ZT8101 Intel (CPU), ZT8101 Datasheet - Page 36

• Manufacturer Part Number: ZT8101
• Manufacturer: Intel (CPU)

Specifications of ZT8101

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Layer 3 Multicast Routing Protocols
7.4
36
Table 19. Packet Sequence
Note: The switch supports a maximum of 255 VLANs and a maximum of 128 IGMP Snooping groups. If
IGMP Snooping
IGMP Snooping is a feature that reduces the flooding of IP multicast traffic.The default behavior
for handling a multicast packet is to flood the packet to all members of a VLAN. With IGMP
Snooping, only the active member ports receive the data.
All groups learned by IGMP snooping are recorded in an internal group table with the VLAN ID
and multicast group address used as the table’s index. This table stores the active member ports for
this group. This table can contain a maximum of 128 groups. If the active multicast groups exceed
this limit, the new group’s data will be flooded in the VLAN.
You can globally enable or disable IGMP Snooping on the switch. You can also enable or disable
the snooping for a specific VLAN. You must enable IGMP globally for it to be enabled on a
specific VLAN. By default, the IGMP global flag is off and per-VLAN flag is on. Thus, when you
enable IGMP globally, it is enabled on all VLANs.
You can configure the switch to snoop and to keep track of IGMP groups. These two interact in the
following ways:
you create more than 128 VLANs with IGMP Snooping enabled, some of those VLANs will not be
added to the IGMP Snooping table and the group’s data will be flooded in the VLAN.
0
255
286
411
536
661
•
•
Time (seconds)
If the IP interface has IGMP Snooping configured for the associated VLAN, the configuration
of IGMP Snooping will be overwritten by the IGMP group settings. On such VLANs, the per-
VLAN flag is the only available configurable option on the IGMP Snooping screen.
If the IGMP group settings are disabled on the interface, IGMP Snooping on the VLAN
becomes configurable and the switch uses these settings for the VLAN.
Intel
®
NetStructure
Switch decides to be IGMP Querier for the VLAN
1st Query Packet
2nd Query Packet (255+31)
3rd Query Packet (286+125)
4th Query Packet (411+125)
5th Query Packet (536+125)
TM
ZT 8101 10/100 Ethernet Switch Technical Product Specification
Description