Maipu Administration Guide

Configure Unknown Multicast Re-direction

Network Requirements

Device2 configures multicast routing protocol.
Device1 enables IGMP snooping, unknown multicast dropping, and unknown multicast re-direction.
Multicast Server sends the multicast service packet; PC1 can correctly receive the multicast service packet.

Network Topology

Network topology of configuring unknown multicast re-direction

Figure 2-4 Network topology of configuring unknown multicast re-direction

Configuration Steps

Step 1: Configure the IP address of Device2 interface. (omitted)

Step 2: Enable PIM-SM on the interfaces of Device2, and enable IGMP snooping and unknown multicast re-direction on Device1.

#On Device2, configure the link type of port gigabitethernet0/2 as Access, permitting VLAN3 services to pass, configure the link type of port gigabitethernet0/1 as trunk, permitting VLAN2 service to pass, and configure PVID as 1.

Device2(config)#vlan2-3
Device2(config)#interface gigabitethernet 0/2
Device2(config-if-gigabitethernet0/2)#switchport access vlan 3
Device2(config-if-gigabitethernet0/2)#exit
Device2(config)#interface gigabitethernet 0/1
Device2(config-if-gigabitethernet0/1)#switchport mode trunk
Device2(config-if-gigabitethernet0/1)#switchport trunk allowed vlan add 2
Device2(config-if-gigabitethernet0/1)#switchport trunk pvid vlan 1
Device2(config-if-gigabitethernet0/1)#exit

#Globally enable multicast forwarding on Device2, and enable PIM-SM on the related interfaces.

Device2(config)#ip multicast-routing
Device2(config)#interface vlan2
Device2(config-if-vlan2)#ip pim sparse-mode
Device2(config-if-vlan2)#exit
Device2(config)#interface vlan3
Device2(config-if-vlan2)#ip pim sparse-mode
Device2(config-if-vlan3)#exit

#On Device1, configure the link type of port gigabitethernet0/2 as Access, permitting VLAN2 services to pass, configure the link type of port gigabitethernet0/1 as trunk, permitting VLAN2 service to pass, and configure PVID as 1.

Device1(config)#interface gigabitethernet 0/2
Device1(config-if-gigabitethernet0/2)# switchport access vlan 2
Device1(config-if-gigabitethernet0/2)#exit
Device1(config)#interface gigabitethernet 0/1
Device1(config-if-gigabitethernet0/1)#switchport mode trunk
Device1(config-if-gigabitethernet0/1)#switchport trunk allowed vlan add 2
Device1(config-if-gigabitethernet0/1)#switchport trunk pvid vlan 1
Device1(config-if-gigabitethernet0/1)#exit

#In VLAN2, enable unknown multicast dropping.

Device1(config)#vlan 2
Device1(config-vlan2)#l2-multicast drop-unknown
Device1(config-vlan2)#l3-multicast drop-unknown
Device1(config-vlan2)#exit

#Enable IGMP snooping.

Device1(config)#ip igmp snooping
Device1(config)#ip igmp snooping vlan 2

#In VLAN2, enable unknown multicast re-direction.

Device1(config)#vlan 2
Device1(config-vlan2)#multicast mrouter-forwarding
Device1(config-vlan2)#exit

Step 3: Check the result.

#View the IGMP snooping router ports (uplink ports) learned on Device1.

Device1#show ip igmp snooping mrouter  
Vlan   SourceAddr    Expires     Interface 
----   ----------    -------     --------- 
2      192.168.1.1   00:04:04    gigabitethernet0/1(dynamic)

#PC1 sends IGMPv2 member report packets to join multicast group 224.1.1.1.

#Query the multicast member table of Device2.

Device2#show ip igmp groups  
IGMP Connected Group Membership
Total 1 groups 
Group Address  Interface   Uptime    Expires   Last Reporter  V1 Expires V2 Expires 
-----------------------------------------------------------------------------------
224.1.1.1      vlan3       00:21:02  00:03:47  192.168.1.2    stopped

#Multicast server sends the multicast service packet whose destination address is 224.1.1.1. PC1. View the multicast route table entries on Device2.

Device2#show ip pim mroute
IP Multicast Routing Table:
PIM VRF Name: Default
Total 0 (*,*,RP) entry
Total 1 (*,G) entry 
Total 1 (S,G) entry
Total 1 (S,G,rpt) entry
Total 0 FCR entry 
Up timer/Expiry timer 
 
(*, 224.1.1.1) 
Up time: 00:08:12
RP: 0.0.0.0 
RPF nbr: 0.0.0.0
RPF idx: None
Flags: 
  JOIN DESIRED 
Upstream State: JOINED 
  Local interface list: 
    vlan3 
  Joined interface list: 
  Asserted interface list: 
 
(192.168.1.100, 224.1.1.1) 
Up time: 00:07:24
KAT time: 00:02:22
RPF nbr: 0.0.0.0
RPF idx: None 
SPT bit: TRUE
Flags: 
  JOIN DESIRED 
  COULD REGISTER 
Upstream State: JOINED 
  Local interface list: 
  Joined interface list: 
    register_vif0 
 
  Asserted interface list: 
  Outgoing interface list: 
    register_vif0 
    vlan3 
  Packet count 8646421 
 
(192.168.1.100, 224.1.1.1, rpt) 
Up time: 00:07:24
RP: 0.0.0.0 
Flags: 
  RPT JOIN DESIRED 
  RPF SGRPT XG EQUAL 
Upstream State: NOT PRUNED 
  Local interface list: 
  Pruned interface list: 
  Outgoing interface list: vlan3

#PC1 can correctly receive the multicast service packets sent by Multicast Server.