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Dell S3100 Command Line Reference Guide for the Series 9.112.0P2 - Page 345

ip route bfd

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Version 9.10(0.0) 9.8(2.0) 9.8(0.0P5) 9.8(0.0P2) 9.2(1.0) 9.0.0.0 8.3.19.0 8.3.10.0 7.4.1.0 Description Introduced on the S3148. Introduced on the S3100 series. Introduced on the S4048-ON. Introduced on the S3048-ON. Introduced on the Z9500. Introduced on the Z9000. Introduced on the S4820T. Introduced on the S4810. Introduced on the E-Series. Usage Information Protocol Liveness is a feature that notifies the BFD Manager when a client protocol (for example, OSPF and ISIS) is disabled. When a client is disabled, all BFD sessions for that protocol are torn down. Neighbors on the remote system receive an Admin Down control packet and are placed in the Down state. Peer routers might take corrective action by choosing alternative paths for the routes that originally pointed to this router. ip route bfd Enable BFD for all neighbors configured through static routes. Syntax ip route bfd [prefix-list prefix-list-name] [interval interval min_rx min_rx multiplier value role {active | passive}] To disable BFD for all neighbors configured through static routes, use the no ip route bfd [prefix-list prefix-list-name] [interval interval min_rx min_rx multiplier value role {active | passive}] command. Parameters prefix-list prefix-list- (Optional) Enter the keyword prefix-list followed by the name of the prefix list to name enable or disable BFD on specific neighbors. interval milliseconds (OPTIONAL) Enter the keywords interval to specify non-default BFD session parameters beginning with the transmission interval. The range is from 50 to 1000. The default is 200. min_rx milliseconds Enter the keywords min_rx to specify the minimum rate at which the local system receives control packets from the remote system. The range is from 50 to 1000. The default is 200. multiplier value Enter the keywords multiplier to specify the number of packets that must be missed in order to declare a session down. The range is from 3 to 50. The default is 3. role [active | passive] Enter the role that the local system assumes: • Active - active system initiates the BFD session. Both systems can be active for the same session. • Passive - passive system does not initiate a session. It only responds to a request for session initialization from the active system. The default is Active. Bidirectional Forwarding Detection (BFD) 345

