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Configure PIM-SM Multicast Forwarding Control

Network Requirements

  • The whole network runs the PIM-SM protocol.
  • Receiver is one receiver of Device3 end network.
  • Device2 is C-BSR and C-RP.
  • On Device2 and Device3, control the multicast source, making Receiver only receive the multicast service packet sent by Source1.
  • Run IGMPv2 between Device3 and the end network.

Network Topology

Networking of configuring PIM-SM multicast forwarding control

Figure 7-3 Networking of configuring PIM-SM multicast forwarding control

Configuration Steps

Step 1: Configure the IP address of the interface. (omitted)

Step 2: Enable the unicast route protocol OSPF so that all devices in the network can communicate with each other.

#Configure Device1.

Device1#configure terminal
Device1(config)#router ospf 100
Device1(config-ospf)#network 2.0.0.0 0.0.0.255 area 0
Device1(config-ospf)#network 3.0.0.0 0.0.0.255 area 0
Device1(config-ospf)#network 10.0.0.0 0.0.255.255 area 0
Device1(config-ospf)#exit

#Configure Device2.

Device2#configure terminal
Device2(config)#router ospf 100
Device2(config-ospf)#network 3.0.0.0 0.0.0.255 area 0
Device2(config-ospf)#network 4.0.0.0 0.0.0.255 area 0
Device2(config-ospf)#exit

#Configure Device3.

Device3#configure terminal
Device3(config)#router ospf 100
Device3(config-ospf)#network 2.0.0.0 0.0.0.255 area 0
Device3(config-ospf)#network 4.0.0.0 0.0.0.255 area 0
Device3(config-ospf)#exit

#View the route table of Device3.

Device3#show ip route  
Codes: C - connected, S - static, R - RIP, O - OSPF, OE-OSPF External, M - Management 
       D - Redirect, E - IRMP, EX - IRMP external, o - SNSP, B - BGP, i-ISIS  
 
Gateway of last resort is not set 
 
C 2.0.0.0/24 is directly connected, 15:51:07, vlan6 
O 3.0.0.0/24 [110/2] via 2.0.0.1, 15:33:34, vlan6 
             [110/2] via 4.0.0.1, 15:33:24, vlan8
C 4.0.0.0/24 is directly connected, 16:39:17, vlan8
C 5.0.0.0/24 is directly connected, 15:11:38, vlan9
O 10.0.0.0/24 [110/2] via 2.0.0.1, 00:06:32, vlan6
O 10.0.1.0/24 [110/2] via 2.0.0.1, 00:06:32, vlan6
O 10.0.2.0/24 [110/2] via 2.0.0.1, 00:06:32, vlan6
O 10.0.3.0/24 [110/2] via 2.0.0.1, 00:06:32, vlan6 

note


  • The viewing method of Device1 and device2 is the same as that of Device3, so the viewing process is omitted.

Step 3: Globally enable the multicast forwarding and enable the multicast protocol PIM-SM on the interface.

#Configure Device1.

Globally enable the multicast forwarding and enable the multicast protocol PIM-SM on the related interfaces.

Device1(config)#ip multicast-routing
Device1(config)#interface vlan2
Device1(config-if-vlan2)#ip pim sparse-mode
Device1(config-if-vlan2)#exit
Device1(config)#interface vlan3
Device1(config-if-vlan3)#ip pim sparse-mode
Device1(config-if-vlan3)#exit
Device1(config)#interface vlan4
Device1(config-if-vlan4)#ip pim sparse-mode
Device1(config-if-vlan4)#exit
Device1(config)#interface vlan5
Device1(config-if-vlan5)#ip pim sparse-mode
Device1(config-if-vlan5)#exit
Device1(config)#interface vlan6
Device1(config-if-vlan6)#ip pim sparse-mode
Device1(config-if-vlan6)#exit
Device1(config)#interface vlan7
Device1(config-if-vlan7)#ip pim sparse-mode
Device1(config-if-vlan7)#exit

#Configure Device2.

Globally enable the multicast forwarding and enable the multicast protocol PIM-SM on the related interfaces.

Device2(config)#ip multicast-routing
Device2(config)#interface vlan7
Device2(config-if-vlan7)#ip pim sparse-mode
Device2(config-if-vlan7)#exit
Device2(config)#interface vlan8
Device2(config-if-vlan8)#ip pim sparse-mode
Device2(config-if-vlan8)#exit

#Configure Device3.

Globally enable the multicast forwarding and enable the multicast protocol PIM-SM on the related interfaces.

