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| 型号： | ZL50408GDG2 |
| 厂商： | CONEXANT SYSTEMS |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, LAN SWITCHING CIRCUIT, PBGA208 |
| 封装： | 17 X 17 MM, 1.40 MM HEIGHT, LEAD FREE, MO-192, LBGA-208 |
| 文件页数： | 84/144页 |
| 文件大小： | 1779K |
| 代理商： | ZL50408GDG2 |
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ZL50408
Data Sheet
44
Zarlink Semiconductor Inc.
Figure 11 - Q-in-Q Tagged Ethernet Frame
The value of the TPID of the Provider VLAN tag is not assigned in the IEEE 802.1ad standard. The ZL50408
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
IP Multicast Switching
The ZL50408 supports IP Multicast Filtering by:
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.
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 ZL50408 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.
5.11
L2 Multicast Switching
The ZL50408 supports multicast MAC address learning when in tagged-based VLAN mode. The purpose of
multicast MAC learning is to optimize a L2 switched network performance, so multicast packets will only be
forwarded to those ports configured to receive that multicast traffic instead of flooding to all ports within the VLAN.
6.0
Frame Engine
6.1
Data Forwarding Summary
When a frame enters the device at the RxMAC, the RxDMA will move the data from the MAC RxFIFO to the FDB.
Data is moved in 8-byte granules in conjunction with the scheme for the SRAM interface.
IEEE 802.1Q Tagged
Ethernet Frame
Dest MAC
(6 Bytes)
Source MAC
(6 Bytes)
Type/Length
(2 Byte)
Data
VLAN
Tag Protocol ID
(0x8100)
VLAN TCI
(2 Bytes)
Provider
Tag
(P-VLAN)
IEEE
802.1Q Tag
Type/Length
(2 Byte)
Data
VLAN
Tag Protocol ID
(0x8100)
VLAN TCI
(2 Bytes)
Dest MAC
(6 Bytes)
Source MAC
(6 Bytes)
VLAN
Tag Protocol ID
(0x88A8*)
VLAN TCI
(2 Bytes)
IEEE
802.1Q Tag
IEEE 802.1Q-in-Q Tagged
Ethernet Frame
IEEE 802.1Q Tag TPID = 0x8100
* Provider Tag TPID = Configurable on per device basis
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL50409 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Managed 9-Port 10/100M Ethernet Switch |
| ZL50409GDC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Managed 9-Port 10/100M Ethernet Switch |
| ZL50409GDC1 | 制造商:Microsemi Corporation 功能描述: |
| ZL50410 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Managed 8-Port 10/100M + 1-Port 10/100/1000M Ethernet Switch |
| ZL50410GDC208 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:Managed 8-Port 10/100M + 1-Port 10/100/1000M Ethernet Switch |
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