Brocade Communications Systems IPMC5000PEF Manual De Usuario

multiple devices are configured as queriers, Brocade recommends that only one device (preferably the
one with the traffic source) is configured as a querier.

The non-queriers always forward multicast data traffic and IGMP messages to router ports which
receive IGMP queries or PIM hellos. Brocade recommends that you configure the device with the data
traffic source (server) as a querier. If a server is attached to a non-querier, the non-querier always
forwards traffic to the querier regardless of whether there are any clients on the querier.

NOTE
In a topology of one or more connecting devices, at least one device must be running PIM configured as
active. Otherwise, none of the devices can send out queries, and traffic cannot be forwarded to clients.

VLAN-specific configuration

IGMP snooping can be enabled on some VLANs or on all VLANs. Each VLAN can be independently
configured to be a querier or non-querier and can be configured for IGMP V2 or IGMP V3. In general,
the ip multicast commands apply globally to all VLANs except those configured with VLAN-specific
multicast commands. The VLAN-specific multicast commands supersede the global ip multicast
commands.

IGMP snooping can be configured for IGMP V2 or IGMP V3 on individual ports of a VLAN. An interface
or router sends the queries and reports that include its IGMP version specified on it. The version
configuration only applies to sending queries. The snooping device recognizes and processes IGMP V2
and IGMP V3 packets regardless of the version configuration.

To avoid version deadlock, an interface retains its version configuration even when it receives a report
with a lower version.

Tracking and fast leave

Brocade devices support fast leave for IGMP V2, and tracking and fast leave for IGMP V3. Fast leave
stops the traffic immediately when the port receives a leave message. Tracking traces all IGMP V3
clients. Refer to 

 on page 24 and 

 on page 25.

Support for IGMP snooping and Layer 3 multicast routing together on
the same device

The Brocade device supports global Layer 2 IP multicast traffic reduction (IGMP snoopoing) and Layer
3 multicast routing (PIM-Sparse or PIM-Dense) together on the same device in the full Layer 3 software
image, as long as the Layer 2 feature configuration is at the VLAN level.

Forwarding mechanism in hardware

IP-based forwarding implementation on FCX and ICX devices

The following information about *,G or S,G fdb-based implementation is specific to FCX, ICX 6610, ICX
6430, and ICX 6450 devices.

VLAN-specific configuration