Reference Guide

28 Multiple Spanning Tree Protocol (MSTP)..................................................... 517
Protocol Overview.............................................................................................................................517
Spanning Tree Variations.................................................................................................................. 518
Implementation Information...................................................................................................... 518
Configure Multiple Spanning Tree Protocol.................................................................................... 518
Related Configuration Tasks.......................................................................................................518
Enable Multiple Spanning Tree Globally...........................................................................................519
Adding and Removing Interfaces..................................................................................................... 519
Creating Multiple Spanning Tree Instances..................................................................................... 519
Influencing MSTP Root Selection..................................................................................................... 521
Interoperate with Non-Dell Networking OS Bridges.......................................................................521
Changing the Region Name or Revision..........................................................................................522
Modifying Global Parameters...........................................................................................................522
Modifying the Interface Parameters.................................................................................................524
Configuring an EdgePort..................................................................................................................524
Flush MAC Addresses after a Topology Change............................................................................. 525
MSTP Sample Configurations...........................................................................................................526
Router 1 Running-ConfigurationRouter 2 Running-ConfigurationRouter 3 Running-
ConfigurationSFTOS Example Running-Configuration............................................................ 526
Debugging and Verifying MSTP Configurations..............................................................................529
29 Multicast Features..............................................................................................533
Enabling IP Multicast.........................................................................................................................533
Multicast with ECMP......................................................................................................................... 533
Implementation Information............................................................................................................534
First Packet Forwarding for Lossless Multicast................................................................................ 535
Multicast Policies...............................................................................................................................535
IPv4 Multicast Policies.................................................................................................................535
30 Open Shortest Path First (OSPFv2 and OSPFv3)........................................ 543
Protocol Overview............................................................................................................................543
Autonomous System (AS) Areas................................................................................................. 543
Area Types...................................................................................................................................544
Networks and Neighbors............................................................................................................545
Router Types............................................................................................................................... 545
Designated and Backup Designated Routers.............................................................................547
Link-State Advertisements (LSAs)............................................................................................... 547
Router Priority and Cost............................................................................................................. 549
OSPF with Dell Networking OS........................................................................................................549
Graceful Restart.......................................................................................................................... 550
Fast Convergence (OSPFv2, IPv4 Only)......................................................................................551