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Dell S3100 Command Line Reference Guide for the Series 9.100.1 - Page 763

Verison, Description, Command Modes, Command History

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Command Modes INTERFACE (Gigabit Ethernet and 10-Gigabit Ethernet interfaces) Command History This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking OS Command Line Reference Guide. Verison 9.10(0.0) 9.8(2.0) 9.8(0.0P5) 9.8(0.0P2) 9.2(1.0) 8.3.19.0 8.3.7.0 8.1.1.0 6.1.1.0 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 S4820T. Introduced on the S4810. Introduced on the E-Series. Introduced on the E-Series. Usage Information When you enter the no mtu command, Dell Networking OS reduces the ip mtu value to 1536 bytes. To return the IP MTU value to the default, use the no ip mtu command. Starting with Dell Networking OS Release 9.2(0.2), the ip mtu command is not supported to configure the IP MTU value that is used when the IP packet is fragmented. Instead of having to configure the IP MTU value, this value is automatically computed by the software when you configure an interface. As a result, the ip mtu command is not available for configuration. However, you can continue to specify the link MTU value by using the mtu command. Compensate for Layer 2 header when configuring link MTU on an Ethernet interface or Dell Networking OS may not fragment packets. If the packet includes a Layer 2 header, the difference between the link MTU and IP MTU (the ip mtu command) must be enough bytes to include for the Layer 2 header. Link MTU and IP MTU considerations for Port Channels and VLANs are as follows Port Channels: • All members must have the same link MTU value and the same IP MTU value. • The Port Channel link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the channel members. For example, if the members have a link MTU of 2100 and an IP MTU 2000, the Port Channel's MTU values cannot be higher than 2100 for link MTU or 2000 bytes for IP MTU. VLANs: • All members of a VLAN must have same IP MTU value. • Members can have different Link MTU values. Tagged members must have a link MTU 4 bytes higher than untagged members to account for the packet tag. • The VLAN link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values configured on the VLAN members. For example, the VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged members with Link MTU of 1518 and IP MTU of 1500. The VLAN's Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes. The following describes the difference between Link MTU and IP MTU. IPv4 Routing 763

