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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Applications

Applications

This section describes the applicable scenario of IP multicast.

Multicast Deployment on an IPv4 Network

This section describes typical multicast service scenarios on an IPv4 network and applications of multicast protocols.

Configure multicast services based on the actual situations and service requirements on your network. This section provides only deployment of basic multicast services.

NOTE:

Before deploying IPv4 multicast services on a network, ensure that IPv4 unicast routes on the network are reachable.

Multicast Within a PIM Domain

On a small-scale network, all network devices and hosts belong to the same PIM domain. Figure 8-7 shows the multicast service deployment in this scenario.

Figure 8-7 Multicast service deployment within a PIM domain

Table 8-10 Multicast protocols used for multicast within a PIM domain

Protocol

Application Position

Purpose

PIM (mandatory)

PIM must be configured on all interfaces of Layer 3 multicast devices in the PIM domain, including all interfaces of RouterA, RouterB, and RouterC.

For the configuration procedure, see PIM (IPv4) Configuration.

PIM sends multicast data from the multicast source to RouterB and RouterC connected to multicast receivers.

IGMP (mandatory)

IGMP must be configured on user-side interfaces of Layer 3 multicast devices RouterB and RouterC.

For the configuration procedure, see IGMP Configuration.

IGMP allows receiver hosts to join or leave multicast groups, and allows RouterB and RouterC to maintain and manage multicast memberships.

IGMP snooping and IGMP snooping proxy (optional)

IGMP snooping and IGMP snooping proxy must be configured in VLANs on SwitchA, a device between a Layer 3 multicast device and user hosts.

For the configuration procedure, see IGMP Snooping Configuration.

IGMP snooping listens to IGMP packets exchanged between RouterB and HostA to create and maintain a Layer 2 multicast forwarding table. In this manner, SwitchA can control forwarding of multicast data packets on the Layer 2 network.

IGMP snooping proxy allows SwitchA to substitute for RouterB to send IGMP Query messages and substitute hosts to send IGMP Report/Leave messages.

Multicast Between PIM-SM Domains

A multicast domain can be divided into multiple isolated PIM-SM domains to facilitate management of multicast resources, including multicast groups, multicast sources, and group members. To enable the PIM-SM domains to exchange multicast data, MSDP needs to be deployed between the PIM-SM domains, as shown in Figure 8-8.

NOTE:

MSDP is not required when PIM-SM uses the SSM model.

Figure 8-8 Multicast service deployment between PIM-SM domains

Table 8-11 Multicast protocols used for multicast between PIM-SM domains

Protocol

Application Position

Purpose

PIM-SM (mandatory)

PIM-SM must be configured on all interfaces of Layer 3 multicast devices in the PIM-SM domains, including all interfaces of Routers A to F.

For the configuration procedure, see Configuring PIM-SM (IPv4).

PIM-SM sends multicast data from multicast sources Source1 and Source2 to RouterF connected to multicast receivers. Receiver hosts proactively join a multicast group, and multicast data is forwarded to the receiver hosts through rendezvous points (RPs) in the PIM-SM domains.

IGMP (mandatory)

IGMP must be configured on user-side interfaces of Layer 3 multicast device RouterF in the PIM-SM domains.

For the configuration procedure, see IGMP Configuration.

IGMP allows receiver hosts to join or leave multicast groups, and allows RouterF to maintain and manage multicast memberships.

MSDP (mandatory)

MSDP must be configured on the RP in each PIM-SM domain, that is, RouterC and RouterD.

For the configuration procedure, see MSDP Configuration.

MSDP transmits multicast data between PIM-SM1 and PIM-SM2. Host in PIM-SM2 can receive data from Source1.

IGMP snooping and IGMP snooping proxy (optional)

IGMP snooping and IGMP snooping proxy must be configured in VLANs on SwitchA, a device between a Layer 3 multicast device and user hosts.

For the configuration procedure, see IGMP Snooping Configuration.

IGMP snooping listens to IGMP messages exchanged between RouterF and hosts to create and maintain a Layer 2 multicast forwarding table. In this manner, SwitchA can control forwarding of multicast data packets on the Layer 2 network.

IGMP snooping proxy allows SwitchA to substitute for RouterF to send IGMP Query messages and substitute hosts to send IGMP Report/Leave messages.

Inter-AS Multicast
PIM forwards multicast data based on a unicast routing table; therefore, multicast forwarding paths are the same as unicast forwarding paths. When a multicast source and receivers are located in different ASs, a multicast distribution tree needs to be set up between the ASs. In this scenario, MBGP can be used to create a multicast routing table independent of the unicast routing table. Then multicast data is transmitted based on the multicast routing table. Figure 8-9 shows the deployment of inter-AS multicast service deployment.
NOTE:

Before configuring MBGP between ASs, configure BGP between the ASs.

Figure 8-9 Inter-AS multicast service deployment

Table 8-12 Multicast protocols used for inter-AS multicast

Protocol

Application Position

Purpose

PIM-SM (mandatory)

PIM-SM must be configured on all interfaces of Layer 3 multicast devices in the PIM-SM domains, including all interfaces of Routers A to H.

For the configuration procedure, see Configuring PIM-SM (IPv4).

PIM-SM sends multicast data from multicast sources Source1 and Source2 to RouterB and RouterH connected to multicast receivers. Receiver hosts proactively join a multicast group, and multicast data is forwarded to the receiver hosts through RPs in the PIM-SM domains.

IGMP (mandatory)

IGMP must be configured on user-side interfaces of Layer 3 multicast devices RouterB and RouterH in the PIM-SM domains.

For the configuration procedure, see IGMP Configuration.

IGMP allows receiver hosts to join or leave multicast groups, and allows RouterB and RouterH to maintain and manage multicast memberships.

MBGP (mandatory)

MBGP must be configured on RouterA and RouterF located at the AS borders.

For the configuration procedure, see Configuring MP-BGP.

MBGP sends multicast data from multicast sources Source1 and Source2 to receivers in another AS based on an independent multicast routing table.

MSDP (mandatory)

MSDP must be configured on the RP in each PIM-SM, that is, RouterA, RouterD, and RouterF.

For the configuration procedure, see MSDP Configuration.

MSDP transmits multicast data among PIM-SM1, PIM-SM2, and PIM-SM3.

Multicast Deployment on an IPv6 Network

This section describes typical multicast service scenarios on an IPv6 network and applications of multicast protocols.

NOTE:

Before deploying IPv6 multicast services on a network, ensure that IPv6 unicast routes on the network are reachable.

Figure 8-10 Basic IPv6 multicast service deployment

Table 8-13 Multicast protocols used for multicast on an IPv6 Network

Protocol

Application Position

Purpose

PIM (IPv6) (mandatory)

PIM (IPv6) must be configured on all interfaces of Layer 3 multicast devices, including all interfaces of RouterA, RouterB, RouterC and RouterD.

For the configuration procedure, see PIM (IPv6) Configuration.

PIM-IPv6 sends multicast data from multicast source to RouterC and RouterD connected to multicast receivers.

MLD (mandatory)

MLD must be configured on user-side interfaces of Layer 3 multicast devices RouterC and RouterD.

For the configuration procedure, see MLD Configuration.

MLD allows receiver hosts to join or leave multicast groups, and allows RouterC and RouterD to maintain and manage multicast memberships.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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