Dell PowerConnect M6220, Руководство по настройке пользователя

Страница: 709 / 1294

Configuring L2 Multicast Features
709
There are two configured learning modes of the MVR operation: dynamic and
compatible.
• In the dynamic mode MVR learns existent multicast groups by parsing the
IGMP queries from router on source ports and forwarding the IGMP joins
from the hosts to the router.
• In the compatible mode MVR does not learn multicast groups, but they
have to be configured by administrator and protocol does not forward joins
from the hosts to the router. To work in this mode the IGMP router has to
be configured to transmit required multicast streams to the network with
the MVR switch.
Enabling MVR and IGMP on the Same Interface
MVR and IGMP snooping operate independently and can both be enabled on
an interface. When both MVR and IGMP snooping are enabled, MVR listens
to the IGMP join and report messages for static multicast group information,
and IGMP snooping manages dynamic multicast groups.
When Are L3 Multicast Features Required?
In addition to L2 multicast features, the switch suports IPv4 and IPv6
multicast features. You configure the IPv4/IPv6 multicast features if the
switch functions as a multicast router that can route multicast traffic between
VLAN routing interfaces. In this case, you must enable a multicast routing
protocol on the switch, such as PIM-SM. For information about L3 multicast
features, see "Managing IPv4 and IPv6 Multicast" on page 1177.
If the switch functions as a multicast router, it is possible to enable both
IGMP and IGMP snooping so that IGMP forwards multicast traffic for
directly connected hosts between VLANs, and IGMP snooping prevents the
multicast router from flooding incoming multicast packets on the ingress
VLAN.