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Dell S3100 Command Line Reference Guide for the Series 9.82.0 - Page 857

Verison, Description, Layer 2, Overhead, Difference between Link MTU and IP MTU

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Verison 6.1.1.0 Description 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. Layer 2 Overhead Ethernet (untagged) VLAN Tag Untagged Packet with VLAN-Stack Header Difference between Link MTU and IP MTU 18 bytes Tag 22 bytes 22 bytes IPv4 Routing 857

Section	Page
Dell Command Line Reference Guide for the S3100 Series 9.8(2.0)	3
About this Guide	43
Objectives	43
Audience	43
Conventions	43
CLI Basics	45
Accessing the Command Line	45
Multiple Configuration Users	45
Obtaining Help	46
Navigating the CLI	48
Using the Keyword no Command	48
Filtering show Commands	48
Enabling Software Features on Devices Using a Command Option	49
feature vrf	50
show feature	51
Command Modes	51
File Management	61
boot system	61
cd	63
copy	63
delete	66
dir	68
format	69
fsck flash	70
mkdir	71
mount nfs	72
rmdir	72
upgrade system	73
rename	75
restore factory-defaults	75
show boot system	79
show bootvar	80
show file-systems	81
show os-version	82
show running-config	84
show startup-config	88
show version	89
upgrade	91
Control and Monitoring	93
banner exec	93
banner login	94
banner motd	96
cam-acl	97
cam-acl-vlan	99
clear line	101
configure	102
disable	103
do	104
enable	105
enable optic-info-update interval	106
end	107
exec-timeout	108
exit	109
ftp-server enable	111
ftp-server topdir	112
ftp-server username	113
hostname	114
ip http source-interface	115
ip http vrf	116
ip ftp password	116
ip ftp source-interface	117
ip ftp username	119
ip ftp vrf	120
ip telnet server enable	121
ip telnet server vrf	121
ip telnet source-interface	122
ip telnet vrf	124
ip tftp source-interface	125
ip tftp vrf	126
line	127
login concurrent-session	128
login statistics	130
motd-banner	131
ping	132
reload	136
send	137
service timestamps	138
show alarms	139
show cam-acl-vlan	141
show command-history	141
show command-tree	143
show cpu-traffic-stats	144
show debugging	146
show environment	147
show inventory	149
show login statistics	150
show memory	153
show processes cpu	154
show processes ipc flow-control	158
show processes memory	160
show software ifm	163
show system	164
show tech-support	168
ssh-peer-stack-unit	171
telnet	172
telnet-peer-stack-unit	174
terminal length	174
traceroute	175
undebug all	177
virtual-ip	178
write	179
802.1ag	181
ccm disable	181
ccm transmit-interval	181
clear ethernet cfm traceroute-cache	182
database hold-time	183
disable	183
domain	184
ethernet cfm	184
ethernet cfm mep	185
ethernet cfm mip	186
mep cross-check	187
mep cross-check enable	187
mep cross-check start-delay	188
ping ethernet	189
show ethernet cfm domain	189
show ethernet cfm maintenance-points local	190
show ethernet cfm maintenance-points remote	191
show ethernet cfm mipbd	192
show ethernet cfm statistics	193
show ethernet cfm port-statistics	194
show ethernet cfm traceroute-cache	195
service	196
traceroute cache hold-time	196
traceroute cache size	197
traceroute ethernet	198
802.1X	199
debug dot1x	200
dot1x auth-fail-vlan	200
dot1x auth-server	202
dot1x auth-type mab-only	202
dot1x authentication (Configuration)	203
dot1x authentication (Interface)	204
dot1x guest-vlan	205
dot1x host-mode	206
dot1x mac-auth-bypass	207
dot1x max-eap-req	208
dot1x max-supplicants	209
dot1x port-control	210
dot1x quiet-period	211
dot1x reauthentication	212
