Example for Configuring Anycast RP

Owned by Tracy Yang (Unlicensed)
Mar 03, 2023
5 min read

Network Requirement

As shown in Figure 1, in the PIM-SM domain, the multicast source sends multicast data to group 238.0.0.1, and Host A and Host B are members of this multicast group.

Figure 1 Network Diagram for Configuring Anycast RP

Apply Anycast RP in the PIM-SM domain to achieve load sharing and backup among multiple RPs.

  1. Select Switch 2 and Switch 3 as the anycast RPs in the PIM-SM domain.
  2. Prepare a loopback interface address respectively on Switch 2 and Switch 3 with the same value.
  3. Configure the RP. Configure static RP on each PIM-SM router in the whole domain, specifying the loopback interface address of Switch 2 and Switch 3 as the RP address.
  4. Prepare another loopback interface address on Switch 2 and Switch 3 respectively, which will be used to establish MSDP peer connection. Do not use the loopback interface address used for the RP.
  5. Use the following command lines to establish the MSDP peer connection between Switch 2 and Switch 3.

set protocols msdp mesh-group < mesh-group-name> member <peer-address>

set protocols msdp mesh-group < mesh-group-name> source <source-address>

Procedure

Switch 1

admin@Switch1# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 13 
admin@Switch1# set interface gigabit-ethernet ge-1/1/10 family ethernet-switching native-vlan-id 200 
admin@Switch1# set interface gigabit-ethernet ge-1/1/23 family ethernet-switching native-vlan-id 12 
admin@Switch1# set ip routing enable true 
admin@Switch1# set l3-interface vlan-interface vlan12 address 10.0.12.1 prefix-length 24 
admin@Switch1# set l3-interface vlan-interface vlan200 address 200.200.200.1 prefix-length 24 
admin@Switch1# set l3-interface vlan-interface vlan13 address 10.0.13.1 prefix-length 24 
admin@Switch1# set protocols ospf router-id 1.1.1.1 
admin@Switch1# set protocols ospf network 10.0.12.0/24 area 0.0.0.0 
admin@Switch1# set protocols ospf network 200.200.200.0/24 area 0 
admin@Switch1# set protocols ospf network 10.0.13.0/24 area 0 
admin@Switch1# set protocols ospf interface vlan13 cost 15 
admin@Switch1# set protocols pim rp 6.6.6.6 group 224.0.0.0/4 
admin@Switch1# set protocols pim interface vlan12 
admin@Switch1# set protocols pim interface vlan200 
admin@Switch1# set protocols pim interface vlan13 
admin@Switch1# set vlans vlan-id 12 l3-interface vlan12 
admin@Switch1# set vlans vlan-id 13 l3-interface vlan13
admin@Switch1# set vlans vlan-id 200 l3-interface vlan200
admin@Switch1# commit

Switch 2

admin@Switch2# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching native-vlan-id 12 
admin@Switch2# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching native-vlan-id 24 
admin@Switch2# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 23 
admin@Switch2# set ip routing enable true 
admin@Switch2# set l3-interface loopback lo address 2.2.2.2 prefix-length 32 
admin@Switch2# set l3-interface loopback lo address 6.6.6.6 prefix-length 32 
admin@Switch2# set l3-interface vlan-interface vlan24 address 10.0.24.2 prefix-length 24
admin@Switch2# set l3-interface vlan-interface vlan12 address 10.0.12.2 prefix-length 24 
admin@Switch2# set l3-interface vlan-interface vlan23 address 10.0.23.2 prefix-length 24 
admin@Switch2# set protocols msdp mesh-group 6.6.6.6 member 3.3.3.3 
admin@Switch2# set protocols msdp mesh-group 6.6.6.6 source 2.2.2.2 
admin@Switch2# set protocols spanning-tree enable false 
admin@Switch2# set protocols ospf router-id 2.2.2.2 
admin@Switch2# set protocols ospf network 10.0.12.0/24 area 0 
admin@Switch2# set protocols ospf network 10.0.24.0/24 area 0 
admin@Switch2# set protocols ospf network 2.2.2.2/32 area 0
admin@Switch2# set protocols ospf network 10.0.23.0/24 area 0 
admin@Switch2# set protocols ospf network 6.6.6.6/32 area 0
admin@Switch2# set protocols pim rp 6.6.6.6 group 224.0.0.0/4 
admin@Switch2# set protocols pim interface vlan12
admin@Switch2# set protocols pim interface vlan24 
admin@Switch2# set protocols pim interface lo 
admin@Switch2# set protocols pim interface vlan23 
admin@Switch2# set vlans vlan-id 12 l3-interface vlan12 
admin@Switch2# set vlans vlan-id 23 l3-interface vlan23
admin@Switch2# set vlans vlan-id 24 l3-interface vlan24
admin@Switch2# commit

