Stp Port States; Multiple Rstp; Multiple Stp - ZyXEL Communications GS2210 Series User Manual

Chapter 13 Spanning Tree Protocol

STP Port States

STP assigns five port states to eliminate packet looping. A bridge port is not allowed to go directly
from blocking state to forwarding state so as to eliminate transient loops.
Table 39 STP Port States
PORT STATE DESCRIPTION
Disabled
Blocking
Listening
Learning
Forwarding

Multiple RSTP

MRSTP (Multiple RSTP) is ZyXEL's proprietary feature that is compatible with RSTP and STP. With
MRSTP, you can have more than one spanning tree on your Switch and assign port(s) to each tree.
Each spanning tree operates independently with its own bridge information.
In the following example, there are two RSTP instances (MRSTP 1 and MRSTP2) on switch A.
To set up MRSTP, activate MRSTP on the Switch and specify which port(s) belong to which spanning
tree.
Note: Each port can belong to one STP tree only.
Figure 80 MRSTP Network Example

Multiple STP

Multiple Spanning Tree Protocol (IEEE 802.1s) is backward compatible with STP/RSTP and
addresses the limitations of existing spanning tree protocols (STP and RSTP) in networks to include
the following features:
112
STP is disabled (default).
Only configuration and management BPDUs are received and processed.
All BPDUs are received and processed.
Note: The listening state does not exist in RSTP.
All BPDUs are received and processed. Information frames are submitted to the learning
process but not forwarded.
All BPDUs are received and processed. All information frames are received and forwarded.
GS2210 Series User's Guide