PIM Sparse Mode
(PIM-SM) PIM Sparse Mode explicitly builds unidirectional shared trees rooted at
a (RP) rendezvous point per
group, and optionally creates shortest-path trees per source. (PIM-SM) PIM Sparse Mode generally
scales fairly well for wide-area usage.
Sparse-mode protocol do not forward the group traffic to any
other router unless it receives a message from that router requesting copies of packet sent to
particular group.
The PIM spares mode operation begins with the packet being
forwarded to special router called the rendezvous point (RP).
PIM Sparse Mode uses explicit join means (not receive unless you ask for). PIM Sparse Mode uses both shared tree & source tree, more scalable.
let see the configuration for better understanding.
Topology:
GOAL:
- configure the topology as per the diagram
- configure the IP addresses as per the topology
- configure OSPF 100 advertise the interfaces
- configure manually IGMP multicast group membership on router 2 for testing.
- configure router 2 loopback (120.1.1.1) a static rendezvous point (RP) advertise in OSPF 100 with the mask 32.
- configure RP address on all the routers.
R1#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.1.1.1 YES NVRAM up up
Serial3/0 1.1.1.1 YES NVRAM up up
Serial3/2 3.3.3.2 YES NVRAM up up
R2#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 20.1.1.1 YES NVRAM up up
Serial3/0 1.1.1.2 YES NVRAM up up
Serial3/1 2.2.2.1 YES NVRAM up up
Loopback0 120.1.1.1 YES NVRAM up up
R3#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 30.1.1.1 YES NVRAM up up
Serial3/1 2.2.2.2 YES NVRAM up up
Serial3/2 3.3.3.1 YES NVRAM up up
Serial3/3 4.4.4.2 YES NVRAM up up
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 40.1.1.1 YES NVRAM up up
Serial3/3 4.4.4.1 YES NVRAM up up
R1(config)#router ospf 100
R1(config-router)#network 10.0.0.0 0.255.255.255 area 0
R1(config-router)#network 1.0.0.0 0.255.255.255 area 0
R1(config-router)#network 3.0.0.0 0.255.255.255 area 0
R1(config-router)#exit
*Nov 19 20:58:03.523: %OSPF-5-ADJCHG: Process 100, Nbr
120.1.1.1 on Serial3/0 from LOADING to FULL, Loading Done
*Nov 19 20:58:52.515: %OSPF-5-ADJCHG: Process 100, Nbr
30.1.1.1 on Serial3/2 from LOADING to FULL, Loading Done
R2(config)#router ospf 100
R2(config-router)#network 20.0.0.0 0.255.255.255 area 0
R2(config-router)#network 2.0.0.0 0.255.255.255 area 0
R2(config-router)#network 1.0.0.0 0.255.255.255 area 0
R2(config-router)#exit
*Nov 19 20:58:03.611: %OSPF-5-ADJCHG: Process 100, Nbr
3.3.3.2 on Serial3/0 from LOADING to FULL, Loading Done
*Nov 19 20:58:57.567: %OSPF-5-ADJCHG: Process 100, Nbr
30.1.1.1 on Serial3/1 from LOADING to FULL, Loading Done
R3(config-router)#network 30.0.0.0 0.255.255.255 area 0
R3(config-router)#network 3.0.0.0 0.255.255.255 area 0
R3(config-router)#network 2.0.0.0 0.255.255.255 area 0
R3(config-router)#network 4.0.0.0 0.255.255.255 area 0
R3(config-router)#exit
*Nov 19 20:58:52.531: %OSPF-5-ADJCHG: Process 100, Nbr
3.3.3.2 on Serial3/2 from LOADING to FULL, Loading Done