Section	Page
Dell Command Line Reference Guide for the S3100 Series 9.11(2.0P2)	3
About this Guide	41
Objectives	41
Audience	41
Conventions	41
CLI Basics	43
Accessing the Command Line	43
Multiple Configuration Users	43
Obtaining Help	44
Navigating the CLI	45
Using the Keyword no Command	46
Filtering show Commands	46
Enabling Software Features on Devices Using a Command Option	47
feature vrf	47
show feature	48
Command Modes	49
File Management	59
boot system	59
cd	61
copy	62
delete	64
dir	65
format	67
fsck flash	67
mkdir	68
mount nfs	69
rmdir	70
upgrade system	70
rename	72
restore factory-defaults	72
show boot system	75
show bootvar	76
show file-systems	77
show os-version	78
show running-config	80
show startup-config	83
show version	85
upgrade	86
Control and Monitoring	89
banner exec	89
banner login	90
banner motd	92
cam-acl	93
cam-acl-vlan	94
clear line	95
configure	96
disable	97
do	98
enable	99
enable optic-info-update interval	100
end	101
exec-timeout	102
exit	103
ftp-server enable	104
ftp-server topdir	105
ftp-server username	106
hostname	107
ip http source-interface	108
ip http vrf	109
ip ftp password	109
ip ftp source-interface	110
ip ftp username	111
ip ftp vrf	112
ip telnet server enable	113
ip telnet server vrf	114
ip telnet source-interface	115
ip telnet vrf	116
ip tftp source-interface	117
ip tftp vrf	118
line	118
login concurrent-session	119
login statistics	121
motd-banner	122
ping	123
reload	126
send	127
service timestamps	128
show alarms	129
show cam-acl-vlan	130
show command-history	131
show cpu-traffic-stats	132
show debugging	133
show environment	134
show inventory	136
show login statistics	138
show memory	140
show processes cpu	141
show processes ipc flow-control	143
show processes memory	145
show software ifm	148
show system	149
show tech-support	153
ssh-peer-stack-unit	156
telnet	156
telnet-peer-stack-unit	158
terminal length	159
traceroute	159
undebug all	161
virtual-ip	162
write	163
802.1X	165
dot1x critical-vlan	166
debug dot1x	167
dot1x auth-fail-vlan	168
dot1x auth-server	169
dot1x auth-type mab-only	170
dot1x authentication (Configuration)	171
dot1x authentication (Interface)	171
dot1x guest-vlan	172
dot1x host-mode	173
dot1x mac-auth-bypass	174
dot1x max-eap-req	175
dot1x max-supplicants	176
dot1x port-control	177
dot1x profile	177
dot1x quiet-period	178
dot1x reauthentication	179
dot1x reauth-max	180
dot1x server-timeout	181
dot1x static-mab	182
dot1x supplicant-timeout	183
dot1x tx-period	184
mac	184
show dot1x cos-mapping interface	185
show dot1x interface	187
show dot1x profile	189
Access Control Lists (ACL)	191
Commands Common to all ACL Types	192
remark	192
show config	194
Common IP ACL Commands	195
access-class	195
clear counters ip access-group	196
ip access-group	197
ip control-plane egress-filter	198
show ip accounting access-list	199
show ip access-lists	201
Standard IP ACL Commands	201
deny	202
ip access-list standard	203
permit	205
resequence access-list	206
seq	207
Extended IP ACL Commands	209
deny	209
deny icmp	211
deny tcp	213
deny udp	216
ip access-list extended	219
permit	220
permit tcp	221
permit udp	224
resequence access-list	227
seq	228
Common MAC Access List Commands	231
clear counters mac access-group	231
mac access-group	232
show mac access-lists	233
show mac accounting access-list	234
Standard MAC ACL Commands	235
deny	235
mac access-list standard	237
permit	238
seq	239
Extended MAC ACL Commands	241
deny	241
mac access-list extended	243
permit	244
IP Prefix List Commands	246
clear ip prefix-list	246
deny	247
ip prefix-list	248
seq	249
show config	250
show ip prefix-list detail	251
show ip prefix-list summary	252
Route Map Commands	253
continue	253
description	254
match as-path	255
match community	256
match interface	257
match ip address	258
match ip next-hop	259
match ip route-source	260
match metric	261
match origin	262
match route-type	263
match tag	264
route-map	265
set as-path	266
set automatic-tag	267
set comm-list delete	268
set community	269
set level	271
set local-preference	272
set metric	273
set metric-type	274
set next-hop	275
set origin	276
set tag	277
