Reference Guide
638 | Multicast Features
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Prevent a PIM Router from Forming an Adjacency
To prevent a router from participating in Protocol Independent Multicast (PIM) (for example, to configure
stub multicast routing), use the
ip pim neighbor-filter command from INTERFACE mode.
Prevent a Source from Registering with the RP
Use the command ip pim register-filter from CONFIGURATION mode to prevent a source from
transmitting to a particular group. This command prevents the PIM source DR from sending register
packets to RP for the specified multicast source and group; if the source DR never sends register packets to
the RP, no hosts can ever discover the source and create an SPT to it.
In Figure 33-3, Source 1 and Source 2 are both transmitting packets for groups 239.0.0.1 and 239.0.0.2. R3
has a PIM register filter that only permits packets destined for group 239.0.0.2. An entry is created for
group 239.0.0.1 in the routing table, but no outgoing interfaces are listed. R2 has no filter, so it is allowed
to forward both groups. As a result, Receiver 1 receives only one transmission, while Receiver 2 receives
duplicate transmissions.
Figure 33-3. Preventing a Source from Transmitting to a Group
R1
R2
R3
Source 2
10.11.1.2
Source 1
10.11.5.2
Receiver 2
10.11.4.2
Receiver 1
10.11.3.2
Group: 239.0.0.2
1/31
3/11
2/11
2/31 3/21
interface Vlan 300
ip pim sparse-mode
ip address 10.11.3.1/24
untagged GigabitEthernet 1/1
no shutdown
interface GigabitEthernet 1/21
ip pim sparse-mode
ip address 10.11.12.1/24
no shutdown
interface GigabitEthernet 1/31
ip pim sparse-mode
ip address 10.11.13.1/24
no shutdown
interface GigabitEthernet 2/11
ip pim sparse-mode
ip address 10.11.12.2/24
no shutdown
interface GigabitEthernet 3/11
ip pim sparse-mode
ip address 10.11.13.2/24
no shutdown
interface GigabitEthernet 3/21
ip pim sparse-mode
ip address 10.11.23.2/24
no shutdown
interface GigabitEthernet 2/31
ip pim sparse-mode
ip address 10.11.23.1/24
no shutdown
3/1
ip multicast-routing
ip pim rp-address 10.11.12.2 group-address 224.0.0.0/4
router rip
network 10.0.0.0
1/21
ip igmp snooping enable
2/1
interface Vlan 400
ip pim sparse-mode
ip address 10.11.4.1/24
untagged GigabitEthernet 1/2
no shutdown
interface GigabitEthernet 3/1
ip pim sparse-mode
ip address 10.11.5.1/24
no shutdown
RP
Group: 239.0.0.1
239.0.0.1
239.0.0.2
interface GigabitEthernet 2/1
ip pim sparse-mode
ip address 10.11.1.1/24
no shutdown
R
1(config-line-console)#do show ip pim tib
P
IM Multicast Routing Table
F
lags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned,
R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT,
M - MSDP created entry, A - Candidate for MSDP Advertisement
K - Ack-Pending State
T
imers: Uptime/Expires
I
nterface state: Interface, next-Hop, State/Mode
(
*, 239.0.0.1), uptime 00:00:43, expires 00:00:00, RP 10.11.12.2, flags: SCJ
Incoming interface: GigabitEthernet 1/21, RPF neighbor 10.11.12.2
Outgoing interface list:
Vlan 400 Forward/Sparse 00:00:43/Never
(
10.11.1.2, 239.0.0.1), uptime 00:00:17, expires 00:03:17, flags: CT
Incoming interface: GigabitEthernet 1/21, RPF neighbor 10.11.12.2
Outgoing interface list:
Vlan 400 Forward/Sparse 00:00:43/Never
(
10.11.5.2, 239.0.0.1), uptime 00:00:23, expires 00:03:17, flags: CT
Incoming interface: GigabitEthernet 1/31, RPF neighbor 10.11.13.2
Outgoing interface list:
Vlan 400 Forward/Sparse 00:00:43/Never
(
*, 239.0.0.2), uptime 00:00:40, expires 00:00:00, RP 10.11.12.2, flags: SCJ
Incoming interface: GigabitEthernet 1/21, RPF neighbor 10.11.12.2
Outgoing interface list:
Vlan 300 Forward/Sparse 00:00:40/Never
(
10.11.5.2, 239.0.0.2), uptime 00:00:33, expires 00:03:07, flags: CT
Incoming interface: GigabitEthernet 1/31, RPF neighbor 10.11.13.2
Outgoing interface list:
Vlan 300 Forward/Sparse 00:00:40/Never
R3(conf)#do show ip pim tib
PIM Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned,
R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT,
M - MSDP created entry, A - Candidate for MSDP Advertisem
ent
K - Ack-Pending State
Timers: Uptime/Expires
Interface state: Interface, next-Hop, State/Mode
(10.11.5.2, 239.0.0.1), uptime 00:05:21, expires 00:02:46, flags: FT
Incoming interface: GigabitEthernet 3/1, RPF neighbor 0.0.0.0
Outgoing interface list:
GigabitEthernet 3/11 Forward/Sparse 00:00:18/00:03:12
(10.11.5.2, 239.0.0.2), uptime 00:05:08, expires 00:03:26, flags: FT
Incoming interface: GigabitEthernet 3/1, RPF neighbor 0.0.0.0
Outgoing interface list:
R
2(conf)#do show ip pim tib
P
IM Multicast Routing Table
F
lags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned,
R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT,
M - MSDP created entry, A - Candidate for MSDP Advertisement
K - Ack-Pending State
T
imers: Uptime/Expires
In
terface state: Interface, next-Hop, State/Mode
(*
, 239.0.0.1), uptime 00:03:00, expires 00:02:32, RP 10.11.12.2, flags: SF
Incoming interface: Null, RPF neighbor 0.0.0.0
Outgoing interface list:
GigabitEthernet 2/11 Forward/Sparse 00:03:00/00:02:32
(1
0.11.1.2, 239.0.0.1), uptime 00:00:44, expires 00:02:56, flags: FT
Incoming interface: GigabitEthernet 2/1, RPF neighbor 0.0.0.0
Outgoing interface list:
GigabitEthernet 2/11 Forward/Sparse 00:00:13/00:03:17
(1
0.11.5.2, 239.0.0.1), uptime 00:00:26, expires 00:03:06, flags: P
Incoming interface: GigabitEthernet 2/31, RPF neighbor 10.11.23.2
Outgoing interface list:
(*
, 239.0.0.2), uptime 00:00:21, expires 00:03:09, RP 10.11.12.2, flags: SF
Incoming interface: Null, RPF neighbor 0.0.0.0
Outgoing interface list:
GigabitEthernet 2/11 Forward/Sparse 00:00:21/00:03:09
(1
0.11.1.2, 239.0.0.2), uptime 00:00:02, expires 00:03:28, flags: FT
Incoming interface: GigabitEthernet 2/1, RPF neighbor 0.0.0.0
Outgoing interface list:
GigabitEthernet 2/11 Forward/Sparse 00:00:21/00:03:09
R3(conf)#do show run acl
!
ip access-list extended regfilS1G2
seq 5 permit ip host 10.11.5.2 host 239.0.0.1
R3(conf)#do show run pim
!
ip pim rp-address 10.11.12.2 group-address 224.0.0.0/4
ip pim register-filter regfilS1G2