Igmp (Internet Group Management Protocol) - Nokia Voyager Reference Manual

Hide thumbs Also See for Voyager:

Table of Contents

Configuring Routing

4. Click the

5. (Optional) Enter a new minimum IP time to live (TTL) threshold in the

6. (Optional) Enter a new cost metric for sending multicast packets in the

7. To make your changes permanent, click S

IGMP (Internet Group Management Protocol)

IGMP Description

IGMP allows hosts on multi-access networks to inform locally attached

routers of their group membership information. Hosts share their group

membership information by multicasting IGMP host membership reports.

Multicast routers listen for these host membership reports, and then exchange

this information with other multicast routers.

The group membership reporting protocol includes two types of messages:

host membership query and host membership report. IGMP messages are

encapsulated in IP datagrams, with an IP protocol number of 2. Protocol

operation requires that a designated querier router be elected on each subnet

and that it periodically multicast a host membership query to the all-hosts

Hosts respond to a query by generating host membership reports for each

multicast group to which they belong. These reports are sent to the group

being reported; this allows other active members on the subnet to cancel their

report. This limits the number of reports generated to one for each active

group on the subnet. This exchange allows the multicast routers to maintain a

database of all active host groups on each of their attached subnets. A group is

declared inactive (expired) when no report has been received for several

query intervals.

radio button for the interface; then click A

edit box for each interface; then click A

edit box for each interface; then click A

Voyager Reference Guide