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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
police (two rates)
Updating Token Buckets
The following scenario illustrates how the token buckets are updated:
A packet of B bytes arrives at time t. The last packet arrived at time t1. The CIR and the PIR token
buckets at time t are represented by Tc(t) and Tp(t), respectively. Using these values and in this scenario,
the token buckets are updated as follows:
Tc(t) = min(CIR * (t-t1) + Tc(t1), Bc)
Tp(t) = min(PIR * (t-t1) + Tp(t1), Be)
Marking Traffic
The two-rate policer marks packets as either conforming, exceeding, or violating a specified rate. The
following points (using a packet of B bytes) illustrate how a packet is marked:
• If B > Tp(t), the packet is marked as violating the specified rate.
• If B > Tc(t), the packet is marked as exceeding the specified rate, and the Tp(t) token bucket is
updated as Tp(t) = Tp(t) – B.
Otherwise, the packet is marked as conforming to the specified rate, and both token buckets—Tc(t) and
Tp(t)—are updated as follows:
Tp(t) = Tp(t) – B
Tc(t) = Tc(t) – B
For example, if the CIR is 100 kbps, the PIR is 200 kbps, and a data stream with a rate of 250 kbps arrives
at the two-rate policer, the packet would be marked as follows:
• 100 kbps would be marked as conforming to the rate.
• 100 kbps would be marked as exceeding the rate.
• 50 kbps would be marked as violating the rate.
Marking Packets and Assigning Actions Flowchart
The flowchart in Figure 1-1 illustrates how the two-rate policer marks packets and assigns a
corresponding action (that is, violate, exceed, or conform) to the packet.
- 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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