Home » D-Link Manuals » Wireless » D-Link DGS-3630 » Manual Viewer

D-Link DGS-3630 Emulator 1 - Page 1589

ip verify unicast source

Add to My Manuals
Save this manual to your list of manuals

Page 1589 highlights

DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide 129-2 ip verify unicast source This command is used to configure URPF on interfaces. Use the no form of this command to disable URPF checking on an interface or to revert to the default settings ip verify unicast source [reachable-via {any | rx}] [allow-default] [access-group IP-ACCESS-LIST-NAME] [ipv6-access-group IPV6-ACCESS-LIST-NAME] no ip verify unicast source [reachable-via] [allow-default] [access-group] [ipv6-access-group] Parameters reachable-via any rx allow-default access-group IP-ACCESSLIST-NAME ipv6-access-group IPV6ACCESS-LIST-NAME (Optional) Specifies the mode how URPF examines the incoming packets. (Optional) Specifies to verify if the source address is present in the routing table (sometimes referred to as the loose mode). (Optional) Specifies to verify if the source address is present in the routing table and the incoming interface matches the source and is reachable through the interface on which the packet was received (sometimes referred to as the strict mode). This is the default option. (Optional) Specifies allowing the use of the default route for URPF verification. (Optional) Specifies the name of the IPv4 ACL to be checked. (Optional) Specifies the name of the IPV6 ACL to be checked. Default By default, URPF checking is not performed. By default, the checking mode is RX. By default, allow-default is disabled. By default, no IPv4/IPv6 access list is specified. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline Unicast RPF helps to mitigate problems caused by the introduction of malformed or forged IPv4/IPv6 source addresses into a network by discarding IPv4/IPv6 packets that lack a verifiable IPv4/IPv6 source address. When Unicast RPF is effectively enabled on an interface, the Switch examines all IPv4 and IPv6 packets received as input on that interface to make sure that the source address and source interface appear in the routing table and match the interface on which the packet was received. The reverse path checking will not be performed in the following situations: • The destination IPv4/IPv6 address is not a unicast address. • The source IP address is an IPv6 address and the address is a link-local address. • The received packet is a BOOTP/DHCP packet (the source IP is 0.0.0.0 and destination IP is 255.255.255.255). 1584

