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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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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

NOTE:

Only the S7710 supports this function.

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

S7710 can have independent SFUs installed. If an MPU is faulty, services on the MPU will be switched to SFUs, reducing the impact on services and implementing single-MPU (no MPU on the standby chassis) clustering. The following example uses inter-chassis forwarding of unicast packets to compare 1+N backup of MPUs in a cluster with the traditional CSS card connection modes and illustrate how 1+N backup of MPUs is implemented in CSS2.

Clustering through CSS cards on MPUs

Inter-chassis unicast packets are forwarded along the following path: SFU on the MPU of the local chassis → CSS card on the local chassis → cluster cable → SFU on the MPU of the peer chassis → LPU on the peer chassis → the corresponding port, as shown in Figure 3-11.

Figure 3-11  Inter-chassis unicast packet forwarding in clustering through CSS cards on MPUs

Clustering through service ports

Inter-chassis unicast packets are forwarded through the SFUs of both the local and peer chassis before they reach the corresponding port, as shown in Figure 3-12. The packet forwarding process is similar to that in clustering through CSS cards on MPUs.

Figure 3-12  Inter-chassis unicast packet forwarding in clustering through service ports

Clustering through CSS cards on SFUs

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, as shown in Figure 3-13.

Figure 3-13  Inter-chassis unicast packet forwarding in clustering through CSS cards on SFUs

Unlike clustering through CSS cards on MPUs and clustering through service ports, clustering through CSS cards on SFUs forwards packets through SFUs directly, removing the need to send packets to MPUs. In addition, the LPUs function normally and data packets are forwarded without interruptions 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, indicating 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. You are advised to install an MPU to the standby chassis to improve system reliability.

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 is suited to the following scenarios:
  • The CSS is required to run normally when both MPUs in one chassis are faulty.
  • Two switches with one MPU installed on each set up a CSS. The CSS is required to transmit services normally when you replace the MPU in one chassis.
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Updated: 2019-04-20

Document ID: EDOC1100065738

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