IPv4_Multicast
packetlife.net
by Jeremy Stretch v2.0
IPV4 MULTICAST
Layer 2 Addressing
224.0.0.0/24
Group Ranges
224.0.1.0/24
232.0.0.0/8
233.0.0.0/8
Local network control
Internetwork control
Source-specific
GLOP (RFC 3180)
239.0.0.0/8 Admin-scoped
IGMP Configuratio...
packetlife.net
by Jeremy Stretch v2.0
IPV4 MULTICAST
Layer 2 Addressing
224.0.0.0/24
Group Ranges
224.0.1.0/24
232.0.0.0/8
233.0.0.0/8
Local network control
Internetwork control
Source-specific
GLOP (RFC 3180)
239.0.0.0/8 Admin-scoped
IGMP Configuration
ip multicast-routing
!
interface FastEthernet0/0
ip pim {sparse-mode | dense-mode | sparse-dense-mode}
ip pim version {1 | 2}
Distribution Trees
Source-Rooted
Provides the shortest paths from the
source to receivers
Shared
A common set of links which carry all
multicast traffic; statically configured
IGMP Troubleshooting
show ip igmp
show ip igmp group
224.0.0.1
Common Groups
224.0.0.2
224.0.1.39
224.0.1.40
All hosts
All routers
Cisco RP Announce
Cisco RP Discovery
IGMP
IGMPv2
Adds support for dynamic leave requests
and querier election to original IGMP
IGMPv3
Adds multicast source filtering to v2
IGMP Snooping
A switch passively inspects IGMP
requests to determine which hosts
should receive multicast traffic
show ip igmp interface
show ip igmp snooping
ip igmp join-group
Terminology
Internet Group Management Protocol (IGMP)
Hosts send IGMP requests to local routers to join multicast groups
Reverse Path Forwarding (RPF)
Verifies that multicast traffic travels in the reverse direction of
unicast traffic, away from the tree root
Cisco Group Management Protocol (CGMP)
A proprietary protocol used by switches to obtain multicast
membership information for end hosts (deprecated)
IGMP Support
IGMP Snooping
Router(config-if)# ip igmp [version <#>]
Switch(config)# ip igmp snooping
Protocol Independent Multicast (PIM)
Dense Mode
The initial tree encompasses all multicast routers; after a period of
time, routers without IGMP members prune back branches
Sparse-Dense Mode
Allows a PIM-enabled interface to function in either sparse or dense
mode per group
Sparse Mode
The tree is grown from a central rendezvous point out to the
multicast source and recipients
PIMv1
Provides automatic RP discovery with Auto-RP (Cisco proprietary)
PIMv2
Automatic RP discovery is accomplished by the bootstrap router
(BSR) method (standard)
PIM Configuration
RP Configuration
Manual
Auto-RP Mapping Agent
ip pim rp-address
ip pim send-rp-discovery scope
Auto-RP Candidate
BSR Candidate
ip pim send-rp-announce
ip pim bsr-candidate
BSR RP Candidate ip pim rp-candidate
PIM Troubleshooting
show ip mroute
show ip pim interface
show ip pim neighbor
show ip pim rp [mapping]
show ip rpf
IGMPv1
Original IGMP specification
239.142.57.6
01-00-5E-0E-39-06
11101111 10001110 00111001 00000110
00000001 00000000 01011110 00001110 00111001 00000110
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