Brocade Communications Systems IPMC5000PEF manual Igmp snooping configuration

IGMP snooping configuration

•A user can configure static router ports to force all multicast traffic to these specific ports.

•If a VLAN has a connection to a PIM-enabled port on another router, the VLAN must be configured as a non-querier (passive). When multiple snooping devices connect together and there is no connection to PIM ports, one device must be configured as a querier (active). If multiple devices are configured as active (queriers), only one will keep sending queries after exchanging queries.

•The querier must configure an IP address to send out queries.

•IGMP snooping requires hardware resource. Hardware resource is installed only when there is data traffic. If resource is inadequate, the data stream without a resource is mirrored to the CPU in addition to being VLAN flooded, which can cause high CPU usage. Brocade recommends that you avoid global enabling of snooping unless necessary.

•IGMP snooping requires clients to send membership reports in order to receive data traffic. If a client application does not send reports, you must configure static groups on the snooping VLAN to force traffic to client ports. Note that servers (traffic sources) are not required to send IGMP memberships.

•Support for VSRP together with IGMP snooping on the same interface.

•When VSRP or VSRP-aware is configured on a VLAN, only IGMP version 2 is recommended; IGMP version 3 is not recommended.

•Each VLAN can independently enable or disable IGMP, or configure IGMP v2 or IGMP v3.

•IGMP/PIM-SM snooping over Multi-Chassis Trunking is supported on ICX 6650, ICX 7750, and X series devices.

The following details apply to FCX, ICX 6610, ICX 6430, ICX 6450, and ICX 6650 devices:

•Using the drop option, you can configure a static group that can discard multicast data packets to a specified group in hardware, including addresses in the reserved range.

The following details apply to FastIron X Series devices:

•High CPU utilization occurs when IGMP Snooping and PIM routing are enabled simultaneously, and if the ingressing VLAN of the snooping traffic has "router-interface" configuration. With this configuration, IP Multicast data packets received in the snooping VLANs are forwarded to client ports via the hardware; however, copies of these packets are received and dropped by the CPU.

IGMP snooping configuration

Configuring IGMP snooping on a Brocade device consists of the following global, VLAN-specific, and port-specific tasks:

Perform the following global IGMP snooping tasks:

•Configuring the IGMP V3 snooping software resource limits

•Enabling IGMP snooping globally on the device

•Configuring the global IGMP mode

•Configuring the global IGMP version

•Modifying the age interval for group membership entries

•Modifying the query interval (active IGMP snooping mode only)

•Modifying the maximum response time

•Configuring report control (rate limiting)

•Modifying the wait time before stopping traffic when receiving a leave message

•Modifying the multicast cache age time

•Enabling or disabling error and warning messages

Perform the following VLAN-specific IGMP snooping tasks:

FastIron Ethernet Switch IP Multicast Configuration Guide	17
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