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Friday, 15 March 2024

What is Auto-RP? How to configure Auto-RP?

What is Rendezvous's point?

The rendezvous point is a meeting point in the Multicast PIM sparse mode for all the multicast traffic. We have two ways to configure the Rendezvous point manually and automatically. Manual RP is for small networks and Auto RP is for large networks.

We have two discovery protocols for finding the Rendezvous point on the multicast network.

  1. Auto Rendezvous point (Auto-RP)
  2. PIMv2 bootstrap router (BSR)

What is Auto Rendezvous Point (Auto-RP)?

Auto Rendezvous Point (Auto-RP) Auto Rendezvous Point, also called Auto-RP, is a protocol used in Cisco networking devices to dynamically distribute multicast group information. Auto-RP is a legacy Cisco proprietary method of learning RP information on the PIM multicast network. Auto-RP used for router automatically learns RP address.

 

How Does Auto Rendezvous Point Work?

Auto-RP operates by designating a specific router as the rendezvous point (RP) for a multicast group. This RP is responsible for maintaining information about the multicast group members and facilitating multicast traffic distribution within the network. Through the Auto-RP protocol, routers can automatically discover the RP and establish communication paths for multicast traffic.

1.       Candidate Rendezvous Point generates advertisements using (S. 224.0.1.39) and groups with group information

2.       Mapping agent listens for (*,224.0.1.39) to learn about Rendezvous Point mappings.

3.       Mapping agent generates advertisement using (S,224.0.1.40) to distribute RP mapping information.

Benefits of Auto Rendezvous Point

Implementing Auto-RP in a network offers several advantages, including:

  • Simplified Configuration: Auto-RP automates determining the rendezvous point, eliminating the need for manual configuration and reducing the risk of human error.
  • Scalability: By efficiently managing multicast group information, Auto-RP ensures that multicast traffic is routed optimally, even in large networks with multiple multicast groups.
  • Improved Network Performance: With Auto-RP, routers can quickly adapt to changes in the network topology and ensure that multicast traffic is delivered efficiently and without delays.

 

 Topology:-


Goal:

  • configure the topology as per the diagram 
  • assign the IP addresses as per the topology 
  • enable Multicast routing on all the routers 
  • configure OSPF on all the routers
  • configure PIM sparse mode
  • configure manually IGMP multicast group membership on router 2 for testing.

  • configure the RP address on all the routers. 
  • configure Router 3 Loopback 0 to be RP and mapping agent for all multicast groups
  • advertise Loopback 0 13.0.0.1 in OSPF
  • Configure Auto-RP on all the routers
  • make sure all the routers can listen to Announcements

 


R1(config)#interface serial 4/0
R1(config-if)#ip address 1.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit

R1(config)#interface fastethernet 0/0
R1(config-if)#ip address 10.1.1.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#no keepalive
R1(config-if)#exit
 
R2(config)#interface serial 4/0
R2(config-if)#ip address 1.1.1.2 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface serial 4/1
R2(config-if)#ip address 2.2.2.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface fastEthernet 0/0
R2(config-if)#ip address 20.1.1.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#no keepalive
R2(config-if)#exit
 
R3(config)#interface serial 4/1
R3(config-if)#ip address 2.2.2.2 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface serial 4/2
R3(config-if)#ip address 3.3.3.1 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface fastethernet 0/0
R3(config-if)#ip address 30.1.1.1 255.0.0.0
R3(config-if)#no keepalive
R3(config-if)#no shutdown
R3(config-if)#exit
 
R4(config)#interface serial 4/2
R4(config-if)#ip address 3.3.3.2 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#exit

R4(config)#interface serial 4/4
R4(config-if)#ip address 5.5.5.2 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#exit

R4(config)#interface fastethernet 0/0
R4(config-if)#ip address 40.1.1.1 255.0.0.0
R4(config-if)#no shutdown
R4(config-if)#no keepalive
R4(config-if)#exit
 
R5(config)#interface serial 4/4
R5(config-if)#ip address 5.5.5.1 255.0.0.0
R5(config-if)#no shutdown
R5(config-if)#exit
R5(config)#interface fastethernet 0/0
R5(config-if)#ip address 50.1.1.1 255.0.0.0
R5(config-if)#no keepalive
R5(config-if)#no shutdown
R5(config-if)#exit
 

R1(config)#router ospf 1
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)#exit

*Mar  9 13:26:44.063: %OSPF-5-ADJCHG: Process 1, Nbr 20.1.1.1 on Serial4/0 from LOADING to FULL, Loading Done
*Mar  9 13:27:43.187: %OSPF-5-ADJCHG: Process 1, Nbr 40.1.1.1 on Serial4/3 from LOADING to FULL, Loading Done
 
R2(config)#router ospf 1
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

*Mar  9 13:26:44.079: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.1.1 on Serial4/0 from LOADING to FULL, Loading Done
*Mar  9 13:27:09.215: %OSPF-5-ADJCHG: Process 1, Nbr 30.1.1.1 on Serial4/1 from LOADING to FULL, Loading Done
 
