Interface Backup; Introduction - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

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ISCOM2600G-HI (A) Series Configuration Guide
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11.2 Interface backup

11.2.1 Introduction

In dual uplink networking, Spanning Tree Protocol (STP) is used to block the redundancy link
and implements backup. Though STP can meet users' backup requirements, it fails to meet
switching requirements. Though Rapid Spanning Tree Protocol (RSTP) is used, the
convergence is second level only. This is not a satisfying performance parameter for high-end
Ethernet switch which is applied to the core of the carrier-grade network.
Interface backup, targeted for dual uplink networking, implements redundancy backup and
quick switching through working and protection lines. It ensures performance and simplifies
configurations.
Interface backup is another STP solution. When STP is disabled, you can realize basic link
redundancy by manually configuring interfaces. If the switch is enabled with STP, you should
disable interface backup because STP has provided similar functions.
When the primary link fails, traffic is switched to the backup link. In this way, not only 50ms
fast switching is ensured, but also configurations are simplified.
Principles of interface backup
Interface backup is implemented by configuring the interface backup group. Each interface
backup group contains a primary interface and a backup interface. The link, where the
primary interface is, is called a primary link while the link, where the backup interface is, is
called the backup interface. Member interfaces in the interface backup group supports
physical interfaces and LAGs. However, they do not support Layer 3 interfaces.
In the interface backup group, when an interface is in Forward status, the other interface is in
Block status. At any time, only one interface is in Forward status. When the Forward interface
fails, the Block interface is switched to the Forward status.
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