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S7700 and S9700 Series Switches Hardware Installation and Maintenance Guide

This document describes hardware installation procedures of the S7700 and S9700 series switches, troubleshooting methods for common hardware faults, and switch maintenance instructions.
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S9706 and S9712 Clustering Using CSS Cards

S9706 and S9712 Clustering Using CSS Cards


The S9706 and S9712 switches support clustering using Cluster Switching System (CSS) cards. When using this cluster mode, the switches must have double main control units installed. In addition, the main control units must be the EH1D2SRUC000 model and have EH1D2VS08000 CSS cards installed in subcard slots.

  • EH1D2VS08000 is not hot swappable.
  • When installing a copper cable, optical module, or optical fiber, you can determine that it has been installed properly after hearing a click.
  • When removing a copper cable, optical module, or optical fiber, push its connector or handle slightly and then pull it out.
  • Ensure that the bend radius of the copper cables or optical fibers is greater than the minimum bend rand required. For more information, see the Hardware Description.

Related Content

Online Tools

CSS Assistant

Tools and Accessories

  • ESD wrist strap or ESD gloves
  • Phillips screwdriver
  • Diagonal pliers
  • Cable ties
  • Labels


  1. Wear an ESD wrist strap or ESD gloves. When wearing an ESD wrist strap, ensure that the ESD wrist strap is in a close contact with your wrist, and insert the other end in the ESD jack of a cabinet/rack.
  2. Install a CSS card in the subcard slot of each main control unit, as shown in (Optional) Installing a CSS Subcard or an Enhanced Flexible Service Subcard.
  3. Install the main control units in main control slots of the switches, as shown in Installing a Card.
  4. Attach number labels on both ends of the cluster cables.
  5. Connect the stack ports with cluster cables. Each CSS card has eight SFP+ ports, which are divided into two groups. (Group 1 includes ports 1 to 4, and group 2 includes 5 to 8.) See the following figure to connect cables between groups. Ports in a group can be connected in any sequence, but each group must have at least one cable connected. For example, any port in group 1 in chassis 1 can be connected to any port in group 1 in chassis 2.

    • Switches to set up a CSS must have both active and standby MPUs installed.
    • It is recommended that you connect all the CSS ports on the CSS cards.
    • To connect the stack ports with optical fibers, install optical modules on the stack ports, and then connect optical fibers to the optical modules.
    • To connect the stack ports with copper cables, directly connect the copper cables to the stack ports.
    • S9706 switches are used as an example here. Cable connections between S9712 switches are the same.

  6. Arrange the cables, route the cables through cable management frames, and bundle them with cable ties.


    Keep the cable ties used to bundle cables on the same horizontal plane as the SFP+ ports to reduce the impact of gravity on these ports.

  7. (Optional) Wrap redundant cables in cable management trays.

  8. Check the LINK indicator on the service cards. If the indicator is steady green, the ports are correctly connected.

    To power on the switches, ensure that power cables and ground cables are correctly connected and then switch on the external power modules and built-in power modules in turn.

Updated: 2019-05-15

Document ID: EDOC1000069522

Views: 30570

Downloads: 1165

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