Cisco MWR 2941 Installation Manual Page 694
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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
tx-limit
tx-limit
To specify the number of transmit buffers for an ATM virtual circuit (VC), use the tx-limit command in
ATM VC, VC-bundle, VC-class, or VC-range configuration mode. To reset the number of transmit
buffers for a particular VC to the default value, use the no form of this command.
tx-limit buffers
no tx-limit
Syntax Description
Defaults Automatically computed from the VC line rate to produce a default latency of 100 milliseconds (or
whatever value is specified by the atm tx-latency command).
Command Modes Interface-ATM-VC configuration (for an ATM VC)
VC-bundle configuration
VC-class configuration
VC-range configuration
Command History
Usage Guidelines When you configure a VC on an ATM SPA interface, the Cisco IOS software automatically determines
the maximum number of transmit buffers that are needed by the VC for its outgoing traffic. The
Cisco IOS software uses both the configured VC line rate and latency value to calculate the number of
buffers. Each transmit buffer can contain an ATM cell (53 bytes).
By default, each VC uses the latency value that is specified by the atm tx-latency command, which
defaults to 100 milliseconds. The maximum number of transmit buffers is then calculated, so that traffic
at the maximum VC line rate can still be transmitted within this latency value.
If a particular VC’s traffic flow requires a different latency value, use the tx-limit command to manually
configure the number of transmit buffers for that VC. This allows you to fine-tune the latency value on
a per-VC basis, without affecting the other VCs on the interface.
buffers Specifies the number of buffers to be used for this VC. The valid range is 2
to 57343, with a default value that is based on the current VC line rate.
Note Avoid configuring the buffer value as 1, as this can cause a traffic
error on the Cisco MWR 2941.
Release Modification
12.2(18)SXE This command was introduced for the ATM Shared Port Adapters (SPA) on
Catalyst 6500 series switches and Cisco 7600 series routers.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)MRB This command was integrated into Cisco IOS Release 12.2.(33)MRB.
15.0(1)MR This command was integrated into Cisco IOS Release 15.0(1)MR.
- 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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