Hirschmann RS20 User Manual page 92

Spanning Tree
a. Bridges that conform with IEEE 802.1D 1998 and only support 16-bit values for the path
costs should use the value 65,535 (FFFFH) for path costs when they are used in conjunction
with bridges that support 32-bit values for the path costs.
Note: If link aggregation
combine the connection lines between devices into a trunk, then the
automatically specified path costs are reduced by half.
92
(see on page 15 "Link Aggregation")
6.1 The Spanning Tree Protocol
UM RedundConfig L2P
is used to
Release 8.0 05/2013