Network load control
10.2
Multicasts
118
UM Config GRS
Release
8.0
09/2019
Setting the IGMP querier function
The device itself optionally sends active query messages; alternatively, it responds to query
messages or detects other Multicast queriers in the network (
IGMP Snooping Querier
function).
Prerequisite:
The
IGMP Snooping
function is enabled globally.
Perform the following steps:
IGMP snooping enhancements (table)
The
Switching > IGMP Snooping > Snooping Enhancements
dialog provides you access to enhanced
settings for the
IGMP Snooping
function. You activate or deactivate the settings on a per port basis
in a VLAN.
The following settings are possible:
Static
Use this setting to set the port as a static query port. The device forwards every IGMP message
on a static query port, even if it has previously received no IGMP query messages on this port.
When the static option is disabled and the device has previously received IGMP query
messages, it forwards IGMP messages on this port. When this is the case, the entry displays
L
(“learned”).
Learn by LLDP
A port with this setting automatically discovers other Hirschmann devices using LLDP (Link
Layer Discovery Protocol). The device then learns the IGMP query status of this port from these
Hirschmann devices and configures the
IGMP Snooping Querier
function accordingly. The
ALA
entry indicates that the
Learn by LLDP
function is activated. When the device has found another
Hirschmann device on this port in this VLAN, the entry also displays an
A
(“automatic”).
Forward All
With this setting, the device forwards the data packets addressed to a Multicast address to this
port. The setting is suitable in the following situations, for example:
–
For diagnostic purposes.
–
For devices in an MRP ring: After the ring is switched, the
Forward All
function makes it
possible to reconfigure the network rapidly for data packets with registered Multicast
destination addresses. Activate the
Forward All
function on every ring port.
Open the
Switching > IGMP Snooping > Querier
dialog.
In the
Operation
frame, enable/disable the
IGMP Snooping Querier
function of the device
globally.
To activate the
IGMP Snooping Querier
function for a specific VLAN, mark the checkbox in
the
Active
column for the relevant VLAN.
The device carries out a simple selection process: When the IP source address of the other
Multicast querier is lower than its own, the device switches to the passive state, in which it
does not send out any more query requests.
In the
Address
column, you specify the IP Multicast address that the device inserts as the
sender address in generated query requests. You use the address of the Multicast router.
To save the changes temporarily, click the button.
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