Aviat Networks ECLIPSE EDGE, Руководство пользователя

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260-668080-001 Rev 002 March 2013 13
Eclipse Edge User Manual
A priority mode selection determines queue-controller operation for the following
options. A selection applies to both user ports.
• Port Default enables port prioritization. This only has relevance where both ports are
used to connect traffic to a shared link channel. It ignores any 802.1p VLAN CoS
priority tags or IP DiffServ priority values.
• 802.1p provides traffic prioritization based on the three-bit CoS field within a VLAN
tag. Each of the possible eight tag priority values are mapped into a four-level (2-bit)
IDU ES priority level.
• DiffServ provides traffic prioritization based on the six bits of the IP packet DiffServ
or Type of Service byte. Each of the possible 64 levels are mapped into a four-level
(2-bit) priority level.
• 802.1p-then-DiffServ provides traffic prioritization based first on the 802.1p VLAN
tag, and then on the DiffServ or Type of Service byte.
• DiffServ-then-802.1p provides traffic prioritization based first on the IP packet
DiffServ or Type of Service byte, then on the 802.1p VLAN tag.
Flow Control
Flow Control is an option for full-duplex links only. It is implemented through use of
IEEE 802.3x Pause frames, which tell the remote terminal to stop or restart
transmission to ensure that the amount of data in the receive buffer does not exceed
a ‘high water mark’. To be effective, flow control must be established from the
originating source through to the end point, and vice versa, which means the
equipment connected to the Edge Ethernet ports and beyond should also be enabled
for flow control.
Disable Address Learning
MAC Address Learning is default implemented to support efficient management of
Ethernet traffic in multi-host situations. The option to disable Address Learning is
primarily for use in an Ethernet ring network where protection is provided by an
external RSTP switch. To avoid conflict between the self-learning function within the
IDUspe and the external RSTP switch during path failure situations, the IDUspe
capability
must be switched off.
Maximum Frame Size
Maximum frame size is fixed at 2048 bytes; Edge Ethernet ports accept frame sizes
from 64 to 2048 bytes.
Ethernet Diagnostics
Portal diagnostics screens capture Ethernet performance and history. The data for
IDUspe includes:
• Port/channel status.
• Configured capacities.
• Graphed current Rx and Tx throughputs and discards per port and channel.