Section 15.1.2.1 – Westermo RedFox Series User Manual
Page 327
Westermo OS Management Guide
Version 4.17.0-0
Note
It is possible to connect uplinks of a WeOS dual-homing switch to any layer-2
topology, but failover performance is optimised for FRNT rings.
When connecting uplinks to LAN topologies other than FRNT the synchro-
nised option in dual-homing must be disabled, see
, other-
wise the uplinks will not come up.
describes the synchronised dual-homing function, illustrates
how you can combine Multi-Link Dual-Homing and FRNT Ring Coupling, support-
ing topologies where you can connect the dual-homing uplinks to two adjacent
FRNT rings.
presents the possibility of using multiple instances of dual-homing.
15.1.2.1
Synchronized Dual-Homing
WeOS Multi-Link Dual-Homing provides a mechanism referred to as synchronised
dual-homing. Synchronised dual-homing has two purposes:
❼ Integrity of the uplink: A dual-homing switch monitors uplink connectivity
by exchanging specific echo packets with the remote switch. This ensures
that a link break is detected even in cases where intermediate transceivers
do not propagate link down.
❼ Define preferred uplink when connecting two adjacent FRNT rings: It is pos-
sible to connect the uplinks of a dual-homing node to two adjacent FRNT
rings, which in turn are connected by ring coupling. The synchronised dual-
homing feature will give preference to the uplink connected to a ring cou-
pling sub-ring, i.e., the ring containing the RiCo nodes. More details later in
this section.
If you wish to connect a dual-homing switch to topologies other than FRNT you
need to disable the synchronised dual-homing feature in the dual-homing node.
An example is given below where ports 1 and 2 are configured as uplinks to non-
FRNT nodes.
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