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Cisco 500 Series Administration Guide

Cisco 500 Series
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Multicast
Multicast Forwarding
Cisco 500 Series Managed Switch Administration Guide 318
17
If the IGMP/MLD querier election mechanism is disabled, then the IGMP/MLD
Snooping Querier delays sending general query messages after its enabling for
60 seconds. If there is no other querier, it starts to send general query messages. It
stops sending general query messages if it detects another querier.
The IGMP/MLD Snooping querier resumes sending general query messages if it
does hear another querier for the following interval:
Query passive interval = Robustness * Query Interval + 0.5*Query Response
Interval.
NOTE It is recommended to disable IGMP/MLD Querier election mechanism if there is an
IPM Multicast router on the VLAN.
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,
234.129.2.3 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.
IGMP/MLD Proxy
IGMP/MLD Proxy is a simple IP Multicast protocol.

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Cisco 500 Series Specifications

General IconGeneral
ModelCisco 500 Series
CategorySwitch
MountingRack-mountable
ManagementWeb-based, CLI, SNMP
Ports24, 48
Port Speed10/100/1000 Mbps
PoE SupportAvailable on some models
Switching CapacityUp to 176 Gbps
MAC Address Table Size16, 000 entries
SecurityACLs, 802.1X
Quality of Service (QoS)Yes
DimensionsVaries by model
WeightVaries by model
Humidity10% to 90% non-condensing
Power SupplyInternal
Power ConsumptionVaries by model
Jumbo Frame SupportUp to 9216 bytes

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