Switch 3

admin@Switch3# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching native-vlan-id 13 
admin@Switch3# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching native-vlan-id 34 
admin@Switch3# set interface gigabit-ethernet ge-1/1/7 family ethernet-switching native-vlan-id 35 
admin@Switch3# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 23 
admin@Switch3# set ip routing enable true
admin@Switch3# set l3-interface loopback lo address 3.3.3.3 prefix-length 32 
admin@Switch3# set l3-interface loopback lo address 6.6.6.6 prefix-length 32 
admin@Switch3# set l3-interface vlan-interface vlan34 address 10.0.34.3 prefix-length 24 
admin@Switch3# set l3-interface vlan-interface vlan13 address 10.0.13.3 prefix-length 24 
admin@Switch3# set l3-interface vlan-interface vlan23 address 10.0.23.3 prefix-length 24 
admin@Switch3# set l3-interface vlan-interface vlan35 address 10.0.35.3 prefix-length 24 
admin@Switch3# set protocols msdp mesh-group 6.6.6.6 member 2.2.2.2
admin@Switch3# set protocols msdp mesh-group 6.6.6.6 source 3.3.3.3
admin@Switch3# set protocols ospf router-id 3.3.3.3 
admin@Switch3# set protocols ospf network 10.0.34.0/24 area 0.0.0.0 
admin@Switch3# set protocols ospf network 6.6.6.6/32 area 0
admin@Switch3# set protocols ospf network 3.3.3.3/32 area 0 
admin@Switch3# set protocols ospf network 10.0.13.0/24 area 0 
admin@Switch3# set protocols ospf network 10.0.23.0/24 area 0 
admin@Switch3# set protocols ospf network 10.0.35.0/24 area 0 
admin@Switch3# set protocols pim rp 6.6.6.6 group 224.0.0.0/4 
admin@Switch3# set protocols pim interface vlan34
admin@Switch3# set protocols pim interface lo 
admin@Switch3# set protocols pim interface vlan13 
admin@Switch3# set protocols pim interface vlan23 
admin@Switch3# set protocols pim interface vlan35 
admin@Switch3# set vlans vlan-id 13 l3-interface vlan13
admin@Switch3# set vlans vlan-id 23 l3-interface vlan23 
admin@Switch3# set vlans vlan-id 34 l3-interface vlan34 
admin@Switch3# set vlans vlan-id 35 l3-interface vlan35 
admin@Switch3# commit

Switch 4

admin@Switch4# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 24 
admin@Switch4# set interface gigabit-ethernet te-1/1/2 family ethernet-switching native-vlan-id 34 
admin@Switch4# set interface gigabit-ethernet te-1/1/10 family ethernet-switching native-vlan-id 100 
admin@Switch4# set ip routing enable true 
admin@Switch4# set l3-interface vlan-interface vlan24 address 10.0.24.4 prefix-length 24 
admin@Switch4# set l3-interface vlan-interface vlan34 address 10.0.34.4 prefix-length 24 
admin@Switch4# set l3-interface vlan-interface vlan100 address 100.100.100.1 prefix-length 24 
admin@Switch4# set protocols igmp interface vlan100
admin@Switch4# set protocols ospf router-id 4.4.4.4 
admin@Switch4# set protocols ospf network 10.0.24.0/24 area 0 
admin@Switch4# set protocols ospf network 10.0.34.0/24 area 0 
admin@Switch4# set protocols ospf network 100.100.100.0/24 area 0
admin@Switch4# set protocols ospf interface vlan34 cost 15
admin@Switch4# set protocols pim rp 6.6.6.6 group 224.0.0.0/4 
admin@Switch4# set protocols pim interface vlan24
admin@Switch4# set protocols pim interface vlan34
admin@Switch4# set protocols pim interface vlan100
admin@Switch4# set vlans vlan-id 24 l3-interface vlan24
admin@Switch4# set vlans vlan-id 34 l3-interface vlan34
admin@Switch4# set vlans vlan-id 100 l3-interface vlan100
admin@Switch4# commit

