UMN:CLI
User Manual
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11.2
IPv6 Multicast Functions
This system provides various multicast functions including Layer 2 multicast forwarding,
which allow you to achieve the fully effective and flexible multicast deployment.
11.2.1
Multicast Forwarding Database
Internally, this system forwards the multicast traffic referred to the multicast forwarding da-
tabase (McFDB). The McFDB maintains multicast forwarding entries collected from mul-
ticast protocols and features, such as PIM, MLD etc.
11.2.1.1
Blocking Unknown Multicast Traffic
When certain multicast traffic comes to a port and the McFDB has no forwarding infor-
mation for the traffic, the IPv6 multicast traffic is flooded to all ports by default. You can
configure the switch not to flood unknown IPv6 multicast traffic.
To configure the switch to discard unknown IPv6 multicast traffic, use the following com-
mand.
Command
Mode
Description
ipv6 unknown-multicast
block
Global
Configures the switch to discard unknown IPv6 mul-
ticast traffic.
PORTS: unknown IPv6 multicast port number
ipv6 unknown-multicast
port
PORTS
ipv6 unknown-multicast
port
PORTS block
no
ipv6
unknown-multicast
block
Configures the switch to flood unknown IPv6 multicast
traffic. (default)
PORTS: unknown IPv6 multicast port number
no ipv6 unknown-multicast
port
PORTS
no ipv6 unknown-multicast
port
PORTS block
This command should not be used for the ports to which a multicast router is attached!
11.2.1.2
Forwarding Entry Aging
To specify the aging time for forwarding entries on the McFDB, use the following com-
mand.
Command
Mode
Description
ipv6 mcfdb aging-time
<10-10000000>
Global
Specifies the aging time for forwarding entries on the
McFDB.
10-10000000: IPv6 aging time (default: 300)
no ipv6 mcfdb aging-time
Deletes the specified aging time for forwarding entries.
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