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S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
1+N Backup of MPUs in a Cluster

1+N Backup of MPUs in a Cluster

1+N backup of MPUs enables a CSS2 cluster to run stably as long as one MPU of either chassis in the cluster is working normally.

The hardware architecture of the S12700 separates the switching plane from the control plane. Therefore, data forwarding is not affected when an MPU is faulty.implementing single-MPU (no MPU on the standby chassis) clustering. The following example describes inter-chassis forwarding of unicast packets to compare 1+N backup of MPUs in a cluster with the traditional CSS connection modes, and illustrates how 1+N backup of MPUs is implemented in CSS2.

Clustering using CSS cards on MPUs: In Figure 8-11, inter-chassis unicast packets are forwarded along the following path: SFU on an MPU of the local chassis → CSS card on the local chassis → cluster cable → SFU on an MPU of the peer chassis → LPU on the peer chassis → the corresponding port.

Figure 8-11  Inter-chassis unicast packet forwarding in clustering using CSS cards on MPUs

Clustering using service ports: In Figure 8-12, inter-chassis unicast packets are forwarded through SFUs of both the local and peer chassis before they reach the corresponding port. The packet forwarding process is similar to that in clustering using CSS cards on MPUs.

Figure 8-12  Inter-chassis unicast packet forwarding in clustering using service ports

Clustering using CSS cards on SFUs: In Figure 8-13, inter-chassis unicast packets are forwarded along the following path: SFU of the local chassis → CSS card on the local chassis → cluster cable → SFU of the peer chassis → LPU on the peer chassis → the corresponding port.

Figure 8-13  Inter-chassis unicast packet forwarding in clustering using CSS cards on SFUs

Unlike clustering using CSS cards on MPUs and clustering using service ports, clustering using CSS cards on SFUs forwards packets through SFUs without sending packets to MPUs. In addition, LPUs function normally without affecting data packet forwarding even if all MPUs in either chassis are faulty or removed. If all MPUs of the master switch are faulty or removed, a master/standby switchover is triggered.

CSS2 can run normally even when the standby chassis has no MPU installed. In this process, the cluster sends an alarm every 30 minutes to notify that the standby chassis has no MPU installed. The alarm ID and name are CSSM_1.3.6.1.4.1.2011.5.25.183.3.3.2.16 and hwCssStandbyError. You can run display commands but cannot use configuration commands when the standby chassis has no MPU installed. To improve system reliability, you are advised to install MPUs to the standby chassis.

NOTE:
When setting up a cluster using CSS2, the master switch and standby switch each must have at least one MPU installed. 1+N backup of MPUs in a cluster can meet the following requirements:
  • The CSS runs normally and services are not affected when both MPUs in one chassis are faulty.
  • In a CSS of two switches with one MPU installed on each, replacing MPUs in one chassis does not affect services.
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Updated: 2019-08-21

Document ID: EDOC1000142080

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