Cisco PIM Sparse Mode with Static RP Configuration Example

Cisco PIM Sparse Mode with Static RP Configuration

In PIM Sparse Mode (PIM-SM), multicast traffic is only forwarded to group members which explicitly request it via join requests.Multicast flooding is much less than PIM Dense Mode(PIM-DM).PIM Sparse Mode is the recommended version.

We will provide an example for PIM Sparse Mode with static RP(rendezvous point):

Here is the topology for this example:

R1 is the multicast client for group 224.1.1.1

Configuration of R2

ip multicast-routing

interface Loopback0
 ip address 2.2.2.2 255.255.255.255
 ip ospf 1 area 0
!
interface FastEthernet0/0
 ip address 192.168.23.2 255.255.255.0
 ip pim sparse-mode
 no ip mroute-cache
!
interface FastEthernet0/1
 ip address 192.168.12.2 255.255.255.0
 ip pim dense-mode
 no ip mroute-cache
!
interface FastEthernet1/0
 ip address 192.168.24.2 255.255.255.0
 ip pim sparse-mode
 no ip mroute-cache
!
router ospf 1
 log-adjacency-changes
 network 192.168.0.0 0.0.255.255 area 0
!
ip pim rp-address 3.3.3.3

Configuration of R3:

ip multicast-routing

interface Loopback0
 ip address 3.3.3.3 255.255.255.255
 ip pim sparse-mode
 ip ospf 1 area 0
!
interface FastEthernet0/0
 ip address 192.168.23.3 255.255.255.0
 ip pim sparse-mode
 !
interface FastEthernet0/1
 ip address 192.168.34.3 255.255.255.0
 ip pim sparse-mode
!
router ospf 1
 log-adjacency-changes
 network 192.168.0.0 0.0.255.255 area 0
!
ip pim rp-address 3.3.3.3

R4 is the source and its configuration is similar to R2

Lets start the traffic from R4:

R4#ping         
Protocol [ip]:
Target IP address: 224.1.1.1     
Repeat count [1]: 10000
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: yes
Interface [All]: FastEthernet1/0
Time to live [255]:
Source address: 4.4.4.4
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 10000, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 4.4.4.4

Reply to request 0 from 192.168.12.1, 172 ms
Reply to request 1 from 192.168.12.1, 144 ms
Reply to request 2 from 192.168.12.1, 80 ms
Reply to request 3 from 192.168.12.1, 88 ms

Ping results are OK.Lets show some verifying commands:

R2#show ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
      S - State Refresh Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                            Prio/Mode
192.168.23.3      FastEthernet0/0          01:16:17/00:01:36 v2    1 / DR S
192.168.24.4      FastEthernet1/0          01:16:12/00:01:19 v2    1 / DR S

R2# show ip pim rp mapping
PIM Group-to-RP Mappings

Group(s): 224.0.0.0/4, Static
    RP: 3.3.3.3 (?)

R2#show ip mroute
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,
       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
Outgoing interface flags: H - Hardware switched, A - Assert winner
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.1.1.1), 00:47:12/stopped, RP 3.3.3.3, flags: SJC
  Incoming interface: FastEthernet0/0, RPF nbr 192.168.23.3
  Outgoing interface list:
    FastEthernet0/1, Forward/Dense, 00:47:12/00:00:00

(4.4.4.4, 224.1.1.1), 00:16:47/00:01:51, flags: JT
  Incoming interface: FastEthernet1/0, RPF nbr 192.168.24.4
  Outgoing interface list:
    FastEthernet0/1, Forward/Dense, 00:16:47/00:00:00

(*, 224.0.1.40), 00:47:14/00:02:10, RP 3.3.3.3, flags: SJPCL
  Incoming interface: FastEthernet0/0, RPF nbr 192.168.23.3
  Outgoing interface list: Null