Section	Page
Dell Command Line Reference Guide for the S3100 Series 9.10(0.1)	3
About this Guide	39
Objectives	39
Audience	39
Conventions	39
CLI Basics	40
Accessing the Command Line	40
Multiple Configuration Users	40
Obtaining Help	41
Navigating the CLI	42
Using the Keyword no Command	43
Filtering show Commands	43
Enabling Software Features on Devices Using a Command Option	44
feature vrf	44
show feature	45
Command Modes	46
File Management	55
boot system	55
cd	57
copy	57
delete	60
dir	61
format	62
fsck flash	63
mkdir	64
mount nfs	64
rmdir	65
upgrade system	65
rename	67
restore factory-defaults	68
show boot system	70
show bootvar	71
show file-systems	72
show os-version	73
show running-config	75
show startup-config	78
show version	80
upgrade	81
Control and Monitoring	84
banner exec	84
banner login	85
banner motd	87
cam-acl	88
cam-acl-vlan	89
clear line	90
configure	91
disable	92
do	93
enable	94
enable optic-info-update interval	95
end	95
exec-timeout	96
exit	97
ftp-server enable	98
ftp-server topdir	100
ftp-server username	101
hostname	102
ip http source-interface	102
ip http vrf	103
ip ftp password	104
ip ftp source-interface	105
ip ftp username	106
ip ftp vrf	107
ip telnet server enable	108
ip telnet server vrf	108
ip telnet source-interface	109
ip telnet vrf	110
ip tftp source-interface	111
ip tftp vrf	112
line	113
login concurrent-session	114
login statistics	115
motd-banner	117
ping	118
reload	121
send	122
service timestamps	123
show alarms	124
show cam-acl-vlan	125
show command-history	125
show cpu-traffic-stats	127
show debugging	128
show environment	129
show inventory	130
show login statistics	132
show memory	134
show processes cpu	135
show processes ipc flow-control	138
show processes memory	139
show software ifm	142
show system	143
show tech-support	147
ssh-peer-stack-unit	150
telnet	150
telnet-peer-stack-unit	152
terminal length	153
traceroute	153
undebug all	155
virtual-ip	156
write	157
802.1X	159
dot1x critical-vlan	160
debug dot1x	161
dot1x auth-fail-vlan	162
dot1x auth-server	163
dot1x auth-type mab-only	163
dot1x authentication (Configuration)	164
dot1x authentication (Interface)	165
dot1x guest-vlan	166
dot1x host-mode	167
dot1x mac-auth-bypass	168
dot1x max-eap-req	169
dot1x max-supplicants	169
dot1x port-control	170
dot1x profile	171
dot1x quiet-period	172
dot1x reauthentication	172
dot1x reauth-max	173
dot1x server-timeout	174
dot1x static-mab	175
dot1x supplicant-timeout	176
dot1x tx-period	177
mac	178
show dot1x cos-mapping interface	179
show dot1x interface	180
show dot1x profile	182
Access Control Lists (ACL)	184
Commands Common to all ACL Types	185
remark	185
show config	186
Common IP ACL Commands	187
access-class	188
clear counters ip access-group	189
ip access-group	190
ip control-plane egress-filter	191
show ip accounting access-list	192
show ip access-lists	193
Standard IP ACL Commands	194
deny	194
ip access-list standard	196
permit	197
resequence access-list	198
seq	199
Extended IP ACL Commands	201
deny	201
deny icmp	203
deny tcp	205
deny udp	207
ip access-list extended	210
permit	211
permit tcp	212
permit udp	215
resequence access-list	217
seq	218
Common MAC Access List Commands	221
clear counters mac access-group	221
mac access-group	222
show mac access-lists	223
show mac accounting access-list	224
Standard MAC ACL Commands	225
deny	225
mac access-list standard	227
permit	228
seq	229
Extended MAC ACL Commands	231
deny	231
mac access-list extended	233
permit	234
IP Prefix List Commands	236
clear ip prefix-list	236
deny	237
ip prefix-list	238
seq	239
show config	240
show ip prefix-list detail	241
show ip prefix-list summary	242
Route Map Commands	243
continue	243
description	244
match as-path	245
match community	246
match interface	247
match ip address	248
match ip next-hop	249
match ip route-source	250
match metric	251
match origin	252
match route-type	253
match tag	254
route-map	255
set as-path	256
set automatic-tag	257
set comm-list delete	258
set community	259
set level	260
set local-preference	261
set metric	262
set metric-type	263
set next-hop	264
set origin	265
set tag	266
set weight	267
show config	268
show route-map	269
AS-Path Commands	270
ip as-path access-list	270
show ip as-path-access-lists	271
IP Community List Commands	271
ip community-list	271
show ip community-lists	272
deny (for Standard IP ACLs)	273
deny (for Extended IP ACLs)	274
seq (for Standard IPv4 ACLs)	276
deny tcp (for Extended IP ACLs)	277
deny udp (for Extended IP ACLs)	279
deny arp (for Extended MAC ACLs)	280
deny icmp (for Extended IP ACLs)	281
deny ether-type (for Extended MAC ACLs)	282
deny (for Standard MAC ACLs)	284
deny (for Extended MAC ACLs)	285
permit (for Standard IP ACLs)	287
permit arp (for Extended MAC ACLs)	288
permit ether-type (for Extended MAC ACLs)	289
permit icmp (for Extended IP ACLs)	291
permit udp (for Extended IP ACLs)	292
permit (for Extended IP ACLs)	294
permit (for Standard MAC ACLs)	295
seq (for Standard MAC ACLs)	296
permit tcp (for Extended IP ACLs)	298
seq arp (for Extended MAC ACLs)	299
seq ether-type (for Extended MAC ACLs)	301
seq (for IP ACLs)	302
seq (for IPv6 ACLs)	303
permit udp (for IPv6 ACLs)	305
permit tcp (for IPv6 ACLs)	306
permit icmp (for IPv6 ACLs)	307
permit (for IPv6 ACLs)	309
deny udp (for IPv6 ACLs)	310
deny tcp (for IPv6 ACLs)	312
deny icmp (for Extended IPv6 ACLs)	313
deny (for IPv6 ACLs)	314
Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM)	317
member vlan	317
ip access-group	318
show acl-vlan-group	318
show cam-acl-vlan	319
cam-acl-vlan	321
show cam-usage	321
show running config acl-vlan-group	324
acl-vlan-group	324
show acl-vlan-group detail	325
description (ACL VLAN Group)	326
Bidirectional Forwarding Detection (BFD)	328
bfd all-neighbors	328
bfd disable	330
bfd enable (Configuration)	330
bfd enable (Interface)	331
bfd interval	332
bfd neighbor	333
bfd protocol-liveness	333
ip route bfd	334
ipv6 ospf bfd all-neighbors	335
isis bfd all-neighbors	336
neighbor bfd	337
neighbor bfd disable	338
show bfd neighbors	339
vrrp bfd neighbor	341
Border Gateway Protocol	342
BGP IPv4 Commands	342
address-family	342