set weight	278
show config	279
show route-map	279
AS-Path Commands	280
ip as-path access-list	281
show ip as-path-access-lists	281
IP Community List Commands	282
ip community-list	282
show ip community-lists	283
deny (for Standard IP ACLs)	284
deny (for Extended IP ACLs)	285
seq (for Standard IPv4 ACLs)	287
deny tcp (for Extended IP ACLs)	288
deny udp (for Extended IP ACLs)	289
deny arp (for Extended MAC ACLs)	291
deny icmp (for Extended IP ACLs)	292
deny ether-type (for Extended MAC ACLs)	293
deny (for Standard MAC ACLs)	295
deny (for Extended MAC ACLs)	296
permit (for Standard IP ACLs)	298
permit arp (for Extended MAC ACLs)	299
permit ether-type (for Extended MAC ACLs)	300
permit icmp (for Extended IP ACLs)	302
permit udp (for Extended IP ACLs)	303
permit (for Extended IP ACLs)	305
permit (for Standard MAC ACLs)	306
seq (for Standard MAC ACLs)	307
permit tcp (for Extended IP ACLs)	309
seq arp (for Extended MAC ACLs)	310
seq ether-type (for Extended MAC ACLs)	312
seq (for IP ACLs)	313
seq (for IPv6 ACLs)	314
permit udp (for IPv6 ACLs)	316
permit tcp (for IPv6 ACLs)	317
permit icmp (for IPv6 ACLs)	318
permit (for IPv6 ACLs)	320
deny udp (for IPv6 ACLs)	321
deny tcp (for IPv6 ACLs)	323
deny icmp (for Extended IPv6 ACLs)	324
deny (for IPv6 ACLs)	326
Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM)	328
member vlan	328
ip access-group	329
show acl-vlan-group	329
show cam-acl-vlan	331
cam-acl-vlan	332
show cam-usage	332
show running config acl-vlan-group	335
acl-vlan-group	335
show acl-vlan-group detail	336
description (ACL VLAN Group)	337
Bidirectional Forwarding Detection (BFD)	339
bfd all-neighbors	339
bfd disable	341
bfd enable (Configuration)	341
bfd enable (Interface)	342
bfd interval	343
bfd neighbor	344
bfd protocol-liveness	344
ip route bfd	345
ipv6 ospf bfd all-neighbors	346
isis bfd all-neighbors	347
neighbor bfd	348
neighbor bfd disable	349
show bfd neighbors	350
vrrp bfd neighbor	352
Border Gateway Protocol	353
BGP IPv4 Commands	353
address-family	353
aggregate-address	354
bgp add-path	356
bgp always-compare-med	357
bgp asnotation	358
bgp bestpath as-path ignore	359
bgp bestpath as-path multipath-relax	360
bgp bestpath med confed	360
bgp bestpath med missing-as-best	361
bgp bestpath router-id ignore	362
bgp client-to-client reflection	363
bgp cluster-id	363
bgp confederation identifier	364
bgp confederation peers	366
bgp connection-retry-timer	367
bgp dampening	367
bgp default local-preference	368
bgp dmzlink-bw	369
bgp enforce-first-as	370
bgp fast-external-fallover	371
bgp four-octet-as-support	372
bgp graceful-restart	373
bgp non-deterministic-med	374
bgp outbound-optimization	375
bgp outbound-optimization	376
bgp recursive-bgp-next-hop	376
bgp regex-eval-optz-disable	377
bgp router-id	378
clear ip bgp	379
clear ip bgp dampening	381
clear ip bgp flap-statistics	382
clear ip bgp peer-group	384
deny bandwidth	385
debug ip bgp	385
debug ip bgp dampening	387
debug ip bgp events	388
debug ip bgp keepalives	389
debug ip bgp notifications	390
debug ip bgp soft-reconfiguration	391
debug ip bgp updates	392
default-metric	393
description	394
maximum-paths	395
neighbor activate	396
neighbor add-path	397
neighbor advertisement-interval	398
neighbor advertisement-start	399
neighbor allowas-in	400
neighbor default-originate	401
neighbor description	402
neighbor distribute-list	403
neighbor ebgp-multihop	404
neighbor fall-over	405
neighbor local-as	406
neighbor maximum-prefix	407
neighbor next-hop-self	408
neighbor password	409
neighbor peer-group (assigning peers)	410
neighbor peer-group (creating group)	411
neighbor peer-group passive	412
neighbor remote-as	413
neighbor remove-private-as	414
neighbor route-map	415
neighbor route-reflector-client	416
neighbor sender-side-loopdetect	418
neighbor send-community	419
neighbor shutdown	420
neighbor soft-reconfiguration inbound	421
neighbor timers	422
neighbor update-source	423
neighbor weight	424
network	425
network backdoor	426
permit bandwidth	427
redistribute	428
redistribute ospf	430
router bgp	431
shutdown all	432
shutdown address-family-ipv4–multicast	432
