3Com 4007, Implementation Manual, Page: 438 / 684

438 C
HAPTER
18: IP M
ULTICAST
R
OUTING
Key Guidelines for
Implementation
A Switch 4007 Multilayer Switching Module needs to have IP multicast
routing features enabled only if network users that sit downstream of the
module (from the perspective of the source location) require access to IP
multicast application traffic.
Configuration
Procedure
To activate IP multicast routing and filtering capabilities in a Multilayer
Switching Module, follow this general procedure:
1 Configure VLANs and IP routing interfaces on the module. See
Chapter 14 for more information about VLANs. See Chapter 16 for more
information about IP routing.
2 Ensure that IGMP snooping and querying functions are enabled on the
module.
For general information about IGMP, see “How IGMP Supports
IP Multicast” earlier in this chapter.
For information about configuring IGMP functions on a Layer 3 module,
see “Configuring IGMP Options” later in this chapter.
To figure IGMP functions on Switch 4007 Layer 2 Switching Modules, see
Chapter 11
in this guide.
3 Enable DVMRP on each interface that is to perform IP multicast routing.
You can modify the default TTL threshold and DVMRP metric values for
each interface.
For general information about DVMRP see “How DVMRP Supports
IP Multicast” earlier in this chapter.
For information about configuring DVMRP, see “Configuring DVMRP
Interfaces” later in this chapter.
4 If your network requires a multicast tunnel and if a Multilayer Switching
Module is to going to serve as one or more tunnel endpoints, configure
the tunnels now. (Remember to configure the tunnels on the remote
systems as well.)
See “Configuring DVMRP Tunnels” later in this chapter.
5 Configure a default route on an interface (if applicable to your network).
See “Configuring DVMRP Default Routes” later in this chapter.