aggregate-address	343
bgp add-path	345
bgp always-compare-med	346
bgp asnotation	347
bgp bestpath as-path ignore	348
bgp bestpath as-path multipath-relax	349
bgp bestpath med confed	349
bgp bestpath med missing-as-best	350
bgp bestpath router-id ignore	351
bgp client-to-client reflection	352
bgp cluster-id	352
bgp confederation identifier	353
bgp confederation peers	355
bgp connection-retry-timer	356
bgp dampening	356
bgp default local-preference	357
bgp dmzlink-bw	358
bgp enforce-first-as	359
bgp fast-external-fallover	360
bgp four-octet-as-support	361
bgp graceful-restart	362
bgp non-deterministic-med	363
bgp recursive-bgp-next-hop	364
bgp regex-eval-optz-disable	365
bgp router-id	366
clear ip bgp	367
clear ip bgp dampening	368
clear ip bgp flap-statistics	370
clear ip bgp peer-group	371
deny bandwidth	372
debug ip bgp	373
debug ip bgp dampening	374
debug ip bgp events	375
debug ip bgp keepalives	376
debug ip bgp notifications	377
debug ip bgp soft-reconfiguration	378
debug ip bgp updates	379
default-metric	381
description	382
maximum-paths	382
neighbor activate	383
neighbor add-path	384
neighbor advertisement-interval	385
neighbor advertisement-start	386
neighbor allowas-in	387
neighbor default-originate	388
neighbor description	389
neighbor distribute-list	390
neighbor ebgp-multihop	391
neighbor fall-over	392
neighbor local-as	393
neighbor maximum-prefix	394
neighbor next-hop-self	395
neighbor password	396
neighbor peer-group (assigning peers)	397
neighbor peer-group (creating group)	398
neighbor peer-group passive	399
neighbor remote-as	400
neighbor remove-private-as	401
neighbor route-map	402
neighbor route-reflector-client	403
neighbor sender-side-loopdetect	404
neighbor send-community	405
neighbor shutdown	406
neighbor soft-reconfiguration inbound	407
neighbor timers	408
neighbor update-source	410
neighbor weight	411
network	412
network backdoor	413
permit bandwidth	414
redistribute	415
redistribute ospf	416
router bgp	417
set extcommunity bandwidth	418
show capture bgp-pdu neighbor	419
show config	420
show ip bgp	421
show ip bgp cluster-list	423
show ip bgp community	425
show ip bgp community-list	427
show ip bgp dampened-paths	429
show ip bgp detail	430
show ip bgp extcommunity-list	432
show ip bgp filter-list	433
show ip bgp flap-statistics	435
show ip bgp inconsistent-as	437
show ip bgp neighbors	438
show ip bgp next-hop	442
show ip bgp paths	443
show ip bgp paths community	445
show ip bgp peer-group	446
show ip bgp regexp	448
show ip bgp summary	449
show running-config bgp	452
timers bgp	453
MBGP Commands	454
debug ip bgp dampening	454
distance bgp	455
show ip bgp dampened-paths	456
BGP Extended Communities (RFC 4360)	457
set extcommunity rt	458
set extcommunity soo	459
show ip bgp paths extcommunity	460
show ip extcommunity-list	461
IPv6 BGP Commands	462
clear ip bgp ipv6 unicast soft	462
debug ip bgp ipv6 unicast soft-reconfiguration	463
ipv6 prefix-list	464
neighbor soft-reconfiguration inbound	464
show ipv6 prefix-list	465
IPv6 MBGP Commands	466
show ipv6 mbgproutes	466
Content Addressable Memory (CAM)	468
CAM Profile Commands	468
cam-acl (Configuration)	469
cam-acl-egress	472
cam-optimization	472
show cam-acl	473
test cam-usage	475
Control Plane Policing (CoPP)	477
control-plane-cpuqos	477
service-policy rate-limit-cpu-queues	478
service-policy rate-limit-protocols	479
ip unknown-unicast	480
ipv6 unknown-unicast	480
show cpu-queue rate cp	481
show ip protocol-queue-mapping	482
show ipv6 protocol-queue-mapping	483
show mac protocol-queue-mapping	484
Debugging and Diagnostics	485
Diagnostics and Monitoring Commands	485
logging coredump stack-unit	485
Offline Diagnostic Commands	486
diag stack-unit	486
offline stack-unit	487
online stack-unit	488
Hardware Commands	489
clear hardware stack-unit	489
clear hardware system-flow	490
clear hardware vlan-counters	491
hardware watchdog	492
show hardware mac	492
show hardware ip	493
show hardware stack-unit	494
show hardware buffer interface	502
show hardware counters interface	503
show hardware buffer-stats-snapshot	505
show hardware stack-unit buffer-stats-snapshot (Total Buffer Information)	506
show hardware system-flow	508
show hardware vlan-counters	510
show hardware drops	510
Dynamic Host Configuration Protocol (DHCP)	513
Commands to Configure the System to be a DHCP Server	513
clear ip dhcp	513
debug ip dhcp server	514
debug ipv6 dhcp	515
default-router	515
disable	516
dns-server	517
domain-name	518
excluded-address	518
hardware-address	519
host	520
lease	521
netbios-name-server	521
netbios-node-type	522
network	523
pool	524
show ip dhcp binding	525
show ip dhcp configuration	525
show ip dhcp conflict	526
show ip dhcp server	527
Commands to Configure Secure DHCP	528
arp inspection	528
arp inspection-trust	529
clear ip dhcp snooping	529
clear ipv6 dhcp snooping binding	531
ip dhcp relay	531
ip dhcp snooping	532
ipv6 dhcp snooping	533
ipv6 dhcp snooping vlan	533
ip dhcp snooping binding	534
IPv6 DHCP Snooping Binding	535
ip dhcp snooping database	536
ipv6 dhcp snooping database write-delay	537
ip dhcp snooping database renew	537
ipv6 dhcp snooping database renew	538
ip dhcp snooping trust	539
ipv6 dhcp snooping trust	539
ip dhcp source-address-validation	540
ip dhcp relay information-option	541
ip dhcp snooping verify mac-address	542
ipv6 dhcp snooping verify mac-address	542
ip helper-address	543
ipv6 helper-address	544
show ip dhcp snooping	544
show ipv6 dhcp snooping	547
Commands to Configure DNS	547
ip name-server	547
ip domain-name	548
ip domain-list	549
ip host	550
clear host	551
Equal Cost Multi-Path (ECMP)	553
ecmp-group	553
hash-algorithm	554
ip ecmp-group	556
ip ecmp weighted	557
link-bundle-monitor enable	558
link-bundle-distribution trigger-threshold	558
show config	559
show link-bundle distribution	560
FIPS Cryptography	561
fips mode enable	561
show fips status	562
show ip ssh	562
ssh	564
Force10 Resilient Ring Protocol (FRRP)	567
clear frrp	567
debug frrp	569
description	570
disable	571
interface	571
member-vlan	573
mode	574
protocol frrp	575
show frrp	576
timer	577
GARP VLAN Registration (GVRP)	579

