zl50411 Zarlink Semiconductor, zl50411 Datasheet - Page 43

• Manufacturer Part Number: zl50411
• Description: Managed 9-port Fast Ethernet Switch With Private Vlan
• Manufacturer: Zarlink Semiconductor

The value of the TPID of the Provider VLAN tag is not assigned in the IEEE 802.1ad standard. The ZL50411
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.
5.9.4
The PVLAN Edge (protected port) is a feature that has only local significance to the switch (unlike Private VLANs),
and there is no isolation provided between two protected ports located on different L2 switches. A protected port
does not forward any traffic (unicast, multicast, or broadcast) to any other port that is also a protected port in the
same switch. Traffic cannot be forwarded between protected ports at L2, thus, all traffic passing between protected
ports must be forwarded through a Layer 3 (L3) device.
The ZL50410 supports private VLAN Edge by allowing each of the RMAC ports to setup a private VLAN domain,
defined by registers PVLAN_Pn. The private VLAN domain is used for final qualification at the egress port.
See Private VLAN Edge application note, ZLAN-130, for more information.
5.10
The ZL50411 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 ZL50411 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
Private VLAN Edge
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 11 - 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)
ZL50411
43
Tag Protocol ID
(0x8100)
Type/Length
VLAN
(2 Byte)
802.1Q Tag
IEEE
VLAN TCI
(2 Bytes)
Data
Type/Length
(2 Byte)
Data
Data Sheet