Westermo RedFox Series User Manual
Page 328
Westermo OS Management Guide
Version 4.17.0-0
Example
example:/#> configure
example:/config/#> dual-homing
Creating new instance 1
example:/config/dual-homing-1/#> uplink 1
example:/config/dual-homing-1/uplink-eth1/#> priority 100
example:/config/dual-homing-1/uplink-eth1/#> end
example:/config/dual-homing-1/#> uplink 2
example:/config/dual-homing-1/uplink-eth2/#> end
example:/config/dual-homing-1/#> no synchronized
example:/config/dual-homing-1/#> leave
Starting Ring Coupling/Dual-Homing daemon .................. [ OK ]
Configuration activated.
Remember "copy run start" to save to flash (NVRAM).
example:/#>
Additional remarks if you intend to use dual-homing to connect the uplinks to
other than FRNT nodes.
❼ Fail-over performance: Fail-over performance is optimised when connecting
the dual-homing node to a single FRNT ring, or to two FRNT rings. (Which
in turn may be connected by FRNT ring coupling). In other topologies the
switches may temporarily have stale MAC entries in their learning caches
for a short period of time (unicast traffic). Furthermore, if IGMP snooping is
used multicast traffic will also be disrupted until switches receive new IGMP
Reports via the new uplink.
❼ Integrity of the uplink: With synchronised dual-homing disabled, the uplink
status is determined based on its physical status (up/down). If you wish ad-
ditional control in this case, you could consider running LACP on the uplink,
i.e., you could create a link-aggregate with the uplink as the only member
link. See
for further information on LACP and link aggregation.
It is possible to combine the use of Multi-Link Dual-Homing and FRNT Ring Cou-
pling.
shows how a dual-homing node can be connected to two adjacent
FRNT rings, and
illustrates an example with several dual homing nodes.
The synchronised dual-homing feature will give preference to the uplink leading
to the FRNT ring containing RiCo nodes (the ring coupling ”sub-ring”). This means
that the ’left’ dual-homing uplink (port ’1’) in
will be active as long as a
RiCo node in that ring is reachable, and in turn has an active uplink.
To ensure that the dual-homing node fail-over to the other uplink (the ’right’
uplink (port ’2’) in
) if no RiCo node is reachable via the sub-ring, port
’2’ should be configured with better uplink priority, see also
. A
configuration example is given below.
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