IGMP (Internet Group Management Protocol)

With this dialog you can

Operation

In this frame you can:

Tab. IGMP Snooping, global function

Parameters

Meaning

Possible values

Default setting

Operation

Activate/deactivate IGMP Snooping globally for the device.

If IGMP Snooping is switched off:

  • the device does not evaluate Query and Report packets received, and

  • it sends (floods) received data packets with a Multicast address as the destination address to all ports.

On

Off

Off


IGMP Querier and IGMP settings

With these frames you can enter global settings for the IGMP settings and the IGMP Querier function.

Prerequisite: The IGMP Snooping function is activated globally.

Tab. IGMP Querier and IGMP settings

Parameters

Meaning

Possible values

Default setting

IGMP Querier

IGMP Querier active

Switch query function on/off

on

off

off

Protocol Version

Select IGMP version 1, 2 or 3.

1, 2, 3

2

Transmit Interval [s]

Enter the interval at which the switch sends query packets.

All IGMP-capable terminal devices respond to a query with a report message.

2-3599 sa

125 s

IGMP settings

Current querier IP address

Display the IP address of the router/switch that has the query function.

Max. Response Time

Enter the time within which the multicast group members are to respond to a query.

The multicast group members select a random value within the response time for their response to prevent all multicast group members from responding to the query at the same time.

Protocol Version
- 1, 2: 1-25 s
- 3: 1-3598 s

Note the connection between the parameters Max. Response Time, Transmit interval and Group Membership Interval 'Value range for Max. Response Time, Transmit Interval and Group Membership Interval'.

10 s

Group Membership Interval

Enter the period for which a dynamic Multicast group remains entered in the device if it does not receive any report messages.

3-3600 sa

260 s


The parameters

have a relationship to one another:

Max. Response Time < Transmit Interval < Group Membership Interval.

If you enter values that contradict this relationship, the device then replaces these values with a default value or with the last valid values.

Tab. Value range for Max. Response Time, Transmit Interval and Group Membership Interval

Parameters

Protocol Version

Possible values

Default setting

Max. Response Time

1, 2
3

1-25 seconds 1-3,598 seconds

10 seconds

Transmit Interval

1, 2, 3

2-3,599 seconds

125 seconds

Group Membership Interval

1, 2, 3

3-3,600 seconds

260 seconds


For “Transmit interval” and “Max. Response Time”,

Multicasts

In this frame you specify how the device transmits packets with

Prerequisite: The IGMP Snooping function is activated globally.

Tab. Known and unknown Multicasts

Parameters

Meaning

Possible values

Default setting

Unknown Multicasts

  • Send to Query Ports:
    The device sends the packets with an unknown MAC/IP Multicast address to all query ports.

  • Send to All Ports:
    The device sends the packets with an unknown MAC/IP Multicast address to all ports.

  • Discard:
    The device discards all packets with an unknown MAC/IP Multicast address.

Send to Query Ports

Send to All Ports

Discard

Send to All Ports

Known Multicasts

  • Send to query and registered ports:
    The device sends the packets with a known MAC/IP Multicast address to all query ports and to registered ports.
    The advantage of this setting is that it works in many applications without any additional configuration.
    Application:
    “Flood and Prune” routing in PIM-DM.

  • Send to registered ports:
    The device sends the packets with a known MAC/IP Multicast address to registered ports. The advantage of this setting is that it uses the available bandwidth optimally through direct distribution. It requires additional port settings.
    Application:
    Routing protocol PIM-SM.

Send to query and registered ports:

Send to registered ports

Send to registered ports


Note: The way in which unlearned Multicast addresses are handled
also applies to the reserved addresses from the “Local Network Control Block” (224.0.0.0 - 224.0.0.255). This can have an effect on higher-level routing protocols.

Settings per Port (Table)

With this configuration table you can enter port-related IGMP settings.

Tab. Settings per port

Parameters

Meaning

Possible values

Default setting

Port

Module and port numbers to which this entry applies.

-

-

IGMP enabled

Switch IGMP on/off for each port.
Switching IGMP off at a port prevents registration for this port.

Prerequisite: The IGMP Snooping function is activated globally.

On

Off

On

IGMP Forward All

Switch the IGMP Snooping function Forward All on/off.
With the IGMP Forward All setting, the device sends to this port all data packets with a Multicast address in the destination address field.

Prerequisite: The IGMP Snooping function is activated globally.

Note: If a number of routers are connected to a subnetwork, you must use IGMP version 1 so that all the routers receive all the IGMP reports.
Note: If you use IGMP version 1 in a subnetwork, then you must also use IGMP version 1 in the entire network.

On

Off

Off

IGMP Automatic Query Port

Displays which ports the device has learned as query ports if automatic is selected in “Static Query Port”.

Prerequisite: The IGMP snooping function is activated globally.

yes, no

-

Static Query Port

The device sends IGMP report messages to the ports at which it receives IGMP queries (default setting). This column allows you to also send IGMP report messages to: other selected ports (enable) or connected Hirschmann devices (automatic).

Prerequisite: The IGMP snooping function is activated globally.

enable,
disable,
automatic

disable

Learned Query Port

Shows at which ports the device has received IGMP queries if “disable” is selected in “Static Query Port”.

Prerequisite: The IGMP Snooping function is activated globally.

Yes

No

-


Note: If the device is incorporated into a HIPER-Ring, you can use the following settings to quickly reconfigure the network for data packets with registered Multicast destination addresses after the ring is switched:

Buttons

Tab. Buttons (Forts.)

Button

Meaning

“Set”

Transfers the changes to the volatile memory (RAM) of the device. To permanently save the changes afterwards, you open the Basic Settings:Load/Save dialog and click “Save”.

“Reload”

Updates the fields with the values that are saved in the volatile memory (RAM) of the device.

“Help”

Opens the online help.