Ericsson ECN320, Руководство пользователя

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ECN Functions, Features and HW
1553-CNH 160 0787 Uen PA2 2005-09-23
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3.1.2 Performance
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Transparent bridging – The ECN supports IEEE 802.1D transparent
bridging. The address table facilitates data switching by learning ad-
dresses, and then filtering or forwarding traffic based on this informa-
tion. The address table supports up to 8K and 16K addresses
(ECN320/ECN330).
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Store-and-Forward Switching – The ECN copies each frame into its
memory before forwarding them to another port. This ensures that all
frames have a standard Ethernet size and have been verified for accu-
racy with the cyclic redundancy check (CRC), thus preventing bad
frames from entering the network and wasting bandwidth. To avoid
dropping frames on congested ports, the ECN provides 32 Mbytes for
frame buffering. This buffer can queue packets awaiting transmission
on congested networks.
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Aggregate bandwidth up to 8.8 Gbps for ECN320 and 10.8 GBPS for
ECN330.
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Packet capacity 8.9 Mpps (million packets per second)
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Filtering and forwarding at line speed
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Broadcast storm control - Broadcast suppression prevents broadcast
traffic from overwhelming the network. When enabled on a port, the
level of broadcast traffic passing through the port is restricted. If broad-
cast traffic rises above a predefined threshold, it will be throttled down
until the level falls back beneath the threshold.
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The ECN supports up to 4094/250 (ECN330/ECN320) tagged Service
VLANs (VLANs used for End-user traffic) based on the IEEE 802.1Q
standard. Service VLANs can be assigned using CLI and PEM. As-
signing a VLAN from the CLI configures the VLAN on all ports.
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Quality of Service (QoS) supports four levels of priority. The ECN priori-
tizes each packet based on the required level of service, using four pri-
ority queues with strict priority and using IEEE 802.1p and 802.1Q tags
to prioritize incoming traffic. These functions can be used to provide in-
dependent priorities for delay-sensitive data and best-effort data.
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Multicast Switching based on IGMP Snooping
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Link redundancy supported by utilizing Rapid Spanning Tree (RSTP).
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Link aggregation by utilizing LACP