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Contents

Panel

Table of Contents

Introduction

You can optionally deploy a pair of

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devices for High Availability. High Availability (HA) protects SIP to SIP calls using
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HA functionality. HA functionality enhances resiliency by offering Active and Standby SWe Edge instances. When the Active instance fails during a call, the Standby instance takes over call management to maintain the call.

The Active and Standby SWe Edge instances operate using a single HA license. At the time of initial setup, you install the HA license on the Active instance. Once accepted, the HA system replicates the information to the Standby instance.

Provisioning for HA can only be done at the time of initial installation and only for a pair of devices that solely support SIP to SIP calls. Additional limitations apply. See Limitations.

For installation and HA activation instructions, refer to Workflow for Initial Setup - High Availability.

Architecture

In an

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High Availability setup, two
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 devices share the responsibility of the HA function. Each device’s gigabit Ethernet 5 (ge5) port (internal Bridge 4, SBC SWe Edge logical interface Ethernet 3 in the following example) serves the WAN side of the network. The ge1 port (internal Bridge 1, SBC SWe Edge logical interface Ethernet 1) serves the LAN side of the network. Each device has a unique IP address for its management connection (Admin port ge7). The two devices physically connect through a back-to-back Ethernet connection of their corresponding HA interface ports (ge6 in the following example).

During the initial setup, the Standby device (and Active devices, shown as 8300-1 and 8300-2 in the example) receives its following diagram, each receive their own Eth1 and Eth3 IP address assignments using the static IP assignment method. (IP Assign Method: Static). The HA IP addresses must be at least three numbers apart. Example: 10.10.10.50 and 10.10.10.21.) Once you enable HA, the Standby instance monitors the Active instance through the HA interface (port ge6). When a failover occurs, the HA function assigns the Eth1 and Eth3 addresses from the (former) Active instance to the Standby instance, and the Standby instance acts as the new Active instance to process calls.

The following diagram depicts a typical HA setup. Your network administrator will assign specific IP addresses to suit the needs of your particular network topology. The physical ports associated with the

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Bridge 1 assignments supporting the LAN network can be any of the available ge1 through ge8 ports, exclusive of the port used for the HA interface (shown as ge6 in the example). Likewise, the physical port associated with the
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 Bridge 4 assignment supporting the WAN network can be any of the available ge1 through ge8 ports, exclusive of the port being used for the HA interface, or one of the available SFP ports, sfp9 or sfp10.

HA Architecture: Deployment Example

Limitations 

The following limitations apply for

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HA functionality:

  • Deployment
    • HA can only be provisioned at the time of initial installation.
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      does not offer a path for stand-alone (SA) to HA conversion.
    • High Availability through a pair of
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       devices only applies to SIP to SIP calls (excludes analog)      .
    • HA ports connecting two devices are only allowed on the same subnet.
    • The HA interface requires a single back-to-back Ethernet cable connecting the HA ports of the two
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       devices.
    • DHCP on the HA Interface is not supported.
    • Geo Redundancy is not supported. The two
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       devices must be co-located.
    • Spacevars
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       devices only support floating IPs on the packet interfaces, not the HA or Admin interfaces.
    • Spacevars
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       devices do not support card redundancy or port redundancy.
  • Data Replication

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  • Call Features
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  • Others
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    • The Edge
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       does not support card redundancy or port redundancy.

Licenses

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