Technical Reference; Mstp Network Example - ZyXEL Communications GS1920v2 Series User Manual

13.10 T e c hnic a l Re fe re nc e
This section provides technical background information on the topics discussed in this chapter.
13.10.1 MST P Ne two rk Exa m ple
The following figure shows a network example where two VLANs are configured on the two switches. If
the switches are using STP or RSTP, the link for VLAN 2 will be blocked as STP and RSTP allow only one link
in the network and block the redundant link.
STP/RSTP Network Example
Fig ure 115
VLAN 1
With MSTP, VLANs 1 and 2 are mapped to different spanning trees in the network. Thus traffic from the
two VLANs travel on different paths. The following figure shows the network example using MSTP.

MSTP Network Example

Fig ure 116
VLAN 1
Chapter 13 Spanning Tree Protocol
A
VLAN 2
B
A
VLAN 2
B
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