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Configuration Guide - Device Management

S7700 and S9700 V200R013C00

This document describes the configurations of Device Management, including device status query, hardware management, CSS, SVF, PoE, OPS, OIDS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP.
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Configuring CSS Software

Configuring CSS Software

Context

Table 3-9 lists the software configuration for establishing a CSS using service port connections.

Table 3-9  Software configuration for establishing a CSS using service port connections
Item Description Remarks
Setting the service port connection mode

Before connecting two switches to establish a CSS, set the service port connection mode on both switches.

When a switch uses SRUDs, the default connection mode is service port connection. When the switch uses other SRUs, the default connection mode is CSS card connection.

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Configuring a CSS ID

The two member switches in a CSS must use different CSS IDs (1 and 2). Switches with the same CSS ID cannot set up a CSS. By default, all switches use CSS ID 1. Before establishing a CSS, change the CSS ID to 2 on one of the member switches.

NOTICE:

Do not change the CSS ID of a member switch after a CSS is established. Otherwise, the CSS splits.

Configuring logical CSS ports

When the service port connection mode is used, you need to configure ports on two switches as physical member ports and add them to logical CSS ports. You can then connect the logical CSS ports to set up a CSS after the switches start. Each switch in the CSS supports two logical CSS ports.

Configure logical CSS ports for the two switches according to connections between them. In 1+0 networking, configure one logical CSS port for each switch. In 1+1 networking, configure two logical CSS ports for each switch.

  • A physical member port can be added to only one logical CSS port.

  • Physical member ports of the same logical CSS port must be on the same card.

  • Physical member ports of a logical CSS port on one switch must connect to physical member ports of a logical CSS port on the other switch.

  • XGE ports derived from a 40GE port cannot be added to a logical CSS port.

  • When a service port is configured as a physical member port, CRC errors may occur on the port. To avoid this problem, run the shutdown command to shut down the port before configuring it as a physical member port.

(Optional) Configuring a CSS priority

CSS priority determines the roles of member switches during role election. A larger priority value indicates a higher priority and therefore a higher probability that a member switch is elected as the master switch.

By default, the CSS priority of a switch is 1.

However, if a switch with the highest priority starts slowly, it cannot be the master switch. If you want a switch to be the master switch, start the switch first.

When two switches complete the start at the same time, the switch with the higher CSS priority becomes the master switch.

(Optional) Specifying the master switch forcibly

The master switch of a CSS is typically elected when the CSS is set up. You can also forcibly specify one switch as the master switch of a CSS.

If this step is performed on two switches before they set up a CSS, the configuration does not take effect after the CSS is set up. The master switch of the CSS is elected through role election.
NOTICE:

After a switch is manually specified as the master switch, a forcible master/standby switchover may occur when both switches run normally. If a master/standby switchover occurs, network services may be affected. Therefore, specifying the master switch forcibly is not recommended.

Enabling the CSS function and restarting switches

By default, the CSS function is disabled on a switch.

The CSS function must be enabled on both two member switches.

You can run the display css status [ saved ] command to check whether the CSS function is enabled on the current switch. If the parameter saved is set, you can view the saved CSS configuration.

Procedure

  1. Run the system-view command to enter the system view.
  2. Run the set css mode lpu command to set the service port connection mode.
  3. Run the set css id new-id command to set a CSS ID for the switch.
  4. Run the interface css-port port-id command to enter the logical CSS port view.
  5. Run the port interface { interface-type interface-number1 [ to interface-type interface-number2 ] } &<1-10> enable command to configure a service port as a physical member port and add it to a logical CSS port.

    After a port is configured as a physical member port of a logical CSS port, this port is no longer used for service forwarding. All CSS-irrelevant commands on the port are deleted and only basic interface configuration commands, such as description (interface view) are retained on the port.

  6. Run the quit command to return to the system view.
  7. (Optional) Run the set css priority priority command to set a CSS priority for the switch.
  8. (Optional) Run the css master force command to specify the switch as the master switch.
  9. Run the css enable command to enable the CSS function on the switch.

    After you enable the CSS function, the system prompts you to restart the switches. Enter Y to restart the switches; otherwise, configurations cannot take effect, and the CSS cannot be established.

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Updated: 2019-04-20

Document ID: EDOC1100065738

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