Lost bandwidth when a CSS cable of the CSS composed of S7700 switches is disconnected

26

For the CSS composed of switches that use the SRUB, if a link from the active SRUB to the standby SRUB is disconnected, the CSS bandwidth is reduced by 25%.
Protocol packets of the standby switch must be sent to the master switch through the active SRUB. After the link is disconnected, the protocol packets that are forwarded to the master switch from the LPU of the standby switch through the chip cannot reach the active SRUB. The forwarding chip must be isolated to prevent packet loss. The forwarding chip is connected to two CSS links, so the two CSS links are unavailable and the CSS bandwidth is reduced by 25%.
After a CSS is set up, the active SRUB of the master switch is used as the system active SRUB and the active SRUB of the standby switch becomes the system standby SRUB.

Other related questions:
CSS modes on S series modular switches
S series modular switches support CSS card connection and service port connection. CSS card clustering: Member switches are connected using dedicated CSS cards and cluster cables. Service port clustering: Member switches are connected using common service ports, without a need for dedicated CSS cards. The service port connection mode occupies service ports and requires at least 10GE ports on LPUs. The S7706/S7712, S9706/S9712, and S9306/S9312 support CSS card connection and service port connection; but the S12700 supports only CSS card connection. Purchase CSS cards when the CSS card connection mode is used. When the service port connection mode is used, the S9306/S9312 requires the license whereas other models do not require the license. Typical CSS Configuration in Typical Configuration Examples describes the CSS support, CSS mode, hardware requirements, typical networking, and configuration procedure. For details on software and hardware requirements of S7700&S9700 CSS, see "Software and Hardware Requirements for the CSS Card Connection Mode" and "Software and Hardware Requirements on the Service Port Connection Mode" in S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples-Typical CSS Configuration of Modular Switches. For details about on software and hardware requirements of the S12700 CSS, see "Software and Hardware Requirements for the CSS Card Connection Mode" and "Software and Hardware Requirements on the Service Port Connection Mode" in S12700 Typical Configuration Examples- Typical CSS Configuration of Modular Switches. For details about on software and hardware requirements of the S9300 CSS, see "Software and Hardware Requirements for the CSS Card Connection Mode" and "Software and Hardware Requirements on the Service Port Connection Mode" in Sx300 Series Switches Typical Configuration Examples- Typical CSS Configuration of Modular Switches.

Are services affected when one CSS cable is removed from a CSS composed of S series modular switches
Removing a CSS cable results in packet loss in a CSS. The bandwidth cannot meet the requirements when there is heavy traffic.

How to restore a CSS port to a service port for the CSS composed of S series modular switches
Perform either of the following operations: 1. In non-CSS scenarios, to restore a physical member port to a service port on a standalone switch, run the undo interface css-port command in the system view. 2. In CSS scenarios, to restore a physical member port to a service port in a CSS, run the shutdown interface ** command in the logical CSS port view (run the interface css-port port-id command to enter the view) to shut down the physical member port and then run the undo port interface ** enable command.

Are cables connected or CSS is configured first when S series modular switches establish a CSS
When S series modular switches establish a CSS, you are advised to connect cables before CSS configuration. For details on CSS setup and configuration of S7700&S9700

How to install a CSS card on an S series switch
For details about how to install a CSS card on S7700&S9700 series, see "(Optional) Installing a CSS Subcard or an Enhanced Flexible Service Subcard" at S7700&S9700 Hardware Installation and Maintenance Guide-Installing Modules. For details about how to install a CSS card on S12700 series, see "(Optional) Installing a CSS Subcard" at S12700 Hardware Installation and Maintenance Guide-Installing Modules. For details about how to install a CSS card on S9300 series, see "(Optional) Installing a CSS Subcard or an Enhanced Flexible Service Subcard" at S9300 Hardware Installation and Maintenance Guide-Installing Modules.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top