shutdown address-family-ipv4–unicast	433
shutdown address-family-ipv6–unicast	433
set extcommunity bandwidth	434
show capture bgp-pdu neighbor	434
show config	435
show ip bgp	436
show ip bgp cluster-list	438
show ip bgp community	440
show ip bgp community-list	442
show ip bgp dampened-paths	444
show ip bgp detail	445
show ip bgp extcommunity-list	447
show ip bgp filter-list	448
show ip bgp flap-statistics	450
show ip bgp inconsistent-as	452
show ip bgp neighbors	454
show ip bgp next-hop	457
show ip bgp paths	458
show ip bgp paths community	460
show ip bgp peer-group	461
show ip bgp regexp	463
show ip bgp summary	464
show running-config bgp	467
timers bgp	468
MBGP Commands	469
debug ip bgp dampening	469
distance bgp	470
show ip bgp dampened-paths	471
BGP Extended Communities (RFC 4360)	473
set extcommunity rt	473
set extcommunity soo	474
show ip bgp paths extcommunity	475
show ip extcommunity-list	476
IPv6 BGP Commands	477
clear ip bgp ipv6 unicast soft	477
debug ip bgp ipv6 unicast soft-reconfiguration	478
ipv6 prefix-list	479
neighbor soft-reconfiguration inbound	480
show ipv6 prefix-list	481
IPv6 MBGP Commands	481
show ipv6 mbgproutes	482
Content Addressable Memory (CAM)	483
CAM Profile Commands	483
cam-acl (Configuration)	484
cam-acl-egress	487
cam-optimization	487
show cam-acl	488
show cam-usage	490
test cam-usage	491
Control Plane Policing (CoPP)	493
control-plane-cpuqos	493
service-policy rate-limit-cpu-queues	494
service-policy rate-limit-protocols	495
ip unknown-unicast	496
ipv6 unknown-unicast	496
show cpu-queue rate cp	497
show ip protocol-queue-mapping	498
show ipv6 protocol-queue-mapping	499
show mac protocol-queue-mapping	500
Debugging and Diagnostics	502
Diagnostics and Monitoring Commands	502
logging coredump stack-unit	502
Offline Diagnostic Commands	503
diag stack-unit	503
offline stack-unit	504
online stack-unit	505
Hardware Commands	506
clear hardware stack-unit	506
clear hardware system-flow	507
clear hardware vlan-counters	508
hardware watchdog	509
show hardware mac	509
show hardware ip	510
show hardware stack-unit	511
show hardware buffer interface	519
show hardware counters interface	520
show hardware buffer-stats-snapshot	522
show hardware stack-unit buffer-stats-snapshot (Total Buffer Information)	523
show hardware system-flow	524
show hardware vlan-counters	526
show hardware drops	527
Dynamic Host Configuration Protocol (DHCP)	530
Commands to Configure the System to be a DHCP Server	530
clear ip dhcp	530
debug ip dhcp server	531
debug ipv6 dhcp	532
default-router	532
disable	533
dns-server	534
domain-name	535
excluded-address	535
hardware-address	536
host	537
lease	538
netbios-name-server	539
netbios-node-type	539
network	540
pool	541
show ip dhcp binding	542
show ip dhcp configuration	542
show ip dhcp conflict	543
show ip dhcp server	544
Commands to Configure Secure DHCP	545
arp inspection	545
arp inspection-trust	546
clear ip dhcp snooping	547
clear ipv6 dhcp snooping binding	548
ip dhcp relay	548
ip dhcp snooping	550
ipv6 dhcp snooping	550
ipv6 dhcp snooping vlan	551
ip dhcp snooping binding	552
IPv6 DHCP Snooping Binding	553
ip dhcp snooping database	554
ipv6 dhcp snooping database write-delay	555
ip dhcp snooping database renew	555
ipv6 dhcp snooping database renew	556
ip dhcp snooping trust	557
ipv6 dhcp snooping trust	557
ip dhcp source-address-validation	558
ip dhcp relay information-option	559
ip dhcp snooping verify mac-address	560
ipv6 dhcp snooping verify mac-address	561
ip helper-address	561
ipv6 helper-address	562
show ip dhcp snooping	563
show ipv6 dhcp snooping	565
Commands to Configure DNS	566
ip name-server	566
ip domain-name	567
ip domain-list	568
ip host	569
clear host	570
Equal Cost Multi-Path (ECMP)	571
ecmp-group	571
hash-algorithm	572
ip ecmp-group	574
ip ecmp weighted	575
link-bundle-monitor enable	576
link-bundle-distribution trigger-threshold	577
show config	577
show link-bundle distribution	578
FIPS Cryptography	580
fips mode enable	580
show fips status	581
show ip ssh	581
ssh	583
Force10 Resilient Ring Protocol (FRRP)	586
clear frrp	586
debug frrp	588
description	589
disable	590

