How to configure PIM-DM on Omada L3 Switch via Omada Controller

Contents

Requirements

Objective

Introduction

PIM-DM Configuration

Verification

Conclusion

Requirements

• Omada Controller (Software Controller / Hardware Controller / Cloud Based Controller, v5.9 and above)
• Omada L3 switches

Objective

This article focuses on how to configure the PIM-DM function on the Omada L3 switches via Omada Controller.

Introduction

The Protocol Independent Multicast (PIM) provides routing for IP multicast using unicast static routing or unicast routing tables generated by any unicast routing protocol. Independent of the unicast routing protocol used, multicast routing serves to generate corresponding multicast routing table entries through unicast routing protocol.

PIM-DM, a dense-mode multicast routing protocol that uses the Push mode to transmit multicast data, is suitable for small networks with dense multicast group members.

Typical scenario for PIM-DM application:

The Source sends 16 channels of multicast data streams (235.0.0.51~235.0.0.66). Now Host A wants to join the group 235.0.0.51, and Host C wants to join the group 235.0.0.52.

Device	Interface	IP Address	VLAN
Switch A	GE 1/0/1	10.110.1.1/24	100
	GE 1/0/2	192.168.11.1/24	101
Switch B	GE 1/0/1	10.110.2.1/24	200
	GE 1/0/2	192.168.12.1/24	102
Switch C	GE 1/0/1	10.110.2.2/24	200
	GE 1/0/2	192.168.13.1/24	103
Switch D	GE 1/0/1	10.110.5.1/24	300
	GE 1/0/2	192.168.11.2/24	101
	GE 1/0/3	192.168.12.2/24	102
	GE 1/0/4	192.168.13.2/24	103

Video-on-demand streams are sent to receiver hosts in multicast. Receiver groups from different organizations form the stub networks, in each of which there is at least one receiver. The entire PIM domain uses the DM mode.

Host A and Host C are multicast receivers on two stub networks; Switch D is connected to the network where the multicast source (Source) is located through GE 1/0/1; Switch A is connected to the stub network N1 through GE 1/0/1 and to Switch D through the GE 1/0/2; Switch B and Switch C are connected to the stub network N2 through their respective GE 1/0/1 interfaces, and are connected to Switch D through their respective GE 1/0/2 interfaces.

IGMP runs between Switch A and stub network N1; it also runs between Switch B/C and stub network N2.

PIM-DM Configuration

Before proceeding with the following configurations, configure the IP address and subnet mask of each interface and ensure that the routing is reachable between devices within the PIM-DM domain.

Then configure the unicast routing protocol within the domain to ensure reachability of each subnet. For more information, please refer to the RIP/OSPF configuration guide.

Step 1. Configure the unicast routing protocol within the domain to ensure reachability of each subnet. For more information, please refer to the RIP/OSPF configuration guide.

Step 2. Log in to the Controller and go to Setting > CLI configuration > Device CLI > Create New Device CLI profile.

Step 3. Send the following commands separately to Switch A, Switch B, and Switch C:

Switch A:

ip multicast-routing

ip igmp

ip pim dense-mode

interface vlan 101

ip pim

interface vlan 100

ip pim

ip igmp

Switch B:

ip multicast-routing

ip igmp

ip pim dense-mode

interface vlan 102

ip pim

interface vlan 200

ip pim

ip igmp

Switch C:

ip multicast-routing

ip igmp

ip pim dense-mode

interface vlan 103

ip pim

interface vlan 200

ip pim

ip igmp

Note: IGMP Querier Election: The switch with the smaller IP address will become the IGMP querier. When multiple PIM upstream routers exist within a subnet, an Assert Winner election will occur. If the route priority and cost are the same, the switch with the larger IP address will elected as the Assert Winner. The multicast data stream will be forwarded downstream to clients by the Assert Winner.

In the topology, there is an IGMP Querier and PIM Assert Winner election between Switch B and Switch C. According to the configuration in the sample topology, Switch B becomes the IGMP Querier, and Switch C becomes the Assert Winner that forwards the multicast stream to the group members in Network 2.

After configuring the switches connected to the stub networks, you need to enable PIM on other switches within the PIM domain (only Switch D in the sample topology). We take Switch D as an example to demonstrate the configuration.

Step 4. Go to Setting > CLI configuration > Device CLI > Create New Device CLI profile.

Step 5. Send the following commands to Switch D:

ip multicast-routing

ip pim dense-mode

interface vlan 101

ip pim

interface vlan 102

ip pim

interface vlan 103

ip pim

interface vlan 300

ip pim

Verification

Step 1. Log in to Controller, Go to Tools>Terminal, select Switch as Device Type, and choose Switch A/B/C/D as Sources. Then click Open Terminal to connect to Switches via SSH. You could switch SSH terminals of different switches by Device List.

Step 2. Checking Mroute table and PIM DM neighbors on Switch D:

There are a total of 16 channels in the Mroute table.

There are 3 PIM DM neighbors.

Step 3. Checking multicast flow forwarding on Switch A:

Switch A forwards the data stream of channel 235.0.0.51 to the VLAN100 where Host A is located.

Step 4. Checking Querier election result and IGMP group formation on Switch B:

Result: Switch B is elected as the Querier.

IGMP group formation on Switch B:

Step 5. Checking multicast flow forwarding on Switch C:

Switch C, the PIM Assert Winner, forwards the data stream of channel 235.0.0.52 to Host C.

Conclusion

You have finish all the configuration of PIM-DM via Omada Controller, it should work properly now.

Get to know more details of each function and configuration please go to Download Center to download the manual of your product.