Device3(config)#ip multicast-routing
Device3(config)#interface vlan6
Device3(config-if-vlan6)#ip pim sparse-mode
Device3(config-if-vlan6)#exit
Device3(config)#interface vlan8
Device3(config-if-vlan8)#ip pim sparse-mode
Device3(config-if-vlan8)#exit
Device3(config)#interface vlan9
Device3(config-if-vlan9)#ip pim sparse-mode
Device3(config-if-vlan9)#exit

#View the information of the interface enabled with the PIM-SM protocol on Device3 and the PIM-SM neighbor information.

Device3#show ip pim interface PIM Interface Table: 
PIM VRF Name: Default Total 3 Interface entries 
Total 0 External Interface entry 
Total 0 Sparse-Dense Mode Interface entry 
 
Address     Interface         VIF       Ver/   VIF   Nbr     DR          DR
BSR CISCO Neighbor 
                              Index    Mode  Flag         Count         Priority
Border Neighbor Filter 
2.0.0.2     vlan6             2        v2/S UP   1      1	2.0.0.2         
FALSE FALSE     
4.0.0.2     vlan8             0        v2/S UP   1      1
4.0.0.2    FALSE FALSE     
5.0.0.1    vlan9              3        v2/S UP   0      1
5.0.0.1    FALSE FALSE     
 
Device3#show ip pim neighbor
PIM Neighbor Table: 
PIM VRF Name: Default
Total 2 Neighbor entries 
 
Neighbor     Interface  Uptime/Expires    Ver DR  Priority/Mode
Address                           
2.0.0.1      vlan6      00:50:29/00:01:19 v2  1   / 
4.0.0.1      vlan8      00:57:58/00:01:33 v2  1   /

note


  • The viewing method of Device1 and device2 is the same as that of Device3, so the viewing process is omitted.

Step 4: Configure vlan7 of Device2 as C-BSR and C-RP of the whole network and the multicast group range of the C-RP service is 224.0.0.0/4.

#Configure Device2.

Device2(config)#ip pim bsr-candidate vlan7
Device2(config)#ip pim rp-candidate vlan7

#View the BSR and RP information of Device3.

Device3#show ip pim bsr-router
PIMv2 Bootstrap information
PIM VRF Name: Default 
  BSR address: 3.0.0.2 
  BSR Priority: 0 
  Hash mask length: 10 
  Up time: 00:10:37 
  Expiry time: 00:01:33 
  Role: Non-candidate BSR 
  State: Accept Preferred 
  
Device3#show ip pim rp mapping
PIM Group-to-RP Mappings Table:
PIM VRF Name: Default 
Total 1 RP set entry
Total 1 RP entry 
 
  Group(s): 224.0.0.0/4 
  RP count: 1 
    RP: 3.0.0.2 
      Info source: 3.0.0.2, via bootstrap, priority 192 
      Up time: 03:59:59 
      Expiry time: 00:01:49 

note


  • The viewing method of Device1 and device2 is the same as that of Device3, so the viewing process is omitted.

Step 5: On Device2 and Device3, control for the multicast source, making Receiver only receive the multicast service packet sent by Source1

#On Device2, configure the accepted register message access list, filtering the register message of Source4.

Device2(config)#ip access-list standard 1
Device2(config-std-nacl)#deny 10.0.3.0 0.0.0.255
Device2(config-std-nacl)#permit any
Device2(config-std-nacl)#commit
Device2(config-std-nacl)#exit
Device2(config)#ip pim accept-register list 1

#On interface vlan6 and vlan8 of Device3, configure the ingress ACL, filtering the multicast service packets of Source3.

Device3(config)#ip access-list extended 1001
Device3(config-ext-nacl)#deny ip 10.0.2.0 0.0.0.255 224.0.0.0 31.255.255.255
Device3(config-ext-nacl)#permit igmp any any
Device3(config-ext-nacl)#permit pim any any
Device3(config-ext-nacl)#permit ospf any any
Device3(config-ext-nacl)#permit ip any any
Device2(config-std-nacl)#commit
Device3(config-ext-nacl)#exit
Device3(config)#interface vlan6
Device3(config-if-vlan6)#ip access-group 1001 in
Device3(config-if-vlan6)#exit
Device3(config)#interface vlan8
Device3(config-if-vlan8)#ip access-group 1001 in
Device3(config-if-vlan8)#exit

#On interface vlan9 of Device3, configure the ingress  ACL, filtering the multicast service packets of Source2.

