Bidirectional PIM is an extension to PIM SM that only uses the shared tree for multicast distribution. Typical use cases are when receivers also need to be senders such as with video conferencing. To enable PIM BiDir simple configure the global command ip pim bidir-enable on all multicast routers and designate an RP for the BiDir Multicast groups.
Concepts tested
- Bidirectional PIM configuration
- PIM SM configuratin
- PIM BSR
- Verification
Topology
Lab Tasks
- Configure PIM SM on all paths between R1 and R5
- Configure bi-direction PIM between R1 and R5 with R4 as the BSR and RP
- Only the group 224.0.0.0 /5 should be bidirectional
- Verify configuration
GNS3 configuration file, requires IOS v15 for the 7200 router: Link
Solution
R1(config)#ip multicast-routing
R1(config)#ip pim bidir-enable
R1(config)#int g0/0
R1(config-if)#ip pim sparse-mode
R1(config-if)#exit
R4(config)#ip multicast-routing
R4(config)#ip pim bidir-enable
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 loopback 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
R4(config)#ip access-list standard BIDIR_GROUP
R4(config-std-nacl)#permit 224.0.0.0 7.255.255.255
R4(config-std-nacl)#exit
R4(config)#ip pim rp-candidate loopback 0 group-list BIDIR_GROUP bidir
R4(config)#ip pim bsr-candidate loopback 0
R4(config)#
R5(config)#ip multicast-routing
R5(config)#ip pim bidir-enable
R5(config)#
R5(config)#int g0/0
R5(config-if)#ip pim sparse-mode
R5(config-if)#exit
Solution
R1(config)#ip multicast-routing
R1(config)#ip pim bidir-enable
R1(config)#int g0/0
R1(config-if)#ip pim sparse-mode
R1(config-if)#exit
R2(config)#ip multicast-routing
R2(config)#ip pim bidir-enable
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 multicast-routing
R3(config)#ip pim bidir-enable
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
R3(config)#
R4(config)#ip pim bidir-enable
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 loopback 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
R4(config)#ip access-list standard BIDIR_GROUP
R4(config-std-nacl)#permit 224.0.0.0 7.255.255.255
R4(config-std-nacl)#exit
R4(config)#ip pim rp-candidate loopback 0 group-list BIDIR_GROUP bidir
R4(config)#ip pim bsr-candidate loopback 0
R4(config)#
R5(config)#ip pim bidir-enable
R5(config)#
R5(config)#int g0/0
R5(config-if)#ip pim sparse-mode
R5(config-if)#exit
Verification
R1(config)#int g0/0
R1(config-if)#ip igmp join-group 224.0.10.1
R1(config-if)#
R5(config)#int g0/0
R5(config-if)#ip igmp join-group 224.0.10.1
R5(config-if)#
R4#ping 224.0.10.1 rep 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 224.0.10.1, timeout is 2 seconds:
Reply to request 0 from 120.0.45.5, 28 ms
Reply to request 0 from 120.0.0.1, 104 ms
Reply to request 0 from 120.0.45.5, 76 ms
Reply to request 0 from 120.0.0.1, 76 ms
R1#sh ip mroute 224.0.10.1
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
(*, 224.0.10.1), 00:02:36/00:02:49, RP 4.4.4.4, flags: BPL
Bidir-Upstream: GigabitEthernet0/0, RPF nbr 120.0.0.3
Outgoing interface list:
GigabitEthernet0/0, Bidir-Upstream/Sparse, 00:02:36/00:00:00
R2#sh ip mroute 224.0.10.1
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
(*, 224.0.10.1), 00:02:36/00:02:49, RP 4.4.4.4, flags: BP
Bidir-Upstream: GigabitEthernet1/0, RPF nbr 120.0.24.4
Outgoing interface list:
GigabitEthernet1/0, Bidir-Upstream/Sparse, 00:02:36/00:00:00
R3#sh ip mroute 224.0.10.1
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
(*, 224.0.10.1), 00:02:36/00:02:49, RP 4.4.4.4, flags: BC
Bidir-Upstream: GigabitEthernet1/0, RPF nbr 120.0.34.4
Outgoing interface list:
GigabitEthernet0/0, Forward/Sparse, 00:02:36/00:02:49
GigabitEthernet1/0, Bidir-Upstream/Sparse, 00:02:36/00:00:00
R4#sh ip mroute 224.0.10.1
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
(*, 224.0.10.1), 00:10:13/00:02:57, RP 4.4.4.4, flags: BC
Bidir-Upstream: Null, RPF nbr 0.0.0.0
Outgoing interface list:
GigabitEthernet1/0, Forward/Sparse, 00:02:36/00:02:52
GigabitEthernet2/0, Forward/Sparse, 00:03:13/00:02:57
R5#sh ip mroute 224.0.10.1
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
(*, 224.0.10.1), 00:03:37/00:02:57, RP 4.4.4.4, flags: BPL
Bidir-Upstream: GigabitEthernet0/0, RPF nbr 120.0.45.4
Outgoing interface list:
GigabitEthernet0/0, Bidir-Upstream/Sparse, 00:03:37/00:00:00
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