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16.4

Managing FRNT settings via the CLI

Command

Configure FRNT settings

[no] frnt [ID]

[no] focal-point ring-ports <PORT-M [, PORT-N]>

Default Section

Section 16.4.1

focal-point

Section 16.4.2

Section 16.4.3

Show FRNT status show rings show ipconfig

Section 16.4.4

Section 7.3.36

16.4.1

Managing FRNT

Syntax [no] frnt [<ID>]

Context

Global Configuration

context

Usage Enter FRNT context of the given FRNT instance ID. Currently only a single

FRNT instance is supported, thus the value of the FRNT ID is ignored.

The FRNT instance is only activated upon the selection of valid FRNT ring ports, see

section 16.4.3

.

Use ”no frnt [ID]” to remove an existing FRNT instance.

Use ”show frnt” to list configured FRNT settings (also available as ”show” command within the

FRNT Configuration

context).

Default values Default ID is 1

16.4.2

FRNT focal point and member switch

Syntax [no] focal-point

Context

FRNT Configuration

context

Usage Configure device to act as FRNT focal point for this FRNT instance. Use

”focal-point” to configure the device to act as an FRNT focal-point, and

”[no] focal-point” to configure the device as an FRNT member switch.

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Use ”show focal-point” to show whether the unit is configured as focalpoint or member switch

Default values focal-point

16.4.3

FRNT Ring Ports

Syntax ring-ports <PORT-M [,PORT-N]>

Context

FRNT Configuration

context

Usage Set the physical ports (Ethernet ports or SHDSL ports) to use as FRNT ports ”M” and ”N”.

For each FRNT instance, there is normally two FRNT ports named Port ”M” and Port ”N”, configured by use the ”ring-ports <PORT-M ,PORT-N>” command.

On a member switch Port ”M” and ”N” have similar roles, however, on a focal point their roles differ - when the ring is fully connected the focal point will put its Port ”M” in BLOCKING state.

Note

For restrictions on how to select FRNT ports, see

section 16.1.2

.

In the special case when you wish to configure a node as FRNT Bus Edge, you only configure port ”M” (”ring-ports <PORT-M>”).

Use ”show ring-ports” to show configured FRNT ring port(s).

Default values Not applicable

16.4.4

Show FRNT ring status

Syntax show rings

Context

Admin Exec

context.

Usage Show status of configured FRNT rings. This will provide information

ˆ whether the ring is up (ring mode) or if the ring is broken (bus mode).

Note: A focal point switch will detect ring failures located anywhere in

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FRNT port is down, or if a neighbour is down).

ˆ If the FRNT ports on this switch are connected in-line with the M/N ports of the focal-point, or if they are logically swapped (i.e., if the FRNT ports’

administrative M/N state equals the operational M/N state, or if ports are swapped).

ˆ The status of the local FRNT ports (UP/DOWN, FORWARDING/BLOCKING).

Default values Not applicable.

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Chapter 17

FRNT Ring Coupling and

Multi-Link Dual Homing

This chapter describes WeOS FRNT Ring Coupling and Multi-Link Dual Homing, two similar layer-2 (switching) fail-over functions.

FRNT Ring Coupling enables bridging of two or more FRNT rings via multiple layer-2 uplinks. Only one uplink is active at a time, while others are hot stand-by

backups, providing redundancy and loop-free connectivity. It is also possible to use FRNT Ring Coupling to bridge an ”FRNT bus” to an FRNT ring, thereby forming a horseshoe topology.

Multi-Link Dual-Homing (or simply ”Dual-Homing”) lets you connect a WeOS switch to a layer-2 topology via multiple uplinks. Optimal fail-over performance is achieved when connecting the dual-homing switch uplinks to a single FRNT ring, or to two adjacent FRNT rings (connected with Ring Coupling), but Dual-Homing can also be used in other layer-2 topologies.

Both FRNT Ring Coupling and Multi-Link Dual-Homing provide fine-grained control of which uplink is to be preferred as active. By default, the link with highest speed/duplex mode is elected. To avoid shifting between active uplinks when a new uplink becomes available, a feature referred to as sticky uplink is provided.

Enabling sticky uplink gives ”zero” fail-over time on link-up and mitigates possible problems with flapping links.

Section 17.1

presents further information on FRNT Ring Coupling and the Multi-

Link Dual-Homing functionality. Web and CLI support for these features are covered in

sections 17.2

and

17.3

respectively.

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