zl50409 Zarlink Semiconductor, zl50409 Datasheet - Page 50
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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9.0
See Traffic Mirroring application note, ZLAN-50, for more information.
9.1
Packets can be mirrored (duplicated) for network monitor purpose and/or network debug purpose. Three types of
mirroring is available in ZL50409.
1. Source or Destination MAC address based
2. Flow based
3. Port based
In source or destination mac address based mirroring, the “M” bit of the mirroring MAC address in the MCT is set.
Also, the user need to specify the mirroring MAC address is source or destination of the packet. If source is
selected, any packet received with the mirroring MAC address as source MAC address will be copied to the
mirrored port. In the same way, if destination is selected, any packet received with mirroring MAC address as
destination MAC address will be copied to the mirrored port.
In flow based mirroring, a flow is established based on the source and destination mac address pair. When
enabled, a packet with source and destination address match the pre-programmed source and destination mac
address pair will be copied to the mirrored port. In reverse direction (source and destination match pre programmed
destination and source), the flow can also be enabled and the frame will be copied to the mirrored port.
In port based mirroring, traffic from any RMAC port can be mirrored to any RMAC port. The traffic from the source
port can be either ingress or egress traffic. Up to two ports can be setup as mirrored ports. As a result, the traffic
(both ingress and egress) of a specific port can be monitored by setting up both mirrored ports. Once a port is setup
as mirrored port, it cannot be used for regular traffic.
The mirrored port can be any port in the ZL50409.
9.2
To perform remote loop back test, port mirroring can be used to bounce back the packet to the source port to check
the data path.
The CPU needs to setup the remote device through the command channel to enable port mirroring in the remote
device. A CPU packet is send to the port in test in Device A. The packet will be forwarded to the test port, external
cable, the destination port in Device B, and loop back to itself, back to the cable and go back to Device A and the
CPU. This way, the whole channel can be tested.
Mirroring Features
Using port mirroring for loop back
Traffic Mirroring
DEVICE A
CPU
Figure 12 - Remote Loopback Test
Zarlink Semiconductor Inc.
ZL50409
50
DEVICE B
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