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Dell Force10 S4820T FTOS Command Reference Guide - Page 949

controlled by the second wait interval. Each subsequent wait interval is twice as long as the previous

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Usage Information This command spf-interval in CONFIG-ROUTER-ISIS-AF-IPV6 mode is used for IPv6 Multi-Topology route computation only. If using single topology mode, use the spf-interval command in CONFIG-ROUTER-ISIS mode for both IPv4 and IPv6 route computations. SPF throttling slows down the frequency at which route calculation are performed during network instability. Even though throttling route calculations slows down network convergence, not throttling can result in a network not functioning as expected. If network topology is unstable, throttling slows down the scheduling of route calculations until the topology regains its stability. The first route calculation is controlled by the initial wait interval and the second calculation is controlled by the second wait interval. Each subsequent wait interval is twice as long as the previous one until the wait interval reaches the maximum wait time specified (interval seconds). Once the network calms down and there are no triggers for two times the maximum interval, fast behavior is restored (the initial wait time). Intermediate System to Intermediate System (IS-IS) | 949

Section	Page
About this Guide	13
Objectives	13
Audience	13
Conventions	14
Information Symbols	14
Related Documents	14
CLI Basics	17
Accessing the Command Line	17
Multiple Configuration Users	18
Navigating the Command Line Interface	18
Obtaining Help	19
Using the Keyword No	21
Filtering show Commands	21
Displaying All Output	22
Filtering Command Output Multiple Times	22
Command Modes	23
EXEC Mode	23
EXEC Privilege Mode	23
CONFIGURATION Mode	23
INTERFACE Mode	23
LINE Mode	24
TRACE-LIST Mode	24
MAC ACCESS LIST Mode	25
IP ACCESS LIST Mode	25
ROUTE-MAP Mode	25
PREFIX-LIST Mode	26
AS-PATH ACL Mode	26
IP COMMUNITY LIST Mode	26
REDIRECT-LIST Mode	26
SPANNING TREE Mode	27
Per-VLAN SPANNING TREE Plus Mode	27
RAPID SPANNING TREE Mode	27
MULTIPLE SPANNING TREE Mode	28
PROTOCOL GVRP Mode	28
ROUTER OSPF Mode	28
ROUTER RIP Mode	28
ROUTER ISIS Mode	29
ROUTER BGP Mode	29
VLT DOMAIN Mode	29
Determining the Chassis Mode	30
File Management	31
Overview	31
Basic File Management Commands	31
Upgrading the C-Series FPGA	64
Control and Monitoring	67
Overview	67
Commands	67
Important Points to Remember	128
802.1ag	155
Overview	155
Commands	155
802.1X	169
Important Points to Remember	170
Access Control Lists (ACL)	187
Overview	187
Commands Common to all ACL Types	187
Common IP ACL Commands	190
Standard IP ACL Commands	195
Extended IP ACL Commands	203
Common MAC Access List Commands	238
Standard MAC ACL Commands	241
Extended MAC ACL Commands	246
IP Prefix List Commands	252
Route Map Commands	258
AS-Path Commands	278
IP Community List Commands	281
Bidirectional Forwarding Detection (BFD)	287
Overview	287
Commands	287
Border Gateway Protocol IPv4 (BGPv4)	303
Overview	303
BGPv4 Commands	304
MBGP Commands	395
BGP Extended Communities (RFC 4360)	421
Bare Metal Provisioning	431
Overview	431
Commands	431
Content Addressable Memory (CAM)	435
Overview	435
CAM Profile Commands	435
Important Points to Remember	436
CAM IPv4flow Commands	449
CAM Layer 2 ACL Commands	452
Control Plane Policing (CoPP)	457
Overview	457
Commands	457
Data Center Bridging	463
Overview	463
DCB and Switch Stacking Caveats for the S4820T	463
DCB Command	463
PFC Commands	463
ETS Commands	465
DCBX Commands	465
Dynamic Host Configuration Protocol (DHCP)	499
Overview	499
Commands to Configure the System to be a DHCP Server	499
Commands to Configure Secure DHCP	507
Equal Cost Multi-Path	515
Overview	515
Commands	515
FIPS Cryptography	525
Overview	525
FIPS	525
FIP Snooping	531
Overview	531
FIP	531
Force10 Resilient Ring Protocol (FRRP)	543
Overview	543
Commands	543
Important Points to Remember	543
GARP VLAN Registration (GVRP)	553
Overview	553
Commands	553
Important Points to Remember	554
High Availability (HA)	565
Overview	565
Commands	565
ICMP Message Types	577
Internet Group Management Protocol (IGMP)	579
Overview	579
IGMP Commands	579
Important Points to Remember	579
Command Limitations	587
IGMP Snooping Commands	592
Important Points to Remember for IGMP Snooping	592
Important Points to Remember for IGMP Querier	593
Interfaces	599
Overview	599
Basic Interface Commands	599
Important Points to Remember	610
Port Channel Commands	659
Time Domain Reflectometer (TDR)	670
Important Points to Remember	671
UDP Broadcast	673
Important Points to Remember	673
IPv4 Routing	677
Overview	677
