Multicast Forwarding
Configuring Multicast Properties
Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x 167
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- For IPv4, this is mapped by taking the 23 low-order bits from the IPv4
address, and adding them to the 01:00:5e prefix. By standard, the upper
nine bits of the IP address are ignored, and any IP addresses that only
differ in the value of these upper bits are mapped to the same Layer 2
address, since the lower 23 bits that are used are identical. For example,
234.129.2.3 is mapped to a MAC Multicast group address
01:00:5e:01:02:03. Up to 32 IP Multicast group addresses can be
mapped to the same Layer 2 address.
- For IPv6, this is mapped by taking the 32 low-order bits of the Multicast
address, and adding the prefix of 33:33. For example, the IPv6 Multicast
address FF00:1122:3344 is mapped to Layer 2 Multicast
33:33:11:22:33:44.
Configuring Multicast Properties
Use the Properties page to globally enable IGMP Snooping and/or IPv6 MLD
Snooping on the switch and set the default action for unknown Multicast traffic. By
default, all Multicast frames are flooded to all ports of the VLAN.
To configure Multicast properties:
STEP 1 Click Multicast > Properties.
STEP 2 Enter the following information:
• IGMP Snooping—Enable or disable IGMP Snooping globally on the switch
(enabled by default). When enabling IGMP Snooping, the devices that
monitor network flow will determine which hosts have requested to receive
multicast traffic, and the switch only executes IGMP Snooping.
• MLD Snooping—Enable or disable MLD Snooping globally on the switch
(disabled by default).
• Unknown Multicast Action—Choose how to deal with unknown Multicast
frames. The possible options are:
-
Drop
—Drops unknown Multicast frames.
-
Flood
—Floods unknown Multicast frames.
-
Forward to Router Port
—Forwards unknown Multicast frames to Mrouter
port.
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