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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

Match case Limit results 1 per page

Command Modes

INTERFACE (Gigabit Ethernet and 10-Gigabit Ethernet interfaces)

Command History

This guide is platform-specific. For command information about other platforms, see the relevant

Dell

Networking OS Command Line Reference Guide

Verison

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.

8.3.19.0

Introduced on the S4820T.

8.3.7.0

Introduced on the S4810.

8.1.1.0

Introduced on the E-Series.

6.1.1.0

Introduced on the E-Series.

Usage Information

When you enter the

no mtu

command, Dell Networking OS reduces the ip mtu value to 1536 bytes. To

return the IP MTU value to the default, use the

no ip mtu

command.

Starting with Dell Networking OS Release 9.2(0.2), the

ip mtu

command is not supported to configure

the IP MTU value that is used when the IP packet is fragmented. Instead of having to configure the IP

MTU value, this value is automatically computed by the software when you configure an interface. As a

result, the ip mtu command is not available for configuration. However, you can continue to specify the

link MTU value by using the mtu command.

Compensate for Layer 2 header when configuring link MTU on an Ethernet interface or Dell Networking

OS may not fragment packets. If the packet includes a Layer 2 header, the difference between the link

MTU and IP MTU (the

ip mtu

command) must be enough bytes to include for the Layer 2 header.

Link MTU and IP MTU considerations for Port Channels and VLANs are as follows

Port Channels:

•

All members must have the same link MTU value and the same IP MTU value.

•

The Port Channel link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values

configured on the channel members. For example, if the members have a link MTU of 2100 and an IP

MTU 2000, the Port Channel’s MTU values cannot be higher than 2100 for link MTU or 2000 bytes for

IP MTU.

VLANs:

•

All members of a VLAN must have same IP MTU value.

•

Members can have different Link MTU values. Tagged members must have a link MTU 4 bytes higher

than untagged members to account for the packet tag.

•

The VLAN link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values

configured on the VLAN members. For example, the VLAN contains tagged members with Link MTU

of 1522 and IP MTU of 1500 and untagged members with Link MTU of 1518 and IP MTU of 1500. The

VLAN’s Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes.

The following describes the difference between Link MTU and IP MTU.

IPv4 Routing

763