Switch 5

admin@Switch5# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching native-vlan-id 101 
admin@Switch5# set interface gigabit-ethernet ge-1/1/7 family ethernet-switching native-vlan-id 35 
admin@Switch5# set l3-interface vlan-interface vlan35 address 10.0.35.5 prefix-length 24 
admin@Switch5# set l3-interface vlan-interface vlan101 address 101.101.101.1 prefix-length 24 
admin@Switch5# set protocols igmp interface vlan101
admin@Switch5# set protocols ospf router-id 5.5.5.5 
admin@Switch5# set protocols ospf network 10.0.35.0/24 area 0 
admin@Switch5# set protocols pim rp 6.6.6.6 group 224.0.0.0/4 
admin@Switch5# set protocols pim interface vlan35 
admin@Switch5# set protocols pim interface vlan101 
admin@Switch5# set vlans vlan-id 35 l3-interface vlan35 
admin@Switch5# set vlans vlan-id 101 l3-interface vlan101
admin@Switch5# commit

Verify the Configuration

  • You can use command run show msdp mesh-group to check the establishment state for MSDP peers.
admin@Switch2# run show msdp mesh-group
Mesh group : 6.6.6.6
  Source : 2.2.2.2
  Member         State
  3.3.3.3          established
  • You can use command run show msdp peer command to view the detail information about the remote MSDP peer.
admin@Switch2# run show msdp peer detail
Peer : 3.3.3.3
  Local               : 2.2.2.2
  Mesh Group          : 6.6.6.6
  State               : established
  Uptime              : 06:10:52
  Keepalive Timer     : 00:00:08
  Conn Retry Timer    : --:--:--
  Hold Timer          : 00:00:46
  Last Reset          : -
  Conn Attempts       : 22
  Established Changes : 1
  SA Count            : 2
  Statistics          :
                       Sent       Rcvd
    Keepalives :        371          4
  SAs        :          0        748
  • You can view PIM routes on the switches by using the run show mroute Multicast source 200.200.200.2 in the PIM-SM domain sends multicast data to multicast group 238.0.0.1, and Host A joins multicast group 238.0.0.1 to receive multicast data sent to group 238.0.0.1.

By comparing the PIM routes on Switch 2, Switch 3 and Switch 4, we can see that the current valid RP is Switch 2: the multicast source registers with Switch 2 and Host A joins Switch 2. No PIM routes are displayed on Switch 3.

admin@Switch2# run show mroute
IP Multicast Routing Table
Flags: S - Sparse, C - Connected, P - Pruned
       R - RP-bit set, F - Register flag, T - SPT-bit set

Source          Group          Flags   Proto   Input            Output           TTL  Uptime
*               238.0.0.1       S       PIM    lo               vlan24           1    00:04:35
200.200.200.2   238.0.0.1       ST      STAR   vlan12           vlan24           1    00:04:37

admin@Switch3# run show mroute
IP Multicast Routing Table
Flags: S - Sparse, C - Connected, P - Pruned
       R - RP-bit set, F - Register flag, T - SPT-bit set

Source          Group           Flags   Proto  Input            Output           TTL  Uptime


admin@Switch4# run show mroute
IP Multicast Routing Table
Flags: S - Sparse, C - Connected, P - Pruned
       R - RP-bit set, F - Register flag, T - SPT-bit set

Source          Group          Flags   Proto   Input            Output          TTL  Uptime
*               238.0.0.1       SC     IGMP   vlan24           vlan100          1    02:00:31
  • You can view the RP information by using the run show pim rp-info command.
admin@Switch2# run show pim rp-info
RP address       group/prefix-list   OIF               I am RP    Source
6.6.6.6          224.0.0.0/4         lo                yes        Static

admin@Switch3#run show pim rp-info
RP address       group/prefix-list   OIF               I am RP    Source
6.6.6.6          224.0.0.0/4         lo                yes        Static

admin@Switch4#run show pim rp-info
RP address       group/prefix-list   OIF               I am RP    Source
6.6.6.6          224.0.0.0/4         vlan24            no        Static

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