Topology Changes and Multicast Routing Recovery 342
How to Configure Multicast Subsecond Convergence 342
Modifying the Periodic RPF Check Interval 342
Configuring PIM RPF Failover Intervals 343
Modifying the PIM Router Query Message Interval 344
Verifying Multicast Subsecond Convergence Configurations 345
Configuration Examples for Multicast Subsecond Convergence 346
Example Modifying the Periodic RPF Check Interval 346
Example Configuring PIM RPF Failover Intervals 347
Modifying the PIM Router Query Message Interval Example 347
Additional References 347
Feature History and Information for Multicast Subsecond Convergence 348
CHAPTER 16
IP Multicast Optimization: IP Multicast Load Splitting across Equal-Cost Paths 349
Finding Feature Information 349
Prerequisites for IP Multicast Load Splitting across Equal-Cost Paths 349
Information About IP Multicast Load Splitting across Equal-Cost Paths 350
Load Splitting Versus Load Balancing 350
Default Behavior for IP Multicast When Multiple Equal-Cost Paths Exist 350
Methods to Load Split IP Multicast Traffic 352
Overview of ECMP Multicast Load Splitting 353
ECMP Multicast Load Splitting Based on Source Address Using the S-Hash
Algorithm 353
ECMP Multicast Load Splitting Based on Source and Group Address Using the Basic
S-G-Hash Algorithm 353
Predictability As a By-Product of Using the S-Hash and Basic S-G-Hash Algorithms 353
Polarization As a By-Product of Using the S-Hash and Basic S-G-Hash Algorithms 354
ECMP Multicast Load Splitting Based on Source Group and Next-Hop Address 355
Effect of ECMP Multicast Load Splitting on PIM Neighbor Query and Hello Messages
for RPF Path Selection 356
Effect of ECMP Multicast Loading Splitting on Assert Processing in PIM-DM and DF
Election in Bidir-PIM 356
Effect of ECMP Multicast Load Splitting on the PIM Assert Process in PIM-SM and
PIM-SSM 358
ECMP Multicast Load Splitting and Reconvergence When Unicast Routing Changes 359
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
OL-32598-01 xvii
Contents