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Reducing Source-Active Message Flooding........................................................................................................ 569
Specifying the RP Address Used in SA Messages..............................................................................................569
MSDP Sample Congurations...................................................................................................................................... 571
31 Multiple Spanning Tree Protocol (MSTP)................................................................................................. 574
Protocol Overview......................................................................................................................................................... 574
Spanning Tree Variations...............................................................................................................................................575
Implementation Information....................................................................................................................................575
Congure Multiple Spanning Tree Protocol................................................................................................................575
Related Conguration Tasks................................................................................................................................... 576
Enable Multiple Spanning Tree Globally.......................................................................................................................576
Adding and Removing Interfaces.................................................................................................................................576
Creating Multiple Spanning Tree Instances.................................................................................................................577
Inuencing MSTP Root Selection................................................................................................................................578
Interoperate with Non-Dell Bridges............................................................................................................................. 578
Changing the Region Name or Revision..................................................................................................................... 579
Modifying Global Parameters....................................................................................................................................... 579
Modifying the Interface Parameters........................................................................................................................... 580
Conguring an EdgePort...............................................................................................................................................581
Flush MAC Addresses after a Topology Change....................................................................................................... 582
MSTP Sample Congurations......................................................................................................................................582
Router 1 Running-CongurationRouter 2 Running-CongurationRouter 3 Running-
CongurationSFTOS Example Running-Conguration.......................................................................................583
Debugging and Verifying MSTP Congurations........................................................................................................ 586
32 Multicast Features...................................................................................................................................588
Enabling IP Multicast.....................................................................................................................................................588
Implementation Information......................................................................................................................................... 588
Multicast Policies...........................................................................................................................................................589
IPv4 Multicast Policies............................................................................................................................................589
Understanding Multicast Traceroute (mtrace).......................................................................................................... 596
Important Points to Remember..............................................................................................................................597
Printing Multicast Traceroute (mtrace) Paths............................................................................................................597
Supported Error Codes.................................................................................................................................................598
mtrace Scenarios...........................................................................................................................................................599
33 Object Tracking....................................................................................................................................... 605
Object Tracking Overview............................................................................................................................................ 605
Track Layer 2 Interfaces......................................................................................................................................... 606
Track Layer 3 Interfaces......................................................................................................................................... 606
Track IPv4 and IPv6 Routes................................................................................................................................... 607
Set Tracking Delays................................................................................................................................................. 608
VRRP Object Tracking............................................................................................................................................ 608
Object Tracking Conguration..................................................................................................................................... 608
Tracking a Layer 2 Interface................................................................................................................................... 608
Tracking a Layer 3 Interface................................................................................................................................... 609
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