R3(config)#router ospf 1
R3(config-router)#network 2.0.0.0 0.255.255.255 area 0
R3(config-router)#network 2.0.0.0 0.255.255.255 area 0
R3(config-router)#network 3.0.0.0 0.255.255.255 area 0
R3(config-router)#network 30.0.0.0 0.255.255.255 area 0
R3(config-router)#exit

*Mar  9 13:27:55.571: %OSPF-5-ADJCHG: Process 1, Nbr 40.1.1.1 on Serial4/2 from LOADING to FULL, Loading Done
*Mar  9 13:27:09.299: %OSPF-5-ADJCHG: Process 1, Nbr 20.1.1.1 on Serial4/1 from LOADING to FULL, Loading Done
 
 
R4(config)#router ospf 1
R4(config-router)#network 40.0.0.0 0.255.255.255 area 0
R4(config-router)#network 3.0.0.0 0.255.255.255 area 0
R4(config-router)#network 5.0.0.0 0.255.255.255 area 0
R4(config-router)#exit

*Mar  9 13:27:55.763: %OSPF-5-ADJCHG: Process 1, Nbr 30.1.1.1 on Serial4/2 from LOADING to FULL, Loading Done
*Mar  9 13:28:44.047: %OSPF-5-ADJCHG: Process 1, Nbr 50.1.1.1 on Serial4/4 from LOADING to FULL, Loading Done
 
R5(config)#router ospf 1
R5(config-router)#network 5.0.0.0 0.255.255.255 area 0
R5(config-router)#network 50.0.0.0 0.255.255.255 area 0
R5(config-router)#exit
*Mar  9 13:28:43.951: %OSPF-5-ADJCHG: Process 1, Nbr 40.1.1.1 on Serial4/4 from LOADING to FULL, Loading Done


R1(config)#ip multicast-routing

R1(config)#interface serial 4/0
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

*Mar  9 13:32:17.003: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 10.1.1.1 on interface FastEthernet0/0
*Mar  9 13:32:57.099: %PIM-5-NBRCHG: neighbor 1.1.1.2 UP on interface Serial4/0
R2(config)#ip multicast-routing

R2(config)#interface serial 4/0
R2(config-if)#ip pim sparse-mode
R2(config-if)#exit

R2(config)#interface serial 4/1
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

*Mar  9 13:32:57.135: %PIM-5-NBRCHG: neighbor 1.1.1.1 UP on interface Serial4/0
*Mar  9 13:33:39.063: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 20.1.1.1 on interface FastEthernet0/0
*Mar  9 13:34:17.039: %PIM-5-NBRCHG: neighbor 2.2.2.2 UP on interface Serial4/1

R3(config)#ip multicast-routing

R3(config)#interface serial 4/1
R3(config-if)#ip pim sparse-mode
R3(config-if)#exit

R3(config)#interface serial 4/2
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

*Mar  9 13:34:53.087: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 30.1.1.1 on interface FastEthernet0/0
*Mar  9 13:34:17.139: %PIM-5-NBRCHG: neighbor 2.2.2.1 UP on interface Serial4/1
*Mar  9 13:35:33.479: %PIM-5-NBRCHG: neighbor 3.3.3.2 UP on interface Serial4/2

R4(config)#ip multicast-routing

R4(config)#interface serial 4/2
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

R4(config)#interface serial 4/4
R4(config-if)#ip pim sparse-mode
R4(config-if)#exit

*Mar  9 13:37:22.723: %PIM-5-NBRCHG: neighbor 5.5.5.1 UP on interface Serial4/4
*Mar  9 13:35:33.647: %PIM-5-NBRCHG: neighbor 3.3.3.1 UP on interface Serial4/2
*Mar  9 13:36:12.595: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 40.1.1.1 on interface FastEthernet0/0


R5(config)#ip multicast-routing
R5(config)#interface serial 4/4
R5(config-if)#ip pim sparse-mode
R5(config-if)#exit
 
R5(config)#interface fastethernet 0/0
R5(config-if)#ip pim sparse-mode
R5(config-if)#exit

*Mar  9 13:37:46.543: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 50.1.1.1 on interface FastEthernet0/0
*Mar  9 13:37:22.611: %PIM-5-NBRCHG: neighbor 5.5.5.2 UP on interface Serial4/4


R1#show ip pim interface

Address          Interface                Ver/   Nbr    Query  DR     DR
                                          Mode   Count  Intvl  Prior
1.1.1.1          Serial4/0                v2/S   1      30     1      0.0.0.0
10.1.1.1         FastEthernet0/0          v2/S   0      30     1      10.1.1.1

R1#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
1.1.1.2           Serial4/0                00:07:37/00:01:27 v2    1 / S P

