3Com CoreBuilder 2500, User Manual

Page: 145 / 244

11
A
DMINISTERING
IP M
ULTICAST
R
OUTING
This chapter describes how to set up your CoreBuilder
™
2500 system to
use IP multicast routing, including information about these tasks:
■
Enabling and Disabling DVMRP
■
Enabling and Disabling IGMP
■
Administering IP Multicast Interfaces
■
Administering Multicast Tunnels
■
Displaying Routes
■
Displaying the Multicast Cache
Before you define any IP multicast interfaces, you must first define IP
interfaces and routes, as described in Chapter 10.
For more information about how IP multicast routing works, see
Chapter 5, “Routing with IP Multicast.”
Enabling and
Disabling DVMRP
DVMRP (Distance Vector Multicast Routing Protocol) is similar to the IP
Routing Information Protocol (RIP). Multicast routers exchange distance
vector updates that contain lists of destinations and the distance in hops
to each destination. They maintain this information in a routing table.
To run multicast routing, you enable DVMRP, which enables it on all IP
interfaces that have not been disabled. To enable or disable DVMRP, from
the top level of the Administration Console, enter:
ip multicast dvmrp
The interface prompts you to enable or disable DVMRP.
Default
The default is disabled .
Example:
Enter DVMRP mode (disabled, enabled) [disabled]: enabled
Top-Level Menu
system
ethernet
fddi
atm
bridge
➧
ip
ipx
appletalk
snmp
analyzer
script
logout
interface
route
arp
atmArpServer
➧
multicast
udpHelper
icmpRouterDiscovery
rip
ping
statistics
➧
dvmrp
igmp
interface
tunnel
routeDisplay
cacheDisplay