Table of Contents
Advertisement
Multicast Forwarding
Configuring Multicast Properties
Configuring Multicast Properties
STEP 1
STEP 2
Cisco 220 Series Smart Plus Switches Administration Guide Release 1.0.0.x
Multicast Address Properties
Multicast Address Properties
Multicast addresses have the following properties:
•
Each IPv4 Multicast address is in the address range 224.0.0.0 to
239.255.255.255.
•
The IPv6 Multicast address is FF00:/8.
•
To map an IP Multicast group address to an Layer 2 Multicast address:
-
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. 1 29.2.3 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.
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:
Click Multicast > Properties.
Enter the following information:
•
IGMP Snooping—Check Enable to globally enable IGMP Snooping on the
switch, or uncheck to disable it. By default, IGMP Snooping is enabled on the
switch. 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.
14
160
Advertisement
Table of Contents
