IPv4 Multicast
IPv4 Multicast
IPv4 Multicast
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Flashcards
What does Reverse Path Forwarding (RPF) do?
Verifies that multicast traffic travels in the reverse direction of unicast traffic, away from the tree root
What is Cisco Group Management Protocol (CGMP)?
A proprietary protocol used by switches to obtain multicast membership information for end hosts (deprecated)
What is IGMP for?
Hosts send IGMP requests to local routers to join multicast groups
IGMP Configuration - IGMP Support
IGMP Support Router(config-if)# ip igmp [version <#>]
IGMP Configuration - IGMP Snooping
IGMP Snooping Switch(config)# ip igmp snooping
What is PIM Dense Mode
The initial tree encompasses all multicast routers; after a period of time, routers without IGMP members prune back branches
What is PIM Sparse Mode?
The tree is grown from a central rendezvous point out to the multicast source and recipients
What is PIM Sparse Dense Mode?
Allows a PIM-enabled interface to function in either sparse or dense mode per group
What is PIMv1?
PIMv1 Provides automatic RP discovery with Auto-RP (Cisco proprietary)
What is PIMv2?
Automatic RP discovery is accomplished by the bootstrap router (BSR) method (standard)
PIM Configuration
ip multicast-routing
!
interface FastEthernet0/0 ip pim {sparse-mode | dense-mode | sparse-dense-mode} ip pim version {1 | 2}
Manual RP Configuration
ip pim rp-address
Auto-RP Mapping Agent configuration
ip pim send-rp-discovery scope
Auto-RP Candidate configuration
ip pim send-rp-announce
BSR Candidate configuration
ip pim bsr-candidate
BSR RP Candidate configuration
ip pim rp-candidate
MC Group Ranges - Local network control
224.0.0.0/24
MC Group Ranges - Internetwork control
224.0.1.0/24
MC Group Ranges - Source-specific
232.0.0.0/8
MC Group Ranges GLOP (RFC 3180)
233.0.0.0/8
MC Group Ranges - Admin-scoped
239.0.0.0/8
MC Common Groups - All hosts
224.0.0.1
MC Common Groups - All routers
224.0.0.2
MC Common Groups - Cisco RP Announce
224.0.1.39
MC Common Groups - Cisco RP Discovery
224.0.1.40
What is a Shard Distribution Tree?
A common set of links which carry all multicast traffic; statically configured
What is a Source-Rooted Distribution Tree?
Provides the shortest paths from the source to receivers
What is IGMPv1
Original IGMP specification
What is IGMPv2
Adds support for dynamic leave requests and querier election to original IGMP
What is IGMPv3
Adds multicast source filtering to v2
What is IGMP Snooping
A switch passively inspects IGMP requests to determine which hosts should receive multicast traffic
IGMP Troubleshooting commands
- show ip igmp
- show ip igmp group
- show ip igmp interface
- show ip igmp snooping
- ip igmp join-group
PIM Troubleshooting commands
- show ip mroute
- show ip pim interface
- show ip pim neighbor
- show ip pim rp [mapping]
- show ip rpf <IP>
