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参数资料
| 型号： | ZL50418/GKC |
| 厂商： | ZARLINK SEMICONDUCTOR INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
| 封装： | 37.50 X 37.50 MM, 2.33 MM HEIGHT, MS-034, HSBGA-553 |
| 文件页数： | 105/155页 |
| 文件大小： | 1928K |
| 代理商： | ZL50418/GKC |
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ZL50418
Data Sheet
53
Zarlink Semiconductor Inc.
In tag-based VLAN mode, if the frame is unicast, and the destination port is not a member of the correct VLAN, then
the frame is dropped; otherwise, the frame is forwarded. If the frame is multicast, this same table is used to indicate
all the ports to which the frame will be forwarded. Moreover, if port trunking is enabled, this block selects the
destination port (among those in the trunk group).
In port-based VLAN mode, a bitmap is used to determine whether the frame should be forwarded to the outgoing
port. The main difference in this mode is that the bitmap is not dynamic. Ports cannot enter and exit groups
because of real-time learning made by a CPU.
The MAC search block is also responsible for updating the source MAC address timestamp and the VLAN port
association timestamp, used for aging.
6.3.2
Learning
The learning module learns new MAC addresses and performs port change operations on the MCT database. The
goal of learning is to update this database as the networking environment changes over time.
When CPU reporting is enabled, learning and port change will be performed when the CPU request queue has
room, and a memory slot is available, and a “Learn MAC Address” message is sent to the CPU. When fast learning
mode is enabled, learning and port change will be performed when memory slot is available and a latter “Learn
MAC Address” message is sent to the CPU when CPU queue has room.
When CPU reporting is disabled, learning and port change will be performed based on memory slot availability only.
In tag based VLAN mode, if the source port is not a member of a classified VLAN a “New VLAN Port” message is
sent to the CPU. The CPU can decide whether or not the source port can be added to the VLAN.
6.3.3
Aging
Aging time is controlled by register 400h and 401h.
The aging module scans and ages MCT entries based on a programmable “age out” time interval. As we indicated
earlier, the search module updates the source MAC address and VLAN port association timestamps for each frame
it processes. When an entry is ready to be aged, the entry is removed from the table and a “Delete MAC Address”
message is sent to inform the CPU.
Supported MAC entry types are: dynamic, static, source filter, destination filter, IP multicast, source and destination
filter and secure MAC address. Only dynamic entries can be aged; all others are static. The MAC entry type is
stored in the “status” field of the MCT data structure.
6.4
MAC Address Filtering
The ZL50418's implementation of intelligent traffic switching provides filters for source and destination MAC
addresses. This feature filters unnecessary traffic, thereby providing intelligent control over traffic flows and
broadcast traffic.
MAC address filtering allows the ZL50418 to block an incoming packet to an interface when it sees a specified MAC
address in either the source address or destination address of the incoming packet. For example, if your network is
congested because of high utilization from a MAC address you can filter all traffic transmitted from that address and
restore network flow while you troubleshoot the problem.
6.5
Port- and Tagged-Based VLAN
The ZL50418 supports two models for determining and controlling how a packet gets assigned to a VLAN: port-
based and tagged-based.
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