dot1x reauth-max	212
dot1x server-timeout	213
dot1x supplicant-timeout	214
dot1x tx-period	215
show dot1x cos-mapping interface	216
show dot1x interface	218
Access Control Lists (ACL)	221
Commands Common to all ACL Types	221
remark	221
show config	223
Common IP ACL Commands	224
access-class	224
clear counters ip access-group	225
ip access-group	226
ip control-plane egress-filter	228
show ip accounting access-list	228
show ip access-lists	230
Standard IP ACL Commands	231
deny	231
ip access-list standard	233
permit	234
resequence access-list	236
seq	237
Extended IP ACL Commands	239
deny	240
deny icmp	242
deny tcp	244
deny udp	247
ip access-list extended	250
permit	251
permit tcp	253
permit udp	257
resequence access-list	260
seq	261
Common MAC Access List Commands	264
clear counters mac access-group	264
mac access-group	265
show mac access-lists	267
show mac accounting access-list	268
Standard MAC ACL Commands	269
deny	269
mac access-list standard	271
permit	272
seq	274
Extended MAC ACL Commands	276
deny	276
mac access-list extended	278
permit	280
IP Prefix List Commands	282
clear ip prefix-list	282
deny	283
ip prefix-list	284
seq	285
show config	286
show ip prefix-list detail	287
show ip prefix-list summary	288
Route Map Commands	289
continue	289
description	291
match as-path	292
match community	293
match interface	293
match ip address	295
match ip next-hop	296
match ip route-source	297
match metric	298
match origin	299
match route-type	300
match tag	301
route-map	302
set as-path	303
set automatic-tag	304
set comm-list delete	305
set community	306
set level	308
set local-preference	309
set metric	310
set metric-type	311
set next-hop	312
set origin	313
set tag	314
set weight	315
show config	316
show route-map	317
AS-Path Commands	318
ip as-path access-list	318
show ip as-path-access-lists	319
IP Community List Commands	320
ip community-list	320
show ip community-lists	321
deny (for Standard IP ACLs)	322
deny (for Extended IP ACLs)	323
seq (for Standard IPv4 ACLs)	325
deny tcp (for Extended IP ACLs)	327
deny udp (for Extended IP ACLs)	329
deny arp (for Extended MAC ACLs)	330
deny icmp (for Extended IP ACLs)	332
deny ether-type (for Extended MAC ACLs)	333
deny (for Standard MAC ACLs)	335
deny (for Extended MAC ACLs)	337
permit (for Standard IP ACLs)	339
permit arp (for Extended MAC ACLs)	340
permit ether-type (for Extended MAC ACLs)	342
permit icmp (for Extended IP ACLs)	344
permit udp (for Extended IP ACLs)	346
permit (for Extended IP ACLs)	347
permit (for Standard MAC ACLs)	349
seq (for Standard MAC ACLs)	351
permit tcp (for Extended IP ACLs)	353
seq arp (for Extended MAC ACLs)	354
seq ether-type (for Extended MAC ACLs)	356
seq (for IP ACLs)	358
seq (for IPv6 ACLs)	360
permit udp (for IPv6 ACLs)	361
permit tcp (for IPv6 ACLs)	363
permit icmp (for IPv6 ACLs)	365
permit (for IPv6 ACLs)	367
deny udp (for IPv6 ACLs)	368
deny tcp (for IPv6 ACLs)	370
deny icmp (for Extended IPv6 ACLs)	372
deny (for IPv6 ACLs)	374
Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM)	376
member vlan	376
ip access-group	377
show acl-vlan-group	378
show cam-acl-vlan	379
cam-acl-vlan	380
show cam-usage	381
show running config acl-vlan-group	385
acl-vlan-group	386
show acl-vlan-group detail	387
description (ACL VLAN Group)	388
Bidirectional Forwarding Detection (BFD)	390
bfd all-neighbors	390
bfd disable	392
bfd enable (Configuration)	393
bfd enable (Interface)	393
bfd interval	394
bfd neighbor	395
bfd protocol-liveness	396
ip route bfd	397
ipv6 ospf bfd all-neighbors	398
