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ME60 V800R010C10SPC500 Feature Description - IP Multicast 01

This is ME60 V800R010C10SPC500 Feature Description - IP Multicast
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
MLD Querier Election

MLD Querier Election

An MLD multicast device can be either a querier or a non-querier:

  • Querier

    A querier is responsible for sending Multicast Listener Query messages to hosts and receiving Multicast Listener Report and Multicast Listener Done messages from hosts. A querier can then learn which multicast group has receivers on a specified network segment.

  • Non-querier

    A non-querier only receives Multicast Listener Report messages from hosts to learn which multicast group has receivers. Then, based on the querier's action, the non-querier identifies which receivers leave multicast groups.

Generally, a network segment has only one querier. Multicast devices follow the same principle to select a querier. The process is as follows (using Device A, Device B, and Device C as examples):

  • After MLD is enabled on Device A, Device A considers itself a querier in the startup process by default and sends Multicast Listener Query messages on the network segment. If Device A receives a Multicast Listener Query message from Device B that has a lower link-local address, Device A changes from a querier to a non-querier. Device A starts the another-querier-existing timer and records Device B as the querier of the network segment.

  • If Device A is a non-querier and receives a Multicast Listener Query message from Device B in the querier state, Device A updates another-querier-existing timer; if the received Multicast Listener Query message is sent from Device C whose link-local address is lower than that of Device B in the querier state, Device A records Device C as the querier of the network segment and updates the another-querier-existing timer.

  • If Device A is a non-querier and the another-querier-existing timer expires, Device A changes to a querier.

NOTE:

In this document version, querier election can be implemented only among multicast devices that run the same MLD version on a network segment.

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Updated: 2019-01-04

Document ID: EDOC1100059456

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