Zyxel OLT2412 [111/326] Mstp network example

Zyxel OLT2412 [111/326] Mstp network example
Chapter 13 Spanning Tree Protocol
OLT2412 User’s Guide
111
One Common and Internal Spanning Tree (CIST) that represents the entire network’s
connectivity.
Grouping of multiple bridges (or switching devices) into regions that appear as one single bridge
on the network.
A VLAN can be mapped to a specific Multiple Spanning Tree Instance (MSTI). MSTI allows
multiple VLANs to use the same spanning tree.
Load-balancing is