CSS Problems Summary

CSS Problems Summary

How Does the CSS ID of an Interface Change After Two Switches Constitute a CSS?
After CSS is enabled, restart the device. A CSS ID different from the master device's CSS ID is allocated to the slave device's interface. To cancel the CSS ID, disable CSS and restart the device.

What Is the Relationship Between the Configurations of Two Devices in the CSS?
The CSS starts with the master device's configuration. After the CSS starts, the slave device's configuration is lost.

How Many Switches Can Constitute a CSS?
Currently, only two switches can constitute a CSS. One device functions as the master device and the other device functions as the slave device.

Are Services Interrupted When One Device Leaves the CSS?
When one device leaves the CSS, services on the device are interrupted.

Are Services Interrupted When One Device Joins the CSS?
When one device joins the CSS, the slave device will restart. As a result, the configuration on the slave device is lost and services on the slave device are interrupted.

Are Services Interrupted When the CSS Splits?
When the CSS splits, the slave device becomes the master device and the two devices work independently. Services across the two devices are interrupted. If DAD is configured, some interfaces will be shut down, and services on the interfaces are affected.

One GE Interface on Each of the Two Devices in the CSS Functions as the Eth-Trunk Member and Connects to the Eth-Trunk of the Peer Device. Can One GE Interface Be Shut Down Automatically After the CSS Splits?
The GE interface cannot be shut down automatically. After the CSS splits, interface retains original settings.

Do CSS Cards and Cables Support Hot Swap?
The S7700 and S9700 CSS cards do not support hot swap and the S12700 CSS cards support hot swap. Cluster cables are hot swappable, but the CSS bandwidth is affected.

What Is the CSS Card's Bandwidth of the S7706/S7712? Are Services Interrupted and Packets Are Discarded When One CSS Cable Is Removed?
Each CSS cable supports 16 Gbit/s of bandwidth. Each CSS card has four ports and provides 64 Gbit/s of bandwidth.

If one link is faulty, the CSS bandwidth is reduced by 12.5% to 25%. When one CSS cable is removed, packets are lost.

Does the CSS Function Require the License?
The CSS function does not require the license.

Which Device's MAC Address Is Used as the CSS's MAC Address After a CSS Is Formed? Does the CSS's MAC Address Change if the CSS Splits?
After a CSS is set up, the master device's MAC address is used as the system MAC address.

After a CSS splits, separate the devices manually, for example, shut down the interfaces between master and backup devices or restart the devices, if DAD is not configured.
If the master election starts again, the master switch is elected according to the election rule.
What Are the Limitations After CSS Is Enabled?
The CSS does not support clock, and WAN features. The interface number format changes to the four-dimensional format, for example, GE2/1/0/1, the value 2 indicates the chassis ID.