Lab 3. Multicast - Sparse Dense Mode - Auto RP

• Auto RP is cisco proprietary.
• There are 2 types of auto RP:

1.      Sparse-dense mode auto RP

2.      Sparse mode auto RP

• In sparse-dense mode, RP Candidate and Mapping Agent use dense mode to distribute to other routers.
• Cisco-Announce use 224.0.1.39
• Cisco-Discovery use 224.0.1.40
• But for distribution multicast traffic still use sparse mode in auto RP sparse dense mode.
• In auto RP, configuration only in router that will be chosen as RP Candidate and Mapping Agent only
• In one group, only one RP is allowed. If need backup, it can use static RP

Lets do the lab :)

R1#

ip multicast-routing

!

interface Loopback0

 ip address 1.1.1.1 255.255.255.255

 ip pim sparse-dense-mode

 ip ospf 1 area 0

!

interface FastEthernet0/0

 ip address 12.12.12.1 255.255.255.0

 ip pim sparse-dense-mode

 ip ospf 1 area 0

 no shu

R2#

ip multicast-routing

!

interface Loopback0

 ip address 2.2.2.2 255.255.255.255

 ip pim sparse-dense-mode

 ip ospf 1 area 0

!

interface FastEthernet0/0

 ip address 12.12.12.2 255.255.255.0

 ip pim sparse-dense-mode

 ip ospf 1 area 0

 no shu

!

interface FastEthernet0/1

 ip address 23.23.23.2 255.255.255.0

 ip pim sparse-dense-mode

 ip ospf 1 area 0

 no shu

R3#

ip multicast-routing

!

interface Loopback0

 ip address 3.3.3.3 255.255.255.255

 ip pim sparse-dense-mode

 ip ospf 1 area 0

 no shu

!

interface FastEthernet0/0

 ip address 23.23.23.3 255.255.255.0

 ip pim sparse-dense-mode

 ip ospf 1 area 0

 no shu

For the testing interface lo0 in R1 will join group to ip multicast for example 239.0.0.1 and configure RP Candidate and RP mapping agent in one router. Actually it can be separated between RP Candidate and RP mapping agent.

R1#

int lo0

 ip igmp join-group 239.0.0.1

!

ip pim send-rp-announce loopback 0 scope 255

ip pim send-rp-discovery scope 255

Let’s verify the multicast

R1(config)#do sh ip pim rp map

PIM Group-to-RP Mappings

This system is an RP (Auto-RP)

This system is an RP-mapping agent

Group(s) 224.0.0.0/4

  RP 1.1.1.1 (?), v2v1

    Info source: 1.1.1.1 (?), elected via Auto-RP

         Uptime: 00:00:23, expires: 00:02:35

R2(config-if)#do sh ip pim rp map

PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4

  RP 1.1.1.1 (?), v2v1

    Info source: 12.12.12.1 (?), elected via Auto-RP

         Uptime: 00:00:03, expires: 00:02:53

R3(config-if)#do sh ip pim rp map

PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4

  RP 1.1.1.1 (?), v2v1

    Info source: 12.12.12.1 (?), elected via Auto-RP

         Uptime: 00:01:05, expires: 00:02:51

R3(config-if)#do sh ip mrou

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

(*, 239.0.0.1), 00:01:48/stopped, RP 1.1.1.1, flags: SPF

  Incoming interface: FastEthernet0/0, RPF nbr 23.23.23.2

  Outgoing interface list: Null

(3.3.3.3, 239.0.0.1), 00:00:28/00:03:10, flags: FT

  Incoming interface: Loopback0, RPF nbr 0.0.0.0, Registering

  Outgoing interface list:

    FastEthernet0/0, Forward/Sparse-Dense, 00:00:28/00:03:01

(23.23.23.3, 239.0.0.1), 00:00:30/00:02:38, flags: PFT

  Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0

  Outgoing interface list: Null

(*, 224.0.1.39), 00:02:12/stopped, RP 0.0.0.0, flags: D

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/0, Forward/Sparse-Dense, 00:02:12/00:00:00

(1.1.1.1, 224.0.1.39), 00:02:13/00:00:47, flags: PT

  Incoming interface: FastEthernet0/0, RPF nbr 23.23.23.2

  Outgoing interface list: Null

(*, 224.0.1.40), 00:02:33/stopped, RP 0.0.0.0, flags: DCL

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/0, Forward/Sparse-Dense, 00:02:32/00:00:00

    Loopback0, Forward/Sparse-Dense, 00:02:33/00:00:00

(12.12.12.1, 224.0.1.40), 00:01:13/00:02:56, flags: LT

  Incoming interface: FastEthernet0/0, RPF nbr 23.23.23.2

  Outgoing interface list:

    Loopback0, Forward/Sparse-Dense, 00:01:13/00:00:00

R3(config-if)#do ping 239.0.0.1 

Type escape sequence to abort.

Sending 1, 100-byte ICMP Echos to 239.0.0.1, timeout is 2 seconds:

Reply to request 0 from 12.12.12.1, 124 ms

Reply to request 0 from 12.12.12.1, 124 ms