IP Multicasting at Layer 2

How hosts tell routers about group membership Routers solicit group membership from directly connected hosts RFC 1112 specifies first version of IGMP RFC 2236 specifies current version of IGMP IGMP v3 enhancements Supported on UNIX systems, PCs, and MACs
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IP Multicasting at Layer 2 IP Multicasting at Layer 2 IP Multicasting at Layer 2 BSCI © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 1 CCNP – BSCI Bachkhoa Networking Academy Objectives – MAC Layer Multicast Addresses – IGMPv1 – IGMPv2 – IGMP v1-v2 Interoperability om – IGMPv3 .c – L2 Multicast Frame Switching a d 5 .0 ac v . bk NP w C w C w BSCI © 2008 Cisco Systems, Inc. All rights reserved. Học viện mạng Bách Khoa - www.bkacad.com 2 CCNP – BSCI Bachkhoa Networking Academy Layer 3 Multicast Addressing  IP group addresses 224.0.0.0–239.255.255.255  “Class D” addresses = high order bits of “1110”  Special reserved group addresses: 224.0.0.0– 224.0.0.255: –224.0.0.1 All systems on this subnet om –224.0.0.2 All routers on this subnet .c a d 5 .0 –224.0.0.4 DVMRP routers ac v . bk NP w C w C w BSCI © 2008 Cisco Systems, Inc. All rights reserved. Học viện mạng Bách Khoa - www.bkacad.com 3 CCNP – BSCI Bachkhoa Networking Academy Layer 2 Multicast Addressing om .c a d 5 .0 ac v . bk NP w C w C w BSCI © 2008 Cisco Systems, Inc. All rights reserved. Học viện mạng Bách Khoa - www.bkacad.com 4 CCNP – BSCI Bachkhoa Networking Academy Layer 2 Multicast Addressing om .c a d 5 .0 ac v . bk NP w C w C w BSCI © 2008 Cisco Systems, Inc. All rights reserved. Học viện mạng Bách Khoa - www.bkacad.com 5 CCNP – BSCI Bachkhoa Networking Academy IGMP  How hosts tell routers about group membership  Routers solicit group membership from directly connected hosts  RFC 1112 specifies first version of IGMP  RFC 2236 specifies current version of IGMP  IGMP v3 enhancements om .c  Supported on UNIX systems, PCs, and MACs d .0 ca v5 ka P .b N w C w C w BSCI © 2008 Cisco Systems, Inc. All rights reserved. Học viện mạng Bách Khoa - www.bkacad.com 6 CCNP – BSCI Bachkhoa Networking Academy IGMPv1  RFC 1112—“Host extensions for IP Multicasting”  Membership Queries –Querier sends IGMP query messages to 224.0.0.1 with ttl = 1 One router on LAN is designated/elected to send queries Query interval 1–18000 seconds  Membership Reports ...