Ericsson EFN324, User Manual, Page: 76 / 176

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9 Network Functions
This section describes network features in the EFN324.
Rapid Spanning Tree, which applies only to stand­alone nodes, is described in
section 9.1 on page 72.
The ARP and DHCP tag is described in section 9.2 on page 75.
9.1 Rapid Spanning Tree
Spanning Tree Protocols may be used to build redundant network structures.
Rapid Spanning Tree (RSTP) offers a much faster convergence time than the
original Spanning Tree (STP) standard. The RSTP implementation is
backward compatible with STP. If there still are switches supporting only STP,
STP is used in network paths where there is no RSTP support.
RSTP or STP is primarily used in the following two cases:

To select one of two redundant uplinks.

To select the uplink ports in a daisy chain where each end node has an
uplink.
Note: Spanning tree protocols are only supported for stand­alone nodes.
Embedded nodes must not have redundant uplinks or uplinks at both
ends of a daisy chain.
In the EFN324, the rapid_spanning_tree and spanning_tree objects are used
to control the spanning tree algorithms.
The EFN324 must not be configured as the root of the tree. A maximum of two
(2) EFN324 Ethernet access switches can be located in the same tree.
For stand­alone nodes, both daisy chained and single node redundancy
scenarios are supported, as illustrated in Figure 29 on page 73 and Figure 30
on page 73, respectively.