Section	Page
Table of Contents	2
1. Introduction	6
Audience	6
Other Documentation	6
Conventions	6
Notes, Notices, and Cautions	6
Command Descriptions	7
Command Modes	7
User EXEC Mode at Basic User Level	8
Privileged EXEC Mode at Advanced User Level	8
Privileged EXEC Mode at Power User Level	8
Privileged EXEC Mode at Operator Level	9
Privileged EXEC Mode at Administrator Level	9
Global Configuration Mode	9
Interface Configuration Mode	9
Creating a User Account	9
Interface Notation	10
Error Messages	11
Editing Features	11
Display Result Output Modifiers	12
2. Basic CLI Commands	14
2-1 help	14
Parameters	14
Default	14
Command Mode	14
Command Default Level	14
Usage Guideline	14
Example	14
2-2 enable	15
Parameters	15
Default	15
Command Mode	16
Command Default Level	16
Usage Guideline	16
Example	16
2-3 disable	16
Parameters	16
Default	16
Command Mode	16
Command Default Level	16
Usage Guideline	16
Example	17
2-4 configure terminal	17
Parameters	17
Default	17
Command Mode	17
Command Default Level	17
Usage Guideline	17
Example	17
2-5 login (EXEC)	17
Parameters	17
Default	18
Command Mode	18
Command Default Level	18
Usage Guideline	18
Example	18
2-6 login (Line)	18
Parameters	18
Default	18
Command Mode	18
Command Default Level	18
Usage Guideline	19
Example	19
2-7 logout	20
Parameters	20
Default	20
Command Mode	20
Command Default Level	20
Usage Guideline	20
Example	20
2-8 end	20
Parameters	20
Default	20
Command Mode	20
Command Default Level	21
Usage Guideline	21
Example	21
2-9 exit	21
Parameters	21
Default	21
Command Mode	21
Command Default Level	21
Usage Guideline	21
Example	21
2-10 show history	22
Parameters	22
Default	22
Command Mode	22
Command Default Level	22
Usage Guideline	22
Example	22
2-11 password-recovery	22
Parameters	22
Default	23
Command Mode	23
Command Default Level	23
Usage Guideline	23
Example	23
2-12 show environment	23
Parameters	23
Default	24
Command Mode	24
Command Default Level	24
Usage Guideline	24
Example	24
Display Parameters	24
2-13 show unit	24
Parameters	25
Default	25
Command Mode	25
Command Default Level	25
Usage Guideline	25
Example	25
2-14 show cpu utilization	25
Parameters	25
Default	26
Command Mode	26
Command Default Level	26
Usage Guideline	26
Example	26
2-15 show version	26
Parameters	27
Default	27
Command Mode	27
Command Default Level	27
Usage Guideline	27
Example	27
2-16 snmp-server enable traps environment	27
Parameters	27
Default	28
Command Mode	28
Command Default Level	28
Usage Guideline	28
Example	28
2-17 environment temperature threshold	28
Parameters	28
Default	28
Command Mode	28
Command Default Level	28
Usage Guideline	29
Example	29
2-18 show memory utilization	29
Parameters	29
Default	29
Command Mode	29
Command Default Level	29
Usage Guideline	29
Example	30
2-19 console-usb-timeout	30
Parameters	30
Default	30
Command Mode	30
Command Default Level	30
Usage Guideline	30
Example	31
2-20 console-usb	31
Parameters	31
Default	31
Command Mode	31
Command Default Level	31
Usage Guideline	31
Example	31
2-21 privilege	31
Parameters	32
Default	32
Command Mode	32
Command Default Level	32
Usage Guideline	32
Example	32
2-22 show privilege	32
Parameters	32
Default	32
Command Mode	32
Command Default Level	32
Usage Guideline	33
Example	33
3. 802.1X Commands	34
3-1 clear dot1x counters	34
Parameters	34
Default	34
Command Mode	34
Command Default Level	34
Usage Guideline	34
Example	34
3-2 dot1x control-direction	34
Parameters	34
Default	35
Command Mode	35
Command Default Level	35
Usage Guideline	35
Example	35
3-3 dot1x default	35
Parameters	35
Default	35
Command Mode	36
Command Default Level	36
Usage Guideline	36
Example	36
3-4 dot1x port-control	36
Parameters	36
Default	36
Command Mode	36
Command Default Level	36
Usage Guideline	36
Example	37
3-5 dot1x forward-pdu	37
Parameters	37
Default	37
Command Mode	37
Command Default Level	37
Usage Guideline	37
Example	37
3-6 dot1x initialize	37
Parameters	38
Default	38
Command Mode	38
Command Default Level	38
Usage Guideline	38
Example	38
3-7 dot1x max-req	38
Parameters	38
Default	38
Command Mode	39
Command Default Level	39
Usage Guideline	39
Example	39
3-8 dot1x pae authenticator	39
Parameters	39
Default	39
Command Mode	39
Command Default Level	39
Usage Guideline	39
Example	40
3-9 dot1x re-authenticate	40
Parameters	40
Default	40
Command Mode	40
Command Default Level	40
Usage Guideline	40
Example	41
3-10 dot1x system-auth-control	41
Parameters	41
Default	41
Command Mode	41
Command Default Level	41
Usage Guideline	41
Example	41
3-11 dot1x timeout	41
Parameters	42
Default	42
Command Mode	42
Command Default Level	42
Usage Guideline	42
Example	42
3-12 show dot1x	42
Parameters	42
Default	43
Command Mode	43
Command Default Level	43
Usage Guideline	43
Example	43
3-13 show dot1x diagnostics	43
Parameters	44
Default	44
Command Mode	44
Command Default Level	44
Usage Guideline	44
Example	44
3-14 show dot1x statistics	45
Parameters	45
Default	45
Command Mode	45
Command Default Level	45
Usage Guideline	45
Example	45
3-15 show dot1x session-statistics	46
Parameters	46
Default	46
Command Mode	46
Command Default Level	46
Usage Guideline	46
Example	46
3-16 snmp-server enable traps dot1x	46
Parameters	47
Default	47
Command Mode	47
Command Default Level	47
Usage Guideline	47
Example	47
4. Access Control List (ACL) Commands	48
4-1 access-list resequence	48
Parameters	48
Default	48
Command Mode	48
Command Default Level	48
Usage Guideline	48
Example	49
4-2 acl-hardware-counter	49
Parameters	49
Default	50
Command Mode	50
Command Default Level	50
Usage Guideline	50
Example	50
4-3 action	50
Parameters	50
Default	50
Command Mode	50
Command Default Level	50
Usage Guideline	51
Example	51
4-4 clear acl-hardware-counter	51
Parameters	51
Default	51
Command Mode	51
Command Default Level	51
Usage Guideline	52
Example	52
4-5 expert access-group	52
Parameters	52
Default	52
Command Mode	52
Command Default Level	52
Usage Guideline	52
Example	53
4-6 expert access-list	53
Parameters	53
Default	53
Command Mode	53
Command Default Level	53
Usage Guideline	53
Example	53
4-7 ip access-group	54
Parameters	54
Default	54
Command Mode	54
Command Default Level	54
Usage Guideline	54
Example	54
4-8 ip access-list	54
Parameters	55
Default	55
Command Mode	55
Command Default Level	55
Usage Guideline	55
Example	55
4-9 ipv6 access-group	55
Parameters	56
Default	56
Command Mode	56
Command Default Level	56
Usage Guideline	56
Example	56
4-10 ipv6 access-list	56
Parameters	56
Default	57
Command Mode	57
Command Default Level	57
Usage Guideline	57
Example	57
4-11 list-remark	57
Parameters	57
Default	57
Command Mode	58
Command Default Level	58
Usage Guideline	58
Example	58
4-12 mac access-group	58
Parameters	58
Default	58
Command Mode	58
Command Default Level	59
Usage Guideline	59
Example	59
4-13 mac access-list	59
Parameters	59
Default	59
Command Mode	59
Command Default Level	59
Usage Guideline	59
Example	60
4-14 match ip address	60
Parameters	60
Default	60
Command Mode	60
Command Default Level	60
Usage Guideline	60
Example	61
4-15 match ipv6 address	61
Parameters	61
Default	61
Command Mode	61
Command Default Level	61
Usage Guideline	61
Example	62
4-16 match mac address	62
Parameters	62
Default	62
Command Mode	62
Command Default Level	62
Usage Guideline	62
Example	63
4-17 permit \| deny \| deny-cpu (expert access-list)	63
Parameters	63
Default	65
Command Mode	65
Command Default Level	65
Usage Guideline	65
Example	66
4-18 permit \| deny \| deny-cpu (ip access-list)	66
Parameters	66
Default	68
Command Mode	68
Command Default Level	68
Usage Guideline	68
Example	68
4-19 permit \| deny \| deny-cpu (ipv6 access-list)	69
Parameters	69
Default	70
Command Mode	70
Command Default Level	70
Usage Guideline	71
Example	71
4-20 permit \| deny \| deny-cpu (mac access-list)	71
Parameters	71
Default	72
Command Mode	72
Command Default Level	72
Usage Guideline	72
Example	73
4-21 show access-group	73
Parameters	73
Default	73
Command Mode	73
Command Default Level	73
Usage Guideline	73
Example	73
4-22 show access-list	73
Parameters	74
Default	74
Command Mode	74
Command Default Level	74
Usage Guideline	74
Example	74
4-23 show vlan access-map	75
Parameters	75
Default	75
Command Mode	75
Command Default Level	75
Usage Guideline	75
Example	76
4-24 show vlan filter	76
Parameters	76
Default	76
Command Mode	76
Command Default Level	76
Usage Guideline	77
Example	77
4-25 vlan access-map	77
Parameters	77
Default	77
Command Mode	77
Command Default Level	77
Usage Guideline	77
Example	78
4-26 vlan filter	78
Parameters	78
Default	78
Command Mode	78
Command Default Level	78
Usage Guideline	78
Example	78
5. Access Management Commands	79
5-1 access class	79
Parameters	79
Default	79
Command Mode	79
Command Default Level	79
Usage Guideline	79
Example	79
5-2 banner login	79
Parameters	80
Default	80
Command Mode	80
Command Default Level	80
Usage Guideline	80
Example	80
5-3 do	80
Parameters	81
Default	81
Command Mode	81
Command Default Level	81
Usage Guideline	81
Example	81
5-4 prompt	81
Parameters	81
Default	81
Command Mode	82
Command Default Level	82
Usage Guideline	82

