WG82574IT S LBAC Intel, WG82574IT S LBAC Datasheet - Page 202

• Manufacturer Part Number: WG82574IT S LBAC
• Description: CONTROLLER, ENET, INTEL 82574IT, 64PQFN
• Manufacturer: Intel

Specifications of WG82574IT S LBAC

• Ethernet Type: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 64
• Package / Case: QFN
• Interface Type: I2C, JTAG, PCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Note:
Note:
8.4.3.1
Note:
202
The high-level structure of manageability filtering is done using two steps:
Some general rules apply:
The MFVAL register can enable manageability MAC, VLAN and IP filtering. These filters
also have enable bits in other registers (MAC address with RAH[15].AV, VLAN filtering
with MAVTV[3:0].En, IPv4 filtering with IPAV.IP40 and IPv6 filtering with IPAV.IP60).
Any of these filters are enabled if one of the enable bits is set to 1b.
If the manageability unit uses a dedicated MAC address/VLAN tag, it should take care
not to use L3/L4 decision filtering on top of it. Otherwise all the packets with the
manageability MAC address/VLAN tag filtered out at L3/L4 are forwarded to the host.
The following sections describe each of these stages in detail.
L2 Layer Filtering
Figure 45
filtering if any of the following conditions are met:
In case of a broadcast packet, the packet does not go through VLAN filtering (such as,
VLAN filtering is assumed to match).
Promiscuous unicast mode - Promiscuous unicast mode can be set/cleared only by the
software device driver (not by the MC), and it is usually used when the LAN device is
used as a sniffer.
Promiscuous multicast mode - Promiscuous multicast is used in LAN devices that are
used as a sniffer, and is controlled only by the software device driver. This bit can also
be used by a MC requiring forwarding of all multicasts.
Unicast filtering - the entire MAC address is checked against the 16 unicast addresses.
The 15 host unicast addresses are controlled by the software device driver (the MC
must not change them). The last unicast address (address 16) is dedicated to
management functions and is only accessed by the MC.
The MC configures manageability unicast filtering via the RAH[15] and RAL[15]
registers and enables them in the MFVAL register.
1. Packets are filtered by L2 criteria (MAC address and unicast/multicast/broadcast).
2. Packets are filtered by the manageability filters (port, IP, flex, etc.).
1. It is a unicast packet and promiscuous unicast filtering is enabled.
2. It is a unicast packet and it matches one of the unicast MAC filters (host or
3. It is a multicast packet and promiscuous multicast filtering is enabled.
4. It is a multicast packet and it matches one of the multicast filters.
5. It is a broadcast packet.
• Fragmented packets are passed to manageability but not parsed beyond the IP
• Packets with L2 errors (CRC, alignment, etc.) are never forwarded to
header.
manageability, unless the RCTL.SBP bit is set and there is a packet size error
(greater than 1522 or shorter than 64 bytes).
manageability).
shows the manageability L2 filtering. A packet passes successfully through L2
82574 GbE Controller—System Manageability