isis bfd all-neighbors	399
neighbor bfd	401
neighbor bfd disable	402
show bfd neighbors	403
vrrp bfd neighbor	405
Border Gateway Protocol	406
BGP IPv4 Commands	406
address-family	406
aggregate-address	408
bgp add-path	409
bgp always-compare-med	410
bgp asnotation	411
bgp bestpath as-path ignore	413
bgp bestpath as-path multipath-relax	413
bgp bestpath med confed	414
bgp bestpath med missing-as-best	415
bgp bestpath router-id ignore	416
bgp client-to-client reflection	416
bgp cluster-id	417
bgp confederation identifier	418
bgp confederation peers	420
bgp connection-retry-timer	421
bgp dampening	422
bgp default local-preference	423
bgp dmzlink-bw	424
bgp enforce-first-as	425
bgp fast-external-fallover	426
bgp four-octet-as-support	427
bgp graceful-restart	428
bgp non-deterministic-med	429
bgp recursive-bgp-next-hop	430
bgp regex-eval-optz-disable	431
bgp router-id	433
clear ip bgp	434
clear ip bgp dampening	435
clear ip bgp flap-statistics	437
clear ip bgp peer-group	439
deny bandwidth	440
debug ip bgp	440
debug ip bgp dampening	442
debug ip bgp events	443
debug ip bgp keepalives	444
debug ip bgp notifications	445
debug ip bgp soft-reconfiguration	446
debug ip bgp updates	447
default-metric	449
description	450
maximum-paths	451
neighbor activate	452
neighbor add-path	453
neighbor advertisement-interval	454
neighbor advertisement-start	455
neighbor allowas-in	455
neighbor default-originate	456
neighbor description	458
neighbor distribute-list	459
neighbor ebgp-multihop	460
neighbor fall-over	461
neighbor local-as	462
neighbor maximum-prefix	463
neighbor password	464
neighbor peer-group (assigning peers)	466
neighbor peer-group (creating group)	468
neighbor peer-group passive	469
neighbor remote-as	470
neighbor remove-private-as	471
neighbor route-map	472
neighbor route-reflector-client	473
neighbor sender-side-loopdetect	475
neighbor send-community	476
neighbor shutdown	477
neighbor soft-reconfiguration inbound	478
neighbor timers	479
neighbor update-source	481
neighbor weight	482
network	483
network backdoor	485
permit bandwidth	486
redistribute	486
redistribute ospf	488
router bgp	489
set extcommunity bandwidth	490
show capture bgp-pdu neighbor	491
show config	492
show ip bgp	493
show ip bgp cluster-list	495
show ip bgp community	498
show ip bgp community-list	501
show ip bgp dampened-paths	503
show ip bgp detail	504
show ip bgp extcommunity-list	507
show ip bgp filter-list	508
show ip bgp flap-statistics	510
show ip bgp inconsistent-as	513
show ip bgp neighbors	515
show ip bgp next-hop	519
show ip bgp paths	520
show ip bgp paths community	522
show ip bgp peer-group	523
show ip bgp regexp	525
show ip bgp summary	527
show running-config bgp	531
timers bgp	532
MBGP Commands	533
debug ip bgp dampening	533
distance bgp	534
show ip bgp dampened-paths	535
BGP Extended Communities (RFC 4360)	537
set extcommunity rt	537
set extcommunity soo	538
show ip bgp paths extcommunity	540
show ip extcommunity-list	541
IPv6 BGP Commands	542
clear ip bgp ipv6 unicast soft	542
debug ip bgp ipv6 unicast soft-reconfiguration	543
ipv6 prefix-list	544
neighbor soft-reconfiguration inbound	544
show ipv6 prefix-list	545
IPv6 MBGP Commands	546
show ipv6 mbgproutes	546
Content Addressable Memory (CAM)	548
CAM Profile Commands	549
cam-acl (Configuration)	549
cam-acl-egress	553
cam-optimization	553
show cam-acl	554
test cam-usage	556
Control Plane Policing (CoPP)	558
control-plane-cpuqos	558
service-policy rate-limit-cpu-queues	559
service-policy rate-limit-protocols	560
