Igmp Snooping - Avaya 2330 Manual

PortFast BPDU Guard
The PortFast BPDU Guard feature prevents loops by moving a port into an "error disable" state
when that port receives a BPDU. When you enable the BPDU guard feature on the port,
Spanning Tree shuts down PortFast-configured interfaces that receive BPDUs, rather than
putting them into the Spanning Tree blocking state.
In a valid configuration, PortFast-configured interfaces do not receive BPDUs. If a PortFast-
configured interface receives a BPDU, an invalid configuration exists, such as the connection
of an unauthorized device.
PortFast BPDU Filter
By default, MSTP sends BPDU packets on all ports regardless of whether or not you have
enabled PortFast. Enabling PortFast BPDU filter on a port results in the following:
• stops sending BPDU packets
• stops processing of incoming BPDU packets
• sets the port to forwarding always
The purpose of the PortFast BPDU Filter command is to filter all incoming BPDUs on an
interface, which effectively disables spanning tree on an interface. You can apply the feature
on ports that connect to an end station or to routers. Although spanning tree is disabled, all
Layer 2 forwarding rules remain the same (in terms of packet flooding within a VLAN domain,
or in terms of supporting VLAN termination) to allow routing of Layer 2 packets.

IGMP Snooping

The Internet Group Management Protocol (IGMP) is a Layer 3 protocol used by IP hosts to
report multicast information to neighboring multicast routers.
IGMP Snooping allows a Layer 2 device to read (snoop) IGMP packets transferred between
IP multicast routers and IP multicast hosts to learn the IP multicast group membership. IGMP
Snooping allows the Layer 2 device to forward group-specific multicast traffic only to ports that
are members of that group. IGMP Snooping dynamically determines to which ports to send
specific multicast group traffic. Without IGMP Snooping, multicast traffic is forwarded to all
ports. IGMP Snooping drops all but one of the host "join" messages for each multicast group
and forwards only this one "join" message to the multicast router when proxy is enabled, which
reduces the number of IGMP messages exchanged between IP multicast routers and hosts.
The Secure Router 2330/4134 IGMP Snooping feature supports both IGMPv1 and IGMPv2.
IGMPv3 packets are silently discarded. Avaya recommends that in a network where IGMPv3
and IGMPv2 hosts co-exist, you configure the multicast router to send IGMPv2 messages so
that all hosts communicate using IGMPv2.
Configuration — Layer 2 Ethernet
IGMP Snooping
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