Source specific multicast or SSM uses IGMPv3 PM messages to allow receivers to specify the group and source they want to listen to. As a result there is no need to configure any RP infrastructure since SSM only uses the shortest path tree and not the shared tree to the RP. This simplifies configuration considerably.
Concepts tested
- Configuration PIM SSM
- Verifying PIM SSM
Topology
Lab Tasks
- Configure PIM SM across all paths between R1 and R5
- Configure PIM SSM on all multicast routers
- Configure PIM SSM to use the default SSM multicast group range of 232.0.0.0/8
- Have R1 join the group 232.0.10.1 with source 120.0.45.5
GNS3 configuration file, requires IOS v15 for the 7200 router: Link
Solution
R1(config)#ip multicast-routing
R1(config)#ip pim ssm default
R1(config)#int g0/0
R1(config-if)#ip pim sparse-mode
R1(config-if)#ip igmp version 3
R1(config-if)#exit
R2(config)#ip multicast-routing
R2(config)#ip pim ssm default
R2(config)#int g0/0
R2(config-if)#ip pim sparse-mode
R2(config-if)#exit
R2(config)#int g1/0
R2(config-if)#ip pim sparse-mode
R2(config-if)#exit
R3(config)#ip pim ssm default
R3(config)#int g0/0
R3(config-if)#ip pim sparse-mode
R3(config-if)#exit
R3(config)#int g1/0
R3(config-if)#ip pim sparse-mode
R3(config-if)#exit
R4(config)#ip pim ssm default
R4(config)#int g0/0
R4(config-if)#ip pim sparse-mode
R4(config-if)#exit
R4(config)#int g1/0
R4(config-if)#ip pim sparse-mode
R4(config-if)#exit
R4(config)#int g2/0
R4(config-if)#ip pim sparse-mode
R4(config-if)#exit
R5(config)#ip multicast-routing
R5(config)#ip pim ssm default
R5(config)#int g0/0
R5(config-if)#ip pim sparse-mode
R5(config-if)#ip igmp version 3
R5(config-if)#exit
R1(config)#int g0/0
R1(config-if)#ip igmp join-group 232.0.10.1 source 120.0.45.5
R1#sh ip igmp groups 232.0.10.1 detail
Flags: L - Local, U - User, SG - Static Group, VG - Virtual Group,
SS - Static Source, VS - Virtual Source,
Ac - Group accounted towards access control limit
Interface: GigabitEthernet0/0
Group: 232.0.10.1
Flags: L SSM
Uptime: 00:00:46
Group mode: INCLUDE
Last reporter: 120.0.0.1
Group source list: (C - Cisco Src Report, U - URD, R - Remote, S - Static,
V - Virtual, M - SSM Mapping, L - Local,
Ac - Channel accounted towards access control limit)
Source Address Uptime v3 Exp CSR Exp Fwd Flags
120.0.45.5 00:00:46 00:02:46 stopped Yes RL
R1#sh ip mroute 232.0.10.1
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(120.0.45.5, 232.0.10.1), 00:02:20/00:02:15, flags: sPLTI
Incoming interface: GigabitEthernet0/0, RPF nbr 120.0.0.3
Outgoing interface list: Null
R1#sh ip mroute 232.0.10.1 120.0.45.5
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(120.0.45.5, 232.0.10.1), 00:54:00/stopped, flags: sLTI
Incoming interface: GigabitEthernet0/0, RPF nbr 120.0.0.3
Outgoing interface list:
Loopback0, Forward/Sparse, 00:11:25/00:00:34
R4#sh ip mroute 232.0.10.1 120.0.45.5
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(120.0.45.5, 232.0.10.1), 00:11:47/00:02:33, flags: sT
Incoming interface: GigabitEthernet2/0, RPF nbr 120.0.45.5
Outgoing interface list:
GigabitEthernet1/0, Forward/Sparse, 00:11:47/00:02:33
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