ip unknown-unicast	561
ipv6 unknown-unicast	561
show cpu-queue rate cp	562
show ip protocol-queue-mapping	563
show ipv6 protocol-queue-mapping	564
show mac protocol-queue-mapping	565
Debugging and Diagnostics	567
Diagnostics and Monitoring Commands	567
logging coredump stack-unit	567
Offline Diagnostic Commands	568
diag stack-unit	568
offline stack-unit	570
online stack-unit	571
Hardware Commands	572
clear hardware stack-unit	572
clear hardware system-flow	573
clear hardware vlan-counters	574
hardware watchdog	574
show hardware mac	575
show hardware ip	576
show hardware stack-unit	577
show hardware buffer interface	586
show hardware counters interface	588
show hardware buffer-stats-snapshot	589
show hardware stack-unit buffer-stats-snapshot (Total Buffer Information)	591
show hardware system-flow	593
show hardware vlan-counters	595
show hardware drops	596
Dynamic Host Configuration Protocol (DHCP)	599
Commands to Configure the System to be a DHCP Server	599
clear ip dhcp	599
debug ip dhcp server	600
debug ipv6 dhcp	601
default-router	601
disable	602
dns-server	603
domain-name	603
excluded-address	604
hardware-address	605
host	606
lease	606
netbios-name-server	607
netbios-node-type	608
network	609
pool	609
show ip dhcp binding	610
show ip dhcp configuration	611
show ip dhcp conflict	612
show ip dhcp server	612
Commands to Configure Secure DHCP	613
arp inspection	613
arp inspection-trust	614
clear ip dhcp snooping	615
clear ipv6 dhcp snooping binding	616
ip dhcp relay	617
ip dhcp snooping	617
ipv6 dhcp snooping	618
ipv6 dhcp snooping vlan	619
ip dhcp snooping binding	619
IPv6 DHCP Snooping Binding	621
ip dhcp snooping database	622
ipv6 dhcp snooping database write-delay	622
ip dhcp snooping database renew	623
ipv6 dhcp snooping database renew	624
ip dhcp snooping trust	624
ipv6 dhcp snooping trust	625
ip dhcp source-address-validation	625
ip dhcp relay information-option	626
ip dhcp snooping verify mac-address	627
ipv6 dhcp snooping verify mac-address	628
ip helper-address	628
ipv6 helper-address	629
show ip dhcp snooping	630
show ipv6 dhcp snooping	633
Commands to Configure DNS	634
ip name-server	634
ip domain-name	635
ip domain-list	635
ip host	636
clear host	637
Equal Cost Multi-Path (ECMP)	639
ecmp-group	639
hash-algorithm	640
ip ecmp-group	643
ip ecmp weighted	643
link-bundle-monitor enable	644

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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
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948
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950
951
952
953
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955
956
957
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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
1,800
1,801
1,802
1,803
1,804
1,805
1,806
1,807
1,808
1,809
1,810
1,811
1,812
1,813
1,814
1,815
1,816
1,817
1,818
1,819
1,820
1,821
1,822
1,823
1,824
1,825
1,826
1,827
1,828
1,829
1,830
1,831
1,832
1,833
1,834
1,835
1,836
1,837
1,838
1,839
1,840
1,841
1,842
1,843
1,844
1,845
1,846
1,847
1,848
1,849
1,850
1,851
1,852
1,853
1,854
1,855
1,856
1,857
1,858
1,859
1,860
1,861
1,862
1,863
1,864
1,865
1,866
1,867
1,868
1,869
1,870
1,871
1,872
1,873
1,874
1,875
1,876
1,877

Match case Limit results 1 per page

Verison

Description

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.

Layer 2

Overhead

Difference between Link MTU and IP MTU

Ethernet

(untagged)

18 bytes

VLAN Tag

Tag 22 bytes

Untagged Packet

with VLAN-Stack

Header

22 bytes

IPv4 Routing

857