zl50409 Zarlink Semiconductor, zl50409 Datasheet - Page 40
zl50409
Manufacturer Part Number
zl50409
Description
Managed 9-port 10/100m Ethernet Switch
Manufacturer
Zarlink Semiconductor
Datasheet
1.ZL50409.pdf
(135 pages)
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The value of the TPID of the Provider VLAN tag is not assigned in the IEEE 802.1ad standard. The ZL50409
provides a global configurable TPID but only supports the Extreme EtherType TPID (i.e. the stacked VLAN tag
cannot equal 0x81-00).
See Stacked VLAN application note, ZLAN-82, for more information.
5.10
The ZL50409 supports IP Multicast Filtering by:
•
•
The purpose of IP multicast filtering is to optimize a switched network performance, so multicast packets will only
be forwarded to those ports containing multicast group hosts members and routers instead of flooding to all ports in
the subnet (VLAN).
The ZL50409 with IP multicast filtering/switching capability not only passively monitor IGMP Query and Report
messages, DVMRP Probe messages, PIM, and MOSPF Hello messages; they also actively send IGMP Query
messages to learn locations of multicast routers and member hosts in multicast groups within each VLAN.
See IP Multicast Switching application note, ZLAN-52, for more information.
Passively snooping on the IGMP Query and IGMP Report packets transferred between IP Multicast Routers
and IP Multicast host groups to learn IP Multicast group members, and
Actively sending IGMP Query messages to solicit IP Multicast group members.
IEEE 802.1Q Tagged
Ethernet Frame
IEEE 802.1Q-in-Q Tagged
Ethernet Frame
Dest MAC
(6 Bytes)
IP Multicast Switching
Dest MAC
(6 Bytes)
* Provider Tag TPID = Configurable on per device basis
Source MAC
(6 Bytes)
Source MAC
(6 Bytes)
IEEE 802.1Q Tag TPID = 0x8100
Tag Protocol ID
(0x88A8*)
Tag Protocol ID
VLAN
(0x8100)
VLAN
Figure 10 - Q-in-Q Tagged Ethernet Frame
Provider
(P-VLAN)
802.1Q Tag
Tag
IEEE
VLAN TCI
(2 Bytes)
VLAN TCI
Zarlink Semiconductor Inc.
(2 Bytes)
ZL50409
Tag Protocol ID
40
(0x8100)
Type/Length
VLAN
(2 Byte)
802.1Q Tag
IEEE
VLAN TCI
(2 Bytes)
Data
Type/Length
(2 Byte)
Data
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