Brocade Unified IP MIB Reference (Supporting FastIron Release 07.5.00) - Manual (Page 596)

568 Unified IP MIB Reference
53-1002549-02
IGMP interface table
IGMP interface table
The IGMP interface table contains the group membership information of a port.
IGMP static group table
The IGMP static group table contains a list of IGMP static group entries. This table is available when
IP Multicast Traffic Reduction is enabled on a Layer 2 Switch. The snSwGroupIpMcastMode MIB
object enables or disables IP multicast using SNMP.
By default, Layer 2 Switches forward all IP multicast traffic out of all ports except the port on which
the traffic was received. To reduce multicast traffic through the Layer 2 Switch, you can enable IP
Multicast Traffic Reduction. This feature configures the Layer 2 Switch to forward multicast traffic
only on the ports attached to multicast group members. The Layer 2 Switch determines the ports
that are attached to multicast group members based on entries in the IGMP table. Each entry in
the table consists of an IP multicast group address and the Layer 2 Switch ports from which the
Layer 2 Switch has received Group Membership reports for that group.
After you enable IP Multicast Traffic Reduction, when the Layer 2 Switch receives traffic for an IP
multicast group, the Layer 2 Switch looks in the IGMP table for an entry for that group. If the Layer
2 Switch finds an entry, the Layer 2 Switch forwards the group traffic out of the ports listed in the
group entry. If the table does not contain an entry for the group, the Layer 2 Switch broadcasts the
traffic.
The IGMP table is populated by receipt of Group Membership messages from IP multicast group
members. Each Group Membership message contains the member’s IP address and the group
address.
Name, OID, and syntax Access Description
snIgmpIfTable
brcdIp.1.2.6.1.3 None The IGMP interface table.
snIgmpIfEntryIndex
brcdIp.1.2.6.1.3.1.1
Syntax: Integer32 Read-only The table entry index.
snIgmpIfPortNumber
brcdIp.1.2.6.1.3.1.2
Syntax: Integer32 Read-only Shows the port number (interface) on which the group was learned.
snIgmpIfGroupAddress
brcdIp.1.2.6.1.3.1.3
Syntax: IpAddress Read-only Shows the group’s IP address learned from the interface.
snIgmpIfGroupAge
brcdIp.1.2.6.1.3.1.4
Syntax: Integer32 Read-only Specifies how many seconds the Layer 3 Switch will wait for an IGMP
response from an interface before concluding that the group member
on that interface is down. The switch will then begin to remove the
interface from the group.
Valid values: 1 – 10 seconds
Default: 5 seconds