Port Identifier - Hirschmann RS20 Programming Manual

Rapid Spanning Tree
Data rate Recommended value
<=100 KBit/s 200.000.000*
1 MBit/s 20.000.000*
10 MBit/s 2.000.000*
100 MBit/s 200.000*
1 GBit/s 20.000
10 GBit/s 2.000
100 GBit/s 200
1 TBit/s 20
10 TBit/s 2
Table 12: Recommended path costs for RSTP based on the data rate
* Bridges that conform with IEEE 802.1D, 1998 edition, and only support 16-bit
values for the path costs should use the value 65 535 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.

6.1.5 Port Identifier

The Port Identifier consists of 2 bytes. One part, the lowest-value byte, signi-
fies the fixed relationship with the physical port number. This part ensures
that no port of a bridge has the same identifier as another port of this bridge.
The second part is the port priority, which is specified by the Administrator
(default value: 128). It also applies here that the port with the smallest
number for the port identifier has the highest priority.
86
Recommended range
20.000.000-200.000.000 1-200.000.000
2.000.000-200.000.000
200.000-20.000.000
20.000-2.000.000
2.000-200.000
200-20.000
20-2.000
2-200
1-20
(see on page 11 „Link Aggregation")
6.1 The Spanning Tree Protocol
Possible range
1-200.000.000
1-200.000.000
1-200.000.000
1-200.000.000
1-200.000.000
1-200.000.000
1-200.000.000
1-200.000.000
is used to
Redundanz L2P
Release 5.0 04/09