R2#show ip pim interface

Address          Interface                Ver/   Nbr    Query  DR     DR
                                          Mode   Count  Intvl  Prior
1.1.1.2          Serial4/0                v2/S   1      30     1      0.0.0.0
2.2.2.1          Serial4/1                v2/S   1      30     1      0.0.0.0
20.1.1.1         FastEthernet0/0          v2/S   0      30     1      20.1.1.1

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
1.1.1.1           Serial4/0                00:08:03/00:01:32 v2    1 / S P
2.2.2.2           Serial4/1                00:06:43/00:01:24 v2    1 / S P



R4#show ip pim interface

Address          Interface                Ver/   Nbr    Query  DR     DR
                                          Mode   Count  Intvl  Prior
3.3.3.2          Serial4/2                v2/S   1      30     1      0.0.0.0
40.1.1.1         FastEthernet0/0          v2/S   0      30     1      40.1.1.1
5.5.5.2          Serial4/4                v2/S   1      30     1      0.0.0.0

R4#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
3.3.3.1           Serial4/2                00:06:02/00:01:35 v2    1 / S P
5.5.5.1           Serial4/4                00:04:13/00:01:26 v2    1 / S P


R3(config)#interface loopback 0
R3(config-if)#ip address 13.0.0.1 255.255.255.0
R3(config-if)#exit

R3(config)#interface loopback 0
R3(config-if)#ip pim sparse-mode

R3(config-if)#ip pim send-rp-announce loopback 0 scope 10
R3(config)#ip pim send-rp-discovery loopback 0 scope 10
R3(config)#end

R3(config)#interface fastEthernet 0/0
R3(config-if)#ip igmp join-group 224.5.5.5
R3(config-if)#exit

R3(config)#router ospf 1
R3(config-router)#network 13.0.0.0 255.0.0.0 area 0
R3(config-router)#exit

R1(config)#ip pim autorp listener
R1(config)#end
R2(config)#ip pim autorp listener
R2(config)#end
R3(config)#ip pim autorp listener
R3(config)#end
R4(config)#ip pim autorp listener
R4(config)#end
R5(config)#ip pim autorp listener
R5(config)#end

R1#show ip pim rp mapping
PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4
  RP 13.0.0.1 (?), v2v1
    Info source: 13.0.0.1 (?), elected via Auto-RP
         Uptime: 00:40:34, expires: 00:02:58

R1#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,
       V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.0.1.39), 00:40:38/stopped, RP 0.0.0.0, flags: D
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial4/0, Forward/Sparse, 00:40:38/00:00:00

(13.0.0.1, 224.0.1.39), 00:00:48/00:02:11, flags: PT
  Incoming interface: Serial4/0, RPF nbr 1.1.1.2
  Outgoing interface list: Null

(*, 224.0.1.40), 00:44:37/stopped, RP 0.0.0.0, flags: DCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial4/0, Forward/Sparse, 00:44:37/00:00:00

(13.0.0.1, 224.0.1.40), 00:40:40/00:02:51, flags: PLTX
  Incoming interface: Serial4/0, RPF nbr 1.1.1.2
  Outgoing interface list: Null


R5#show ip pim rp mapping
PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4
  RP 13.0.0.1 (?), v2v1
    Info source: 13.0.0.1 (?), elected via Auto-RP
         Uptime: 00:41:26, expires: 00:02:01

R5#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,
       V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.0.1.39), 00:41:29/stopped, RP 0.0.0.0, flags: D
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial4/4, Forward/Sparse, 00:41:29/00:00:00

(13.0.0.1, 224.0.1.39), 00:01:39/00:01:20, flags: PT
  Incoming interface: Serial4/4, RPF nbr 5.5.5.2
  Outgoing interface list: Null

(*, 224.0.1.40), 00:44:31/stopped, RP 0.0.0.0, flags: DCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Serial4/4, Forward/Sparse, 00:44:31/00:00:00

(13.0.0.1, 224.0.1.40), 00:41:30/00:02:01, flags: PLTX
  Incoming interface: Serial4/4, RPF nbr 5.5.5.2
  Outgoing interface list: Null

R1#ping 224.5.5.5 repeat 100

Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 224.5.5.5, timeout is 2 seconds:

Reply to request 0 from 2.2.2.2, 56 ms
Reply to request 0 from 2.2.2.2, 56 ms
Reply to request 1 from 2.2.2.2, 72 ms
Reply to request 1 from 2.2.2.2, 96 ms
Reply to request 1 from 2.2.2.2, 96 ms
Reply to request 1 from 2.2.2.2, 72 ms
Reply to request 2 from 2.2.2.2, 88 ms
Reply to request 2 from 2.2.2.2, 108 ms
Reply to request 3 from 2.2.2.2, 68 ms
Reply to 

R1#show ip pim autorp
AutoRP Information:
  AutoRP is enabled.
  AutoRP groups over sparse mode interface is enabled

PIM AutoRP Statistics: Sent/Received
  RP Announce: 0/0, RP Discovery: 0/51


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