility 440
- Bit Settings 440
- Precedence Value 441
- Committed Information Rate 449
- IMA Group 456
- M-PAIR Group 456
- 1-PAIR and 2-PAIR Group 456
- DSL Group with 1 Pair 458
- DSL Group with 2 Pairs 458
- DSL Group with 3 Pairs 458
- DSL Group with 4 Pairs 458
- • Interface name and number 471
- • Identifier (group ID) 475
- ADSL: Example 490
- • Domain name 495
- • Domain index 495
- • Domain level 495
- Field Description 504
- Reliability Errors 524
- Protocol Errors 524
- UNI Id Identifier of the UNI 526
- EVC Id Identifier of the EVC 526
- • Local and remote OAM mode 528
- • Remote platform identity 528
- • Remote loopback events 531
- Traffic Policing: Example 583
- Tunnel Marking: Example 588
- ATM Shared Port Adapter 590
- (continued) 595
- Policing 597
- Policing and Shaping 599
- Traffic Shaping: Example 600
- UDP encapsulation 613
- • priority is 128 647
- Router(config-if)# 648
- • Up to 2 queues 670
- • Up to 2 interfaces 670
- • 1 queue and 1 interface 670
- Router(config-if)# switchport 672
- GRE Tunneling Example 693
- Peak Value 705
- Average Value 705
- Burst Value 705
- Activating the Primary Member 709
- Activating the Backup Member: 709
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