Commands	677
IPv6 Access Control Lists (IPv6 ACLs)	737
Overview	737
Important Points to Remember	737
IPv6 ACL Commands	738
IPv6 Route Map Commands	765
IPv6 Basics	771
Overview	771
Commands	771
IPv6 Border Gateway Protocol (IPv6 BGP)	793
Overview	793
IPv6 BGP Commands	793
IPv6 MBGP Commands	865
iSCSI Optimization	893
Overview	893
Intermediate System to Intermediate System (IS-IS)	901
Overview	901
Commands	901
Link Aggregation Control Protocol (LACP)	951
Overview	951
Commands	951
Layer 2	959
Overview	959
MAC Addressing Commands	959
Virtual LAN (VLAN) Commands	981
Far-End Failure Detection (FEFD)	992
Overview	992
Commands	992
Link Layer Discovery Protocol (LLDP)	1001
Overview	1001
Commands	1001
LLDP-MED Commands	1011
Multicast Source Discovery Protocol (MSDP)	1021
Overview	1021
Commands	1021
Multiple Spanning Tree Protocol (MSTP)	1033
Overview	1033
Commands	1033
Multicast	1049
Overview	1049
IPv4 Multicast Commands	1049
IPv6 Multicast Commands	1059
Neighbor Discovery Protocol (NDP)	1067
Overview	1067
Commands	1067
Open Shortest Path First (OSPFv2)	1075
Overview	1075
OSPFv2 Commands	1075
PIM-Sparse Mode (PIM-SM)	1139
Overview	1139
IPv4 PIM-Sparse Mode Commands	1139
IPv6 PIM-Sparse Mode Commands	1163
Port Monitoring	1177
Overview	1177
Commands	1177
Important Points to Remember	1177
Private VLAN (PVLAN)	1183
Overview	1183
Commands	1183
Private VLAN Concepts	1183
Per-VLAN Spanning Tree Plus (PVST+)	1193
Overview	1193
Commands	1193
Quality of Service (QoS)	1207
Overview	1207
Global Configuration Commands	1207
Per-Port QoS Commands	1208
Policy-Based QoS Commands	1218
Important Points to Remember — multicast-bandwidth option	1234
Queue-Level Debugging	1258
Routing Information Protocol (RIP)	1269
Overview	1269
Commands	1269
Remote Monitoring (RMON)	1291
Overview	1291
Commands	1291
Rapid Spanning Tree Protocol (RSTP)	1305
Overview	1305
Commands	1305
Security	1317
Overview	1317
Commands	1317
AAA Accounting Commands	1318
Authorization and Privilege Commands	1321
Authentication and Password Commands	1325
RADIUS Commands	1339
TACACS+ Commands	1346
Port Authentication (802.1X) Commands	1349
Important Points to Remember	1350
SSH Server and SCP Commands	1360
Trace List Commands	1375
Secure DHCP Commands	1385
Service Provider Bridging	1391
Overview	1391
Commands	1391
Important Points to Remember	1391
sFlow	1397
Overview	1397
Important Points to Remember	1397
Commands	1398
Simple Network Management Protocol and Syslog	1409
Overview	1409
SNMP Commands	1409
Important Points to Remember	1410
Syslog Commands	1428
S-Series Stacking Commands	1443
Overview	1443
Switch Stacking an DCB Caveats for the S4820T	1443
Commands	1444
Storm Control	1453
Overview	1453
Commands	1453
Important Points to Remember	1453
Spanning Tree Protocol (STP)	1463
Overview	1463
Commands	1463
System Time and Date	1475
Overview	1475
Commands	1475
S4810 and S4820T u-Boot	1493
Overview	1493
Commands	1493
Uplink Failure Detection (UFD)	1497
Overview	1497
Commands	1497
VLAN Stacking	1507
Overview	1507
Commands	1507
Important Points to Remember	1507
Virtual Link Trunking (VLT)	1519
Overview	1519
Commands	1519
Virtual Router Redundancy Protocol (VRRP)	1533
Overview	1533
IPv4 VRRP Commands	1533
IPv6 VRRP Commands	1546
S-Series Debugging and Diagnostics	1553
Offline Diagnostic Commands	1553
Important Points to Remember	1553
Buffer Tuning Commands	1556
Hardware Commands	1561

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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

Match case Limit results 1 per page

Intermediate System to Intermediate System (IS-IS)

949

Usage

Information

This command

spf-interval

in CONFIG-ROUTER-ISIS-AF-IPV6 mode is used for IPv6

Multi-Topology route computation only. If using single topology mode, use the

spf-interval

command in CONFIG-ROUTER-ISIS mode for both IPv4 and IPv6 route computations.

SPF throttling slows down the frequency at which route calculation are performed during network

instability. Even though throttling route calculations slows down network convergence, not throttling

can result in a network not functioning as expected. If network topology is unstable, throttling slows

down the scheduling of route calculations until the topology regains its stability.

The first route calculation is controlled by the initial wait interval and the second calculation is

controlled by the second wait interval. Each subsequent wait interval is twice as long as the previous

one until the wait interval reaches the maximum wait time specified (

interval seconds

). Once the

network calms down and there are no triggers for two times the maximum interval, fast behavior is

restored (the initial wait time).