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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
keepalive
Usage Guidelines Keepalive Time Interval
You can configure the keepalive time interval, which is the frequency at which the Cisco IOS software
sends messages to itself (Ethernet and Token Ring) or to the other end (serial and tunnel), to ensure that
a network interface is alive. The interval is adjustable in 1-second increments, down to a minimum of
1 second. An interface is declared down after three update intervals have passed without receiving a
keepalive packet unless the retry value is set higher.
Setting the keepalive timer to a low value is useful for quickly detecting Ethernet interface failures (such
as a transceiver cable disconnecting, or cable that is not terminated).
Line Failure
A typical serial line failure involves losing the Carrier Detect (CD) signal. Because this sort of failure is
typically noticed within a few milliseconds, adjusting the keepalive timer for quicker routing recovery
is generally not useful.
Keepalive Packets with Tunnel Interfaces
GRE keepalive packets may be sent either from both sides of a tunnel or from just one side. If they are
sent from both sides, the period and retries arguments can be different at each side of the link. If you
configure keepalives on only one side of the tunnel, the tunnel interface on the sending side might
perceive the tunnel interface on the receiving side to be down because the sending interface is not
receiving keepalives. From the receiving side of the tunnel, the link appears normal because no
keepalives were enabled on the second side of the link.
Dropped Packets
Because keepalive packets are treated as ordinary packets, it is possible that they will be dropped. To
reduce the possibility that dropped keepalive packets will cause the tunnel interface to be taken down,
increase the number of retries.
Note When adjusting the keepalive timer for a very-low-bandwidth serial interface, large datagrams can delay
the smaller keepalive packets long enough to cause the line protocol to go down. You may need to
experiment to determine the best values to use for the timeout and the number of retry attempts.
Examples The following example shows how to set the keepalive interval to 3 seconds:
Router(config)# interface ethernet 0
Router(config-if)# keepalive 3
The following example shows how to set the keepalive interval to 3 seconds and the retry value to 7:
Router(config)# interface tunnel 1
Router(config-if)# keepalive 3 7
12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support
in a specific 12.2SX release of this train depends on your feature set,
platform, and platform hardware.
12.4(19)MR2 This command was integrated into Cisco IOS Release 12.4(19)MR2.
12.2(33)MRA This command was integrated into Cisco IOS Release 12.2(33)MRA.
15.0(1)MR This command was integrated into Cisco IOS Release 15.0(1)MR.
Release Modification
- 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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