Product Description Version Description The functional version of EX1 boards is SL91. Application EX1 boards provide large-capacity Ethernet aggregation links between a microwave network and the local metropolitan area network. Access of Ethernet Services at an Aggregation Site for Upstream Transmission The upstream capacity of a high-density aggregation site is usually higher than 1 Gbit/s. A single port on an EX1 board can provide a 10 Gbit/s bandwidth. It is unnecessary to configure multiple GE ports into a LAG for load sharing. The use of EX1 boards can reduce deployment costs and simplify installation. Functions and Features EX1 board receive/transmit, process, and converge 1x10GE service signals. Table 1 lists the functions and features supported by EX1 boards. EX1 boards implement Ethernet service functions by working with packet switching units on the CSHNA board. Table 1 Functions and features that EX1 boards support Function and Feature Description Basic functions Receives/Transmits 10GE service signals, and processes these signals by working with the packet switching unit. Port specifications 10GE port One (XFP optical module) Backplane bus bandwidth 10 Gbit/s Switching mode Centralized mode NOTE: When a board works in centralized mode, all Ethernet services carried on the board must be forwarded by the packet switching unit of the cooperating system control board. Port attributes Working mode Supports the 10 Gbit/s full-duplex mode and supports the LAN or WAN mode. Tag attributes The tag attribute can be tag aware, access, or hybrid. Sets and queries the tag attribute of a port. Jumbo frames Supports jumbo frames with a maximum length of 9600 bytes. Traffic control Supports port-based traffic control that complies with IEEE 802.3x. Services Native Ethernet services E-Line services Port-based E-line services VLAN-based E-line services E-Line services carried by QinQ links E-LAN services E-LAN services based on IEEE 802.1d bridges E-LAN services based on IEEE 802.1q bridges E-LAN services based on IEEE 802.1ad bridges PWE3 Ethernet services E-Line services carried by PWs E-Aggr services carried by PWs E-LAN services carried by PWs, that is, virtual private LAN services (VPLSs), supported only when the system control, switching, and timing board is an SLB2CSHN or CSHNA board LAG Inter-board LAG Supported Intra-board LAG Supported ERPS Supported (complies with ITU-T G.8032 v1/v2) MPLS functions Refer to the description of MPLS/PWE3 functions provided in the sections about system control, switching, and timing boards. PWE3 functions Spanning Tree Protocol (STP) Supports Multiple Spanning Tree Protocol (MSTP) that runs only Common and Internal Spanning Tree (CIST) instances. This type of MSTP provides the same functions as Rapid Spanning Tree Protocol (RSTP). IGMP Snooping Supported LPT Supported Port mirroring Supported LLDP Supported QoS DiffServ Supports simple traffic classification by specifying per-hop behaviors (PHBs) for traffic flows based on their QoS information, such as C-VLAN priorities, S-VLAN priorities, DSCP values, or MPLS EXP values. Complex traffic classification Supports traffic classification based on the following information carried by packets: SAMC, DMAC, C-VLAN IDs, S-VLAN IDs, C-VLAN priorities, S-VLAN priorities, C-VLAN IDs + C-VLAN priorities, S-VLAN IDs + S-VLAN priorities, or DSCP values. Committed access rate (CAR) Provides the CAR function for traffic flows at ports. Queue scheduling policies SP WRR SP+WRR Congestion avoidance Supports tail drop and weighted random early detection (WRED). Traffic shaping Supports shaping for a specified port, priority queue, or service flow, and supports a step of 64 kbit/s for the peak information rate (PIR) and committed information rate (CIR). ETH OAM Ethernet service OAM Supports ETH OAM functions that comply with IEEE 802.1ag. Supports frame loss measurement, frame delay measurement, and delay variation measurement functions that comply with ITU-T Y.1731. Ethernet port OAM Supports ETH OAM functions that comply with IEEE 802.3ah. Remote network monitoring (RMON) Supported Clock Physical layer synchronization Synchronous Ethernet Physical-layer clock protection Protection implemented by providing clock sources with different priorities Protection implemented by running the Synchronization Status Message (SSM) protocol Protection implemented by running the extended SSM protocol Packet time synchronization Supports IEEE 1588v2 time synchronization. Supports ITU-T G.8275.1 time synchronization. Packet frequency synchronization Supports IEEE 1588v2 frequency synchronization. Supports IEEE 1588 ACR. Data communication network (DCN) Inband DCN Each port provides one inband DCN channel. Operation and management Loopback Supports inloops at the PHY layer of Ethernet ports. Supports inloops at the MAC layer of Ethernet ports. Warm and cold resetting Supported Manufacturer information query Supported Power consumption query Supported Voltage monitoring Supported Temperature monitoring Supported XFP module information query Supported Parent topic: EX1 Working Principle and Signal Flow This section describes how the function units of an EX1 board process 10GE signals. Function Block Diagram Figure 1 EX1 board function block diagram Signal Processing in the Receive Direction Table 1 Signal processing in the receive direction of an EX1 board Step Function Unit Processing Flow 1 10GE signal access unit Receives 10GE signals. Performs restructuring, decoding, and serial/parallel conversion for 10GE signals. Performs frame delimitation, preamble stripping, cyclic redundancy check (CRC), and Ethernet performance measurement for frame signals. 2 Ethernet processing unit Adds tags identifying ingress ports to Ethernet data frames. Processes VLAN tags in Ethernet data frames. Processes labels in MPLS/PWE3 packets. Performs QoS processing such as traffic classification and CAR traffic monitoring for Ethernet data frames. Forwards Ethernet data frames to the logic processing unit. 3 Logic processing unit Transmits Ethernet data frames to the main and standby packet switching units.
