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Enterasys X-Pedition User Reference Manual 275
DVMRP Overview
You can use threshold values and scopes to control internetwork traffic on each DVMRP interface.
Threshold values determine whether traffic is either restricted or not restricted to a subnet, site, or
region. Scopes define a set of multicast addresses of devices to which the XP can send DVMRP
data. Scopes can include only addresses of devices on a company's internal network and cannot
include addresses that require the XP to send DVMRP data on the Internet. The XP also allows
control of routing information exchange with peers through route filter rules.
You can also configure tunnels on XP DVMRP interfaces. A tunnel is used to send packets between
routers separated by gateways that do not support multicast routing. A tunnel acts as a virtual
network between two routers running DVMRP. A tunnel does not run IGMP. The XP supports a
maximum of eight tunnels.
Note: Tunnel traffic is not optimized on a per-port basis, and it goes to all ports on an interface,
even though IGMP keeps per-port membership information. This is done to minimize
CPU overload for tunneled traffic.
Configuring DVMRP
You configure DVMRP routing on the XP by performing the following DVMRP-configuration
tasks:
• Creating IP interfaces
• Setting global parameters that will be used for all the interfaces on which DVMRP is enabled
• Configuring DVMRP on individual interfaces. You do so by enabling and disabling DVMRP
on interfaces and then setting DVMRP parameters on the interfaces on which DVMRP is
disabled
• Defining DVMRP tunnels, which IP uses to send multicast traffic between two end points
Starting and Stopping DVMRP
DVMRP is disabled by default on the XP.
To start or stop DVMRP, enter one of the following commands in Configure mode:
DVMRP on Individual Interfaces
DVMRP can be controlled/configured on per-interface basis. An interface does not have to run
both DVMRP and IGMP together. DVMRP can be started or stopped; IGMP starts and stops
Start DVMRP.
dvmrp start
Stop DVMRP.
no dvmrp start