3.13.1 IPv4 multicast

The table below describes the number of interfaces for which IPv4 multicasting can be specified and the number of entries in the routing tables. The Switch supports PIM-SM or PIM-SSM as IPv4 multicast routing protocols. PIM-SM and PIM-SSM can operate simultaneously.

If IPv4 multicasting is used on multiple VRFs, include the total of all VRFs and the global network within the capacity limitations.

Table 3-77 IPv4 Multicast Maximums
Item	Maximum number
PIM-SM/SSM multicast interfaces #1 #2	511/device
IGMP operating interfaces #2	511/device
Number of multicast sources	128/group
PIM-SM/SSM multicast routing information entries ((S,G) entries, (*, G) entries, and negative caches) #3 S: Source IP address G: Group address	8191/device
Number of paired source/group settings for PIM-SSM operation in IGMPv2/IGMPv3(EXCLUDE mode #4	1024/switch
Record data that can be processed for 1Report by OOC #5	256record/ messaging 256 Sources /record
Number of IGMP subscribers #6	1024/switch
Multicast neighboring routers	64/device
Rendezvous points	2/Group
Groups that can be assigned to rendezvous points per switch	128/device
Total number of groups that can be assigned to rendezvous points per network (VPN)	1024/NETWORK (VPN) 1024/Equipment #7
Number of possible rendezvous points per network (VPN)	1024/NETWORK (VPN) 1024/Equipment #7
Number of BSR candidates per network (VPN)	16/Network (VPN) 32/device #7
Number of static subscription groups #8	256/device
Static rendezvous point (RP) router addresses	16/device
Number of IGMP subscriptions per interface #6	1024/Interface
Source addresses per IGMP group	128/group
VRFs to which multicast can be set	32/device #9
Number of multicast filters in the extranet #10	64/device
route-map to be used for an extranet	32/device 32/VRF
PIM-SM VRF Gateway operation multicast addresses #11	32/device 32/VRF

Note #1

The number of interfaces adjacent to other routers in PIM-SM or PIM-SSM mode.

Note #2

If PIM-SM/SSM is used for an interface, IGMP runs automatically on the corresponding interface, so each interface is used one by one.

Note #3

The maximum number depends on the table entries allocation pattern. For details, see "3.1 Number of table entries". When PIM-SM is used in an environment that satisfies the following conditions, the maximum number of entries is 128 even if a mode in which the maximum number of entries is 128 or more selected.

High-volume multicast communications such as streaming
The Switch acts as a first-hop router or rendezvous point.

Since there is also an upper limit on the number of input/output ports of an entry, the number of entries that can be set also varies depending on the number of input/output ports.

When a port is shared by the Input and Output interfaces, the number of I/O ports in an entry is counted as 1. For example, if the input interface uses ports 1/0/1 and 1/0/2, and the output interface 1 uses ports 1/0/2, 1/0/3, and 1/0/4, and the output interface 2 uses ports 1/0/3, 1/0/4, and 1/0/5, the number of input and output ports for the corresponding entry is 5.

You can specify up to the number of I/O ports listed in Table 3-Number of multicast I/O ports for 78 IGMP/MLD number of active interfaces. If there are many duplicate I/O interfaces between entries, you may be able to set more entries than listed in Table 3-Number of Multicast I/O Ports for 78 IGMP/MLD Operating Interface.

The number of I/O ports is the sum of IPv4 and IPv6 entries when IPv4 and IPv6 operate at the same time.

Note #4

The number of source and group pairs depends on the number of interfaces and subscription groups used in the multicast. Use the number of PIM-SSM that can be linked in Table 3-79 (IGMPv2/IGMPv3(EXCLUDE mode for the number of interfaces used) and Table 3-80 (IGMPv2/IGMPv3(EXCLUDE mode for the number of subscription groups) within the limits shown in "Number of PIM-SSM that can be linked". The number of subscription groups is sum of the dynamic and static subscription groups. If a group address subscribes to multiple interfaces, the number of subscription groups is not one but the number of the interfaces to which the group address subscribes.

Note #5

A maximum of 256 sources can be processed in a Report message. A record that does not contain source information is also counted as one source.

When PIM-SSM is configured to interoperate with IGMPv3 (EXCLUDE mode), the number of sources defined in the EXCLUDE record that matches that setting are counted. If there are multiple EXCLUDE records in the received Report message, and if more than 256 sources were added when configuring PIM-SSM interoperability with IGMPv3 (EXCLUDE mode), no multicast relay information will be created for any subsequent EXCLUDE records in that Report message that match the PIM-SSM setting.

Note #6

The number of groups that connect directly to the Switch. When the source is specified in IGMPv3 mode, the number of groups is the number of source-and-group combinations. Figure 3-1: Example of number of multicast groups shows 3. For details about the number of groups that can subscribe to each interface, see Table 3-Number of groups that can subscribe to each interface in 81 IPv4.

Figure 3-1: Example of number of multicast groups

Note #7

The total number of networks (VPN) that are connected to the global network and all VRFs of this Switch.

Note #8

The number of static subscription groups is the total number of group addresses that statically subscribe to each multicast interface. If a group address statically subscribes to several different interfaces, the number of the static subscription groups is not one but the number of interfaces to which the group address statically subscribes. A maximum of 256 static subscription groups can be set for a single interface.

Note #9

If multicast is set globally, it is set to 31.

Note #10

The total number of addresses in the access lists (access-list) specified for all route-map instances.

Note #11

Uses route-map specified for the extranet. The multicast address specified as the host address (32-bit mask) in access-list specified in route-map is the target.

The maximum number for each switch is the total number of all group addresses of the PIM-SM VRF gateways specified on VRFs.

This number is added to the number of group addresses specified as static subscription groups.

Table 3-78: Number of multicast I/O ports for IGMP/MLD number of operation interfaces
IGMP/MLD Operating Interfaces	Number of I/O ports per entry summed for all entries
No more than 64	24575
65~128	12287
129~192	8191
193~256	6143
257~320	4915
321~384	4095
385~448	3510
449~512	3071
513~576	2730
577~638	2457

Table 3-79: Number of configurable PIM-SSM that can be linked in IGMPv2/IGMPv3(EXCLUDE mode/number of interfaces used
Number of used interfaces	Number of settings to enable PIM-SSM interoperability with IGMPv2/IGMPv3 (EXCLUDE mode)
15	1024
31	512
63	256
127	128
255	64
511	32

Table 3-80: Number of configurable PIM-SSM that can be linked in IGMPv2/IGMPv3(EXCLUDE for the number of subscription groups
Total number of subscription groups	Number of settings to enable PIM-SSM interoperability with IGMPv2/IGMPv3 (EXCLUDE mode)
32	1024
64	512
128	256
256	128
512	64
1024	32
2048	16
4096	8
8128	4

Table 3-81: Possible Subscriber Groups per Interface for IPv4
Number of used interfaces	Possible number of subscription groups per interface
7	1024
15	512
31	256
63	128
127	64
255	32
511	16