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
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

Match case Limit results 1 per page

DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide

1584

129-2

ip verify unicast source

This command is used to configure URPF on interfaces. Use the

form of this command to disable URPF

checking on an interface or to revert to the default settings

ip verify unicast source [reachable-via {any | rx}] [allow-default] [access-group

IP-ACCESS-LIST-NAME

]

[ipv6-access-group

IPV6-ACCESS-LIST-NAME

]

no ip verify unicast source [reachable-via] [allow-default] [access-group] [ipv6-access-group]

Parameters

reachable-via

(Optional) Specifies the mode how URPF examines the incoming packets.

any

(Optional) Specifies to verify if the source address is present in the routing table

(sometimes referred to as the loose mode).

(Optional) Specifies to verify if the source address is present in the routing table

and the incoming interface matches the source and is reachable through the

interface on which the packet was received (sometimes referred to as the strict

mode). This is the default option.

allow-default

(Optional) Specifies allowing the use of the default route for URPF verification.

access-group

IP-ACCESS-

LIST-NAME

(Optional) Specifies the name of the IPv4 ACL to be checked.

ipv6-access-group

IPV6-

ACCESS-LIST-NAME

(Optional) Specifies the name of the IPV6 ACL to be checked.

Default

By default, URPF checking is not performed.

By default, the checking mode is RX.

By default,

allow-default

is disabled.

By default, no IPv4/IPv6 access list is specified.

Command Mode

Interface Configuration Mode.

Command Default Level

Level: 12.

Usage Guideline

Unicast RPF helps to mitigate problems caused by the introduction of malformed or forged IPv4/IPv6 source

addresses into a network by discarding IPv4/IPv6 packets that lack a verifiable IPv4/IPv6 source address.

When Unicast RPF is effectively enabled on an interface, the Switch examines all IPv4 and IPv6 packets received

as input on that interface to make sure that the source address and source interface appear in the routing table

and match the interface on which the packet was received.

The reverse path checking will not be performed in the following situations:

•

The destination IPv4/IPv6 address is not a unicast address.

•

The source IP address is an IPv6 address and the address is a link-local address.

•

The received packet is a BOOTP/DHCP packet (the source IP is 0.0.0.0 and destination IP is

255.255.255.255).