Device3(config)#ip access-list extended 1002
Device3(config-ext-nacl)#deny ip 10.0.1.0 0.0.0.255 224.0.0.0 31.255.255.255
Device3(config-ext-nacl)#permit igmp any any
Device3(config-ext-nacl)#permit pim any any
Device3(config-ext-nacl)#permit ip any any
Device3(config-ext-nacl)#commit
Device3(config-ext-nacl)#exit
Device3(config)#interface vlan9
Device3(config-if-vlan9)#ip access-group 1002 out
Device3(config-if-vlan9)#exit

Step 6: Check the result.

#Receiver sends the IMGPv2 member relation report to add to multicast group 225.1.1.1.

# Source1, Source2, Source3, and Source4 send the multicast packets with multicast group 225.1.1.1.

#View the multicast member table of Device2.

Device2#show ip igmp groups IGMP Connected Group Membership Total 1 groups 
Group Address  Interface   Uptime Expires    Last Reporter    V1 Expires
225.1.1.1      vlan9       00:00:38 00:03:45 5.0.0.2          stopped 

#View the multicast route table of Device3.

Device3#show ip pim mroute
IP Multicast Routing Table:
PIM VRF Name: Default
Total 0 (*,*,RP) entry
Total 1 (*,G) entry 
Total 2 (S,G) entries
Total 2 (S,G,rpt) entries
Total 0 FCR entry 
Up timer/Expiry timer 
 
(*, 225.1.1.1) 
Up time: 00:07:55
RP: 3.0.0.2 
RPF nbr: 4.0.0.1
RPF idx: vlan8
Flags: 
  JOIN DESIRED 
Upstream State: JOINED 
 
  Local interface list: 
    Vlan9 
  Joined interface list: 
  Asserted interface list:
 
(10.0.0.1, 225.1.1.1) 
Up time: 00:07:49
KAT time: 00:03:17
RPF nbr: 2.0.0.1
RPF idx: vlan6
SPT bit: TRUE
Flags: 
  JOIN DESIRED 
Upstream State: JOINED 
  Local interface list: 
  Joined interface list: 
  Asserted interface list: 
  Outgoing interface list: 
    vlan9 
  Packet count 268411 
 
(10.0.0.1, 225.1.1.1, rpt) 
Up time: 00:07:49
RP: 3.0.0.2 
Flags: 
  RPT JOIN DESIRED 
  PRUNE DESIRED 
  RPF SGRPT XG EQUAL 
Upstream State: PRUNED 
  Local interface list: 
  Pruned interface list: 
  Outgoing interface list: 
    Vlan9 
 
(10.0.1.1, 225.1.1.1) 
Up time: 00:07:49
KAT time: 00:03:17
RPF nbr: 2.0.0.1
RPF idx: vlan6
SPT bit: TRUE
Flags: 
  JOIN DESIRED 
Upstream State: JOINED 
  Local interface list: 
  Joined interface list: 
  Asserted interface list: 
  Outgoing interface list: 
   Vlan9 
  Packet count 268237 
 
(10.0.1.1, 225.1.1.1, rpt) 
Up time: 00:07:49
RP: 3.0.0.2 
Flags:        
  RPT JOIN DESIRED 
  PRUNE DESIRED 
  RPF SGRPT XG EQUAL 
Upstream State: PRUNED 
  Local interface list: 
  Pruned interface list: 
  Outgoing interface list:
   Vlan9 

note


  • The viewing method of Device1 and device2 is the same as that of Device3, so the viewing process is omitted.

#View the matching of ACL on Device2.

Device2#show ip access-list 1
ip access-list standard 1 
 10 deny 10.0.3.0 0.0.0.255    32 matches  
 20 permit any    2767 matches

#View the matching of ACL on Device3.

Device3#show ip access-list 1001
ip access-list extended 1001 
 10 deny ip 10.0.2.0 0.0.0.255 224.0.0.0 31.255.255.255    671545 matches 
 20 permit igmp any any    19 matches 
 30 permit pim any any    119 matches 
 40 permit ospf any any    252 matches 
 50 permit ip any any    1343339 matches 
 
Device3#show ip access-list 1002
ip access-list extended 1002 
 10 deny ip 10.0.1.0 0.0.0.255 224.0.0.0 31.255.255.255    672358 matches 
 20 permit igmp any any    10 matches 
 30 permit pim any any    40 matches 
 40 permit ip any any    672532 matches 

#Receive end can only receive the multicast service packets sent by Source1.

caution


  • When performing the multicast source control, you’d better first configure the multicast source control and then on-demand multicast source, because by default, after receiving the multicast service packet, the receiving end DR performs the SPT switching. If first on-demanding multicast source and then performing the multicast forwarding control, the multicast forwarding control does not take function. To prevent the multicast forwarding control from not taking function, you can configure not permitting SPT switching on the receiving end DR.