Dell Networking S6000 Uživatelský manuál Strana 232

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The system supports loading two DCB_Config files:
FCoE converged traffic with priority 3.
iSCSI storage traffic with priority 4.
In the Dell Networking OS, PFC is implemented as follows:
PFC is supported on specified 802.1p priority traffic (dot1p 0 to 7) and is configured per interface.
However, only two lossless queues are supported on an interface: one for FCoE converged traffic
with priority 3 and one for iSCSI storage traffic with priority 4. You must configure the same lossless
queues on all ports.
PFC delay constraints place an upper limit on the transmit time of a queue after receiving a message
to pause a specified priority.
By default, PFC is enabled on an interface with no dot1p priorities configured. You can configure the
PFC priorities if the switch negotiates with a remote peer using DCBx
During DCBx negotiation with a remote peer:
DCBx communicates with the remote peer by LLDP TLV to determine current policies, such as PFC
support and ETS bandwidth allocation.
If the negotiation fails and PFC is enabled on the port, any user-configured PFC input policies are
applied. If no PFC input policy has been previously applied, the PFC default setting is used (no
priorities are configured). If you do not enable PFC on an interface, you can enable the 802.3x link-
level pause function. By default, the link-level flow pause is disabled when DCBx and PFC are enabled.
If no PFC input policy has been applied on the interface, the default PFC settings are used.
If DCBx negotiation is not successful (for example, a version or TLV mismatch), DCBx is disabled and
PFC or ETS cannot be enabled.
PFC supports buffering to receive data that continues to arrive on an interface while the remote
system reacts to the PFC operation.
PFC uses DCB MIB IEEE 802.1azd2.5 and PFC MIB IEEE 802.1bb-d2.2
PFC supports buffering to receive data that continues to arrive on an interface while the remote
system reacts to the PFC operation.
PFC uses DCB MIB IEEE 802.1azd2.5 and PFC MIB IEEE 802.1bb-d2.2.
PFC is supported on specified 802.1p priority traffic (dot1p 0 to 7) and is configured per interface.
However, only two lossless queues are supported on an interface: one for Fibre Channel over
Ethernet (FCoE) converged traffic and one for Internet Small Computer System Interface (iSCSI)
storage traffic. Configure the same lossless queues on all ports.
PFC supports buffering to receive data that continues to arrive on an interface while the remote
system reacts to the PFC operation.
232
Data Center Bridging (DCB)
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