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918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1,000
1,001
1,002
1,003
1,004
1,005
1,006
1,007
1,008
1,009
1,010
1,011
1,012
1,013
1,014
1,015
1,016
1,017
1,018
1,019
1,020
1,021
1,022
1,023
1,024
1,025
1,026
1,027
1,028
1,029
1,030
1,031
1,032
1,033
1,034
1,035
1,036
1,037
1,038
1,039
1,040
1,041
1,042
1,043
1,044
1,045
1,046
1,047
1,048
1,049
1,050
1,051
1,052
1,053
1,054
1,055
1,056
1,057
1,058
1,059
1,060
1,061
1,062
1,063
1,064
1,065
1,066
1,067
1,068
1,069
1,070
1,071
1,072
1,073
1,074
1,075
1,076
1,077
1,078
1,079
1,080
1,081
1,082
1,083
1,084
1,085
1,086
1,087
1,088
1,089
1,090
1,091
1,092
1,093
1,094
1,095
1,096
1,097
1,098
1,099
1,100
1,101
1,102
1,103
1,104
1,105
1,106
1,107
1,108
1,109
1,110
1,111
1,112
1,113
1,114
1,115
1,116
1,117
1,118
1,119
1,120
1,121
1,122
1,123
1,124
1,125
1,126
1,127
1,128
1,129
1,130
1,131
1,132
1,133
1,134
1,135
1,136
1,137
1,138
1,139
1,140
1,141
1,142
1,143
1,144
1,145
1,146
1,147
1,148
1,149
1,150
1,151
1,152
1,153
1,154
1,155
1,156
1,157
1,158
1,159
1,160
1,161
1,162
1,163
1,164
1,165
1,166
1,167
1,168
1,169
1,170
1,171
1,172
1,173
1,174
1,175
1,176
1,177
1,178
1,179
1,180
1,181
1,182
1,183
1,184
1,185
1,186
1,187
1,188
1,189
1,190
1,191
1,192
1,193
1,194
1,195
1,196
1,197
1,198
1,199
1,200
1,201
1,202
1,203
1,204
1,205
1,206
1,207
1,208
1,209
1,210
1,211
1,212
1,213
1,214
1,215
1,216
1,217
1,218
1,219
1,220
1,221
1,222
1,223
1,224
1,225
1,226
1,227
1,228
1,229
1,230
1,231
1,232
1,233
1,234
1,235
1,236
1,237
1,238
1,239
1,240
1,241
1,242
1,243
1,244
1,245
1,246
1,247
1,248
1,249
1,250
1,251
1,252
1,253
1,254
1,255
1,256
1,257
1,258
1,259
1,260
1,261
1,262
1,263
1,264
1,265
1,266
1,267
1,268
1,269
1,270
1,271
1,272
1,273
1,274
1,275
1,276
1,277
1,278
1,279
1,280
1,281
1,282
1,283
1,284
1,285
1,286
1,287
1,288
1,289
1,290
1,291
1,292
1,293
1,294
1,295
1,296
1,297
1,298
1,299
1,300
1,301
1,302
1,303
1,304
1,305
1,306
1,307
1,308
1,309
1,310
1,311
1,312
1,313
1,314
1,315
1,316
1,317
1,318
1,319
1,320
1,321
1,322
1,323
1,324
1,325
1,326
1,327
1,328
1,329
1,330
1,331
1,332
1,333
1,334
1,335
1,336
1,337
1,338
1,339
1,340
1,341
1,342
1,343
1,344
1,345
1,346
1,347
1,348
1,349
1,350
1,351
1,352
1,353
1,354
1,355
1,356
1,357
1,358
1,359
1,360
1,361
1,362
1,363
1,364
1,365
1,366
1,367
1,368
1,369
1,370
1,371
1,372
1,373
1,374
1,375
1,376
1,377
1,378
1,379
1,380
1,381
1,382
1,383
1,384
1,385
1,386
1,387
1,388
1,389
1,390
1,391
1,392
1,393
1,394
1,395
1,396
1,397
1,398
1,399
1,400
1,401
1,402
1,403
1,404
1,405
1,406
1,407
1,408
1,409
1,410
1,411
1,412
1,413
1,414
1,415
1,416
1,417
1,418
1,419
1,420
1,421
1,422
1,423
1,424
1,425
1,426
1,427
1,428
1,429
1,430
1,431
1,432
1,433
1,434
1,435
1,436
1,437
1,438
1,439
1,440
1,441
1,442
1,443
1,444
1,445
1,446
1,447
1,448
1,449
1,450
1,451
1,452
1,453
1,454
1,455
1,456
1,457
1,458
1,459
1,460
1,461
1,462
1,463
1,464
1,465
1,466
1,467
1,468
1,469
1,470
1,471
1,472
1,473
1,474
1,475
1,476
1,477
1,478
1,479
1,480
1,481
1,482
1,483
1,484
1,485
1,486
1,487
1,488
1,489
1,490
1,491
1,492
1,493
1,494
1,495
1,496
1,497
1,498
1,499
1,500
1,501
1,502
1,503
1,504
1,505
1,506
1,507
1,508
1,509
1,510
1,511
1,512
1,513
1,514
1,515
1,516
1,517
1,518
1,519
1,520
1,521
1,522
1,523
1,524
1,525
1,526
1,527
1,528
1,529
1,530
1,531
1,532
1,533
1,534
1,535
1,536
1,537
1,538
1,539
1,540
1,541
1,542
1,543
1,544
1,545
1,546
1,547
1,548
1,549
1,550
1,551
1,552
1,553
1,554
1,555
1,556
1,557
1,558
1,559
1,560
1,561
1,562
1,563
1,564
1,565
1,566
1,567
1,568
1,569
1,570
1,571
1,572
1,573
1,574
1,575
1,576
1,577
1,578
1,579
1,580
1,581
1,582
1,583
1,584
1,585
1,586
1,587
1,588
1,589
1,590
1,591
1,592
1,593
1,594
1,595
1,596
1,597
1,598
1,599
1,600
1,601
1,602
1,603
1,604
1,605
1,606
1,607
1,608
1,609
1,610
1,611
1,612
1,613
1,614
1,615
1,616
1,617
1,618
1,619
1,620
1,621
1,622
1,623
1,624
1,625
1,626
1,627
1,628
1,629
1,630
1,631
1,632
1,633
1,634
1,635
1,636
1,637
1,638
1,639
1,640
1,641
1,642
1,643
1,644
1,645
1,646
1,647
1,648
1,649
1,650
1,651
1,652
1,653
1,654
1,655
1,656
1,657
1,658
1,659
1,660
1,661
1,662
1,663
1,664
1,665
1,666
1,667
1,668
1,669
1,670
1,671
1,672
1,673
1,674
1,675
1,676
1,677
1,678
1,679
1,680
1,681
1,682
1,683
1,684
1,685
1,686
1,687
1,688
1,689
1,690
1,691
1,692
1,693
1,694
1,695
1,696
1,697
1,698
1,699
1,700
1,701
1,702
1,703
1,704
1,705
1,706
1,707
1,708
1,709
1,710
1,711
1,712
1,713
1,714
1,715
1,716
1,717
1,718
1,719
1,720
1,721
1,722
1,723
1,724
1,725
1,726
1,727
1,728
1,729
1,730
1,731
1,732
1,733
1,734
1,735
1,736
1,737
1,738
1,739
1,740
1,741
1,742
1,743
1,744
1,745
1,746
1,747
1,748
1,749
1,750
1,751
1,752
1,753
1,754
1,755
1,756
1,757
1,758
1,759
1,760
1,761
1,762
1,763
1,764
1,765
1,766
1,767
1,768
1,769
1,770
1,771
1,772
1,773
1,774
1,775
1,776
1,777
1,778
1,779
1,780
1,781
1,782
1,783
1,784
1,785
1,786
1,787
1,788
1,789
1,790
1,791
1,792
1,793
1,794
1,795
1,796
1,797
1,798
1,799

