- Enterasys Security Router User's Guide

XSR User’s Guide 7-1
7
Configuring PIM-SM and IGMP
This chapter describes Protocol Independent Multicast - Sparse Mode (PIM-SM) and Internet
Group Management Protocol (IGMP) configuration.
Features
The XSR supports the following IGMP/PIM features:
• IGMP versions 1, 2 and 3 (on LAN interface only)
•PIM-SM version 2
• Static IGMP group membership
• Dynamic RP (BootStrap without Admin Scope Zone support)
•Static RP
• Register Mechanism
• Rendezvous Point Tree (RPT) Build-up
• Shortest Path Tree (SPT) Build-up
•RPT to SPT Switch
• Assert Mechanism
• Join/Prune Mechanism
• Source Specific Multicast (SSM) Support
• Multicast over GRE tunnel
Differences with Industry-Standard Approach
The XSR’s implementation of IGMP differs from the industry-standard approach as follows:
• The XSR stipulates the RFC-3376 default Query interval of 125; the industry-standard value is
60.
• The XSR supports dynamic learning of the robust value and query interval from the received
query message, as stipulated by RFC-3376, while the industry-standard router does not. The
XSR also supports static configuration and the latest value, either learned dynamically or
statically configured, will overwrite the previous value.
The XSR’s implementation of PIM-SM differs from the industry-standard approach as follows:
• When sending a Register packet, the XSR calculates the checksum of the Register packet
header only, in keeping with the RFC-2236 requirement. The industry-standard router