GARP Multicast Registration Protocol

GARP Multicast Registration Protocol

GARP Multicast Registration Protocol (GMRP) is a Generic Attribute Registration Protocol (GARP) application that provides a multicast traffic management facility at Layer 2 similar to what IGMP provides at Layer 3. GMRP and GARP are industry-standard protocols first introduced as part of IEEE 802.1D.

GMRP provides a mechanism that allows bridges and end stations to dynamically register group membership information with the MAC bridges attached to the same LAN segment and for that information to be disseminated across all bridges in the Bridged LAN that supports extended filtering services. The operation of GMRP relies upon the services provided by the GARP.

GMRP software components run on both the switch and on the host. On the host, GMRP is typically used with IGMP: the host GMRP software spawns Layer 2 GMRP versions of the host's Layer 3 IGMP control packets. The switch receives both the Layer 2 GMRP and the Layer 3 IGMP traffic from the host. The switch uses the received GMRP traffic to constrain multicasts at Layer 2 in the host's VLAN. In all cases, you can use IGMP snooping to constrain multicasts at Layer 2 without the need to install or configure software on hosts.

When a host wants to join an IP multicast group, it sends an IGMP join message, which spawns a GMRP join message. Upon receipt of the GMRP join message, the switch adds the port through which the join message was received to the appropriate multicast group. The switch propagates the GMRP join message to all other hosts in the VLAN, one of which is typically the multicast source. When the source is multicasting to the group, the switch forwards the multicast only to the ports from which it received join messages for the group. The switch sends periodic GMRP queries. If a host wants to remain in a multicast group, it responds to the query. In this case, the switch does nothing. If a host does not want to remain in the multicast group, it can either send a leave message or not respond to the periodic queries from the switch. If the switch receives a leave message or receives no response from the host for the duration of the leave all timer, the switch removes the host from the multicast group.

GGMRP messages have the same structure as GARP where the attribute type is specific to GMRP: it can be as follows:
* Group Attribute Type.;
* Service Requirement Attribute Type.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Generic Attribute Registration Protocol — Le Generic Attribute Registration Protocol ou GARP (ou protocol d enregistrement d attribut générique) a été défini par l IEEE pour fournir une architecture dynamique pour que les ponts (ou des commutateurs réseaux) puissent enregistrer ou des… …   Wikipédia en Français

  • Multiple Registration Protocol — (MRP), which replaced Generic Attribute Registration Protocol (GARP), is a generic registration framework defined by the IEEE 802.1ak amendment to the IEEE 802.1Q standard. MRP allows bridges, switches or other similar devices to be able to… …   Wikipedia

  • Multiple Registration Protocol — (MRP), ранее известный как Generic Attribute Registration Protocol (GARP)  это общая структура, рекомендованная IEEE для использования в сетевых мостах, коммутаторах, или других аналогичных устройствах с возможностью регистрации и… …   Википедия

  • Multiple Registration Protocol — (MRP), autrefois connu sous les noms Generic Attribute Registration Protocol (GARP) et GARP VLAN Registration Protocol (GVRP) est un protocole standard de niveau 2 pour la configuration automatique des VLANs dans un réseau commuté. Il est défini… …   Wikipédia en Français

  • GARP — The Generic Attribute Registration Protocol was defined by the IEEE to provide a generic framework so bridges (or other devices like switches) could register and de register attribute values, such as VLAN identifiers and multicast group… …   Wikipedia

  • IP multicast — is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. It is often employed for streaming media applications on the Internet and private networks. The method is the IP specific version …   Wikipedia

  • IP Multicast — is a method of forwarding IP datagrams to a group of interested receivers. See the article on multicast for a general discussion of this subject this article is specifically about IP Multicast. IP multicast implementations Pay TV operators and… …   Wikipedia

  • SMART Multicast — is an experimental method of Secure Reliable IP Multicast. It allows a user to forward IP datagrams to an unlimited group of receivers. See the article on multicast for a general discussion of this subject this article is specifically about SMART …   Wikipedia

  • IP Multicast — es un método para transmitir datagramas IP a un grupo de receptores interesados. Puedes ver el artículo de multidifusión para ver una discusión general del asunto. En este artículo se trata específicamente la multidifusión IP. Contenido 1… …   Wikipedia Español

  • GMRP — GARP Multicast Registration Protocol (Computing » Networking) …   Abbreviations dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”