Match case Limit results 1 per page

Version

Description

9.10(0.0)

Introduced on the S3148.

9.8(2.0)

Introduced on the S3100 series.

9.8(0.0P5)

Introduced on the S4048-ON.

9.8(0.0P2)

Introduced on the S3048-ON.

9.2(1.0)

Introduced on the Z9500.

9.0.0.0

Introduced on the Z9000.

8.3.19.0

Introduced on the S4820T.

8.3.10.0

Introduced on the S4810.

7.4.1.0

Introduced on the E-Series.

Usage Information

Protocol Liveness is a feature that

notiﬁes

the BFD Manager when a client protocol (for example, OSPF and ISIS)

is disabled. When a client is disabled, all BFD sessions for that protocol are torn down. Neighbors on the remote

system receive an Admin Down control packet and are placed in the Down state. Peer routers might take

corrective action by choosing alternative paths for the routes that originally pointed to this router.

ip route bfd

Enable BFD for all neighbors

conﬁgured

through static routes.

Syntax

ip route bfd [prefix-list

prefix-list-name

] [interval

interval

min_rx

multiplier

value

role {active | passive}]

To disable BFD for all neighbors

conﬁgured

through static routes, use the

no ip route bfd [prefix-list

prefix-list-name] [interval

interval

min_rx

multiplier

value

role

{active | passive}]

command.

Parameters

preﬁx-list

preﬁx-list-

name

(Optional) Enter the keyword

prefix-list

followed by the name of the

preﬁx

list to

enable or disable BFD on

speciﬁc

neighbors.

interval

milliseconds

(OPTIONAL) Enter the keywords

interval

to specify non-default BFD session

parameters beginning with the transmission interval. The range is from 50 to 1000. The

default is

200

min_rx

milliseconds

Enter the keywords

min_rx

to specify the minimum rate at which the local system

receives control packets from the remote system. The range is from 50 to 1000. The

default is

200

multiplier

value

Enter the keywords

multiplier

to specify the number of packets that must be missed

in order to declare a session down. The range is from 3 to 50. The default is

role [active |

passive]

Enter the role that the local system assumes:

•

Active

— active system initiates the BFD session. Both systems can be active for

the same session.

•

Passive

— passive system does not initiate a session. It only responds to a request

for session initialization from the active system.

The default is

Active

Bidirectional Forwarding Detection (BFD)

345