Cluster indicator on S series modular switches

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For S7700/S9300 series switches, when two switches with SRUAs/SRUBs and the ES02VSTSA/LE0D0VSTSA00 CSS cards establish a CSS successfully, the indicator status is as follows:
1. The MASTER indicator on only one CSS card is steady green.
2. On one switch, the CSS ID indicators numbered 1 on both CSS cards are steady green. On the other switch, the CSS ID indicators numbered 2 on both CSS cards are steady green.
3. The ACT/LINK indicators on all CSS cards are steady green.

For S9700 series switches, when two switches with SRUCs and the EH1D2VS08000 CSS cards establish a CSS successfully, the indicator status is as follows:
1. The MASTER indicator on only one CSS card is steady green.
2. On one switch, the CSS ID indicators numbered 1 on both MPUs are steady green. On the other switch, the CSS ID indicators numbered 2 on both MPUs are steady green.
3. The LINK/ALM indicators on all CSS cards are steady green.

For S7700&S9700&S9300 series switches, when two switches establish a service port clustering successfully, the indicator status is as follows:
1. On one switch, the ACT indicator on an MPU is steady green. On the other switch, the ACT indicator on an MPU is blinking green.
2. All the LINK indicators for physical member ports on service cards are steady green.
3. When SRUCs (S9700) are used, the CSS ID indicator numbered 1 on an MPU of one switch is steady green, and the CSS ID indicator numbered 2 on an MPU of the other switch is steady green.

For S12700 series switches, when two switches establish a CSS successfully, the indicator status is as follows:
1. The CSS MASTER indicator on only one MPU is steady green, the MASTER indicators on all CSS cards installed on the same switch with the MPU are steady green, and the MASTER indicators on all CSS cards installed on the another switch is off.
2. On one switch, the CSS ID indicators numbered 1 on both MPUs are steady green. On the other switch, the CSS ID indicators numbered 2 on both MPUs are steady green.
3. The LINK/ALM indicators of ports on all CSS cards connected to cluster cables are steady green.

For details about the indicator status, see the page on the right.

Other related questions:
Whether the cluster on S series modular switches needs a license
For S7700 and S9700 series switches, licenses are not required for CSS card and service port clustering. Licenses are not required for S12700 clustering. For S9300 series switches, licenses are not required for CSS card clustering, but required for service port clustering.

What is the function of the cluster priority on S series modular switches
For S series modular switches, the clustering priority of a member switch determines the role of the member switch in role election. A larger value indicates a higher priority and higher probability that the member switch is elected as the master switch. However, if a switch with a high priority starts slowly, it cannot be the master switch. If you want a switch to be the master switch, start the switch first. Election rules for an S series master switch: 1. The switch that starts and enters the single-chassis CSS state first becomes the master switch. 2. If the two switches complete startup at the same time, the switch with a higher priority becomes the master switch. 3. If the two switches complete startup at the same time and have the same priority, the switch with a smaller MAC address becomes the master switch. 4. If the two switches complete startup at the same time and have the same priority and MAC address, the switch with a smaller CSS ID becomes the master switch.

Can S series modular switches of different versions establish a cluster
CSS technology provides an automatic software loading mechanism. Member switches do not have to run the same software version, and they can set up a CSS as long as the software versions running on the member switches are compatible with one another. If software version running on the standby switch is different from that on the master switch, the standby switch downloads the system software from the master switch, restarts with the new system software, and joins the CSS again.

Cluster connection alarm on S series modular switches
For S series modular switches, alarms on incorrect CSS cable connections are as follows: For S7700&S9300 series switches, the OIDs for the ES02VSTSA/LE0D0VSTSA00 CSS card are 1.3.6.1.4.1.2011.5.25.183.3.3.2.4 hwCssConnectError and 1.3.6.1.4.1.2011.5.25.183.3.3.2.19 hwCssPhyCardConnectError. For S9700 series switches, the OID for the EH1D2VS08000 CSS card is 1.3.6.1.4.1.2011.5.25.183.3.3.2.15 hwCssPhyVs08ConnectError. For S12700 series switches, the OID for the EH1D2VS08000 CSS card is 1.3.6.1.4.1.2011.5.25.183.3.3.2.15 hwCssPhyVs08ConnectError. For S7700&S9700&S9300 series switches, the OID for service port clustering connection alarms is 1.3.6.1.4.1.2011.5.25.183.3.3.2.8 hwCssPhyCsuConnectError. You can obtain the following information from the alarm message: 1. CSS ID, slot ID, and number of the CSS port where the cluster cable is incorrectly connected 2. Correct connection of the cluster cable For details, see the page on the right.

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