Cavium 41 Series, Руководство пользователя

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292 AH0054602-00 J
User’s Guide—Converged Network Adapters
41
xxx Series
Layer 2
Refers to the data link layer of the multilay-
ered communication model, Open
Systems Interconnection (OSI). The
function of the data link layer is to move
data across the physical links in a network,
where a switch redirects data messages at
the Layer 2 level using the destination
MAC address to determine the message
destination.
Link Layer Discovery Protocol
See LLDP .
LLDP
A vendor-neutral Layer 2 protocol that
allows a network device to advertise its
identity and capabilities on the local
network. This protocol supersedes propri-
etary protocols like Cisco Discovery
Protocol, Extreme Discovery Protocol, and
Nortel Discovery Protocol (also known as
SONMP).
Information gathered with LLDP is stored
in the device and can be queried using
SNMP. The topology of a LLDP-enabled
network can be discovered by crawling the
hosts and querying this database.
LSO
Large send offload. LSO Ethernet adapter
feature that allows the TCP\IP network
stack to build a large (up to 64KB) TCP
message before sending it to the adapter.
The adapter hardware segments the
message into smaller data packets
(frames) that can be sent over the wire: up
to 1,500 bytes for standard Ethernet
frames and up to 9,000 bytes for jumbo
Ethernet frames. The segmentation
process frees up the server CPU from
having to segment large TCP messages
into smaller packets that will fit inside the
supported frame size.
maximum transmission unit
See MTU .
message signaled interrupts
See MSI, MSI-X .
MSI, MSI-X
Message signaled interrupts. One of two
PCI-defined extensions to support
message signaled interrupts (MSIs), in
PCI 2.2 and later and PCI Express. MSIs
are an alternative way of generating an
interrupt through special messages that
allow emulation of a pin assertion or
deassertion.
MSI-X (defined in PCI 3.0) allows a device
to allocate any number of interrupts
between 1 and 2,048 and gives each inter-
rupt separate data and address registers.
Optional features in MSI (64-bit
addressing and interrupt masking) are
mandatory with MSI-X.
MTU
Maximum transmission unit. Refers to the
size (in bytes) of the largest packet (IP
datagram) that a specified layer of a
communications protocol can transfer.
network interface card
See NIC .
NIC
Network interface card. Computer card
installed to enable a dedicated network
connection.
NIC partitioning
See NPAR .
non-volatile random access memory
See NVRAM .
non-volatile memory express
See NVMe .