Enterasys Xpedition User Reference Manual 217
Chapter 16
Multicast Routing
Configuration Guide
IP Multicast Overview
Multicast routing on the XP is supported through DVMRP and IGMP. IGMP is used to
determine host membership on directly attached subnets. DVMRP is used to determine
forwarding of multicast traffic between XPs.
This chapter:
• Provides an overview of the XP’s implementation of the Internet Group Management
Protocol (IGMP)
• Provides an overview of the XP’s implementation of the Distance Vector Multicast
Routing Protocol (DVMRP)
• Discusses configuring DVMRP routing on the XP
• Discusses configuring IGMP on the XP
IGMP Overview
The XP supports IGMP Version 2.0 as defined in RFC 2236. IGMP is run on a per-IP
interface basis. An IP interface can be configured to run just IGMP and not DVMRP. Since
multiple physical ports (VLANs) can be configured with the same IP interface on the XP,
IGMP keeps track of multicast host members on a per-port basis. Ports belonging to an IP
VLAN without any IGMP membership will not be forwarded any multicast traffic.
The XP allows per-interface control of the host query interval and response time. Query
interval defines the time between IGMP queries. Response time defines the time the XP
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