7705 SAR Interfaces
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Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
3.2.7 Flow Control on Ethernet Ports
IEEE 802.3x Flow Control, which is the process of pausing the transmission based
on received pause frames, is supported on Fast Ethernet, Gigabit Ethernet, and
10-Gigabit Ethernet (SFP+) ports. In the transmit direction, the Ethernet ports
generate pause frames if the buffer occupancy reaches critical values or if port FIFO
buffers are overloaded. Pause frame generation is automatically handled by the
Ethernet Adapter card when the system-wide constant thresholds are exceeded. The
generation of pause frames ensures that newly arriving frames still can be processed
and queued, mainly to maintain the SLA agreements.
If autonegotiation is on for an Ethernet port, enabling and disabling of IEEE 802.3x
Flow Control is autonegotiated for receive and transmit directions separately. If
autonegotiation is turned off, the reception and transmission of IEEE 802.3x Flow
Control is enabled by default and cannot be disabled.
Ingress flow control for the 6-port SAR-M Ethernet module is Ethernet link-based and
not port-based. When IEEE 802.3x Flow Control is enabled on the 6-port SAR-M
Ethernet module, pause frames are multicast to all ports on the Ethernet link. There
are two Ethernet links on the 6-port SAR-M Ethernet module: one for ports 1, 3, and
5, and one for ports 2, 4, and 6. Pause frames are sent to either ports 1, 3, and 5, or
to ports 2, 4, and 6, depending on which link the pause frame originates.
3.2.8 Ethernet OAM
This section contains information on the following topics:
• Ethernet OAM Overview
• CRC (Cyclic Redundancy Check) Monitoring
• Remote Loopback
• 802.3ah OAMPDU Tunneling and Termination for Epipe Service
• Dying Gasp
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