*Nov 19 20:58:57.443: %OSPF-5-ADJCHG: Process 100, Nbr
120.1.1.1 on Serial3/1 from LOADING to FULL, Loading Done
R4(config)#router ospf 100
R4(config-router)#network 40.0.0.0 0.255.255.255 area 0
R4(config-router)#network 4.0.0.0 0.255.255.255 area 0
R4(config-router)#exit
*Nov 19 21:01:57.783: %OSPF-5-ADJCHG: Process 100, Nbr
30.1.1.1 on Serial3/3 from LOADING to FULL, Loading Done
R1(config)#ip multicast-routing
R1(config)#interface serial 3/0
R1(config-if)#ip pim sparse-mode
R1(config-if)#exit
R1(config-if)#interface serial 3/2
R1(config-if)#ip pim sparse-mode
R1(config-if)#exit
R1(config)#interface fastEthernet 0/0
R1(config-if)#ip pim sparse-mode
R1(config-if)#exit
*Nov 19 21:07:27.535: %PIM-5-DRCHG: DR change from neighbor
0.0.0.0 to 10.1.1.1 on interface FastEthernet0/0
R2(config)#ip multicast-routing
R2(config)#interface serial 3/0
R2(config-if)#ip pim sparse-mode
R2(config-if)#exit
R2(config)#interface serial 3/1
R2(config-if)#ip pim sparse-mode
R2(config-if)#exit
R2(config)#interface fastEthernet 0/0
R2(config-if)#ip pim sparse-mode
R2(config-if)#exit
R3(config)#ip multicast-routing
R3(config)#interface serial 3/1
R3(config-if)#ip pim sparse-mode
R3(config-if)#exit
R3(config)#interface serial 3/2
R3(config-if)#ip pim sparse-mode
R3(config-if)#exit
R3(config)#interface serial 3/3
R3(config-if)#ip pim sparse-mode
R3(config-if)#exit
R3(config)#interface fastEthernet 0/0
R3(config-if)#ip pim sparse-mode
R3(config-if)#exit
R4(config)#ip multicast-routing
R4(config)#interface serial 3/3
R4(config-if)#ip pim sparse-mode
R4(config-if)#exit
R4(config)#interface fastEthernet 0/0
R4(config-if)#ip pim sparse-mode
R4(config-if)#exit
*Nov 19 21:12:44.031: %PIM-5-DRCHG: DR change from neighbor
0.0.0.0 to 40.1.1.1 on interface FastEthernet0/0
R1#show ip pim interface
Address
Interface Ver/ Nbr
Query DR DR
Mode Count Intvl
Prior
10.1.1.1
FastEthernet0/0 v2/S 0
30 1 10.1.1.1
1.1.1.1 Serial3/0 v2/S 1
30 1 0.0.0.0
3.3.3.2
Serial3/2 v2/S 1
30 1 0.0.0.0
R2(config)#router ospf 100
R2(config-router)#network 120.0.0.0 255.0.0.0 area 0
R2(config-router)#exit
R1(config)#ip pim rp-address 120.1.1.1
R1(config)#exit
*Nov 19 22:18:17.103: %LINEPROTO-5-UPDOWN: Line protocol on
Interface Tunnel0, changed state to up
R2(config)#interface loopback 0
R2(config-if)#ip ospf network point-to-point
R2(config-if)#exit
*Nov 19 22:18:16.771: %PIM-6-INVALID_RP_JOIN: Received (*,
224.0.1.40) Join from 1.1.1.1 for invalid RP 120.1.1.1
R2(config)#ip pim rp-address 120.1.1.1
*Nov 19 22:18:33.263: %LINEPROTO-5-UPDOWN: Line protocol on
Interface Tunnel0, changed state to up
*Nov 19 22:18:33.375: %LINEPROTO-5-UPDOWN: Line protocol on
Interface Tunnel1, changed state to up
R2(config)#interface fastEthernet 0/0
R2(config-if)#ip igmp join-group 224.2.2.2
R2(config-if)#exit
(let see some show command for verification)
From Router 4
From Router 2
From Router 1
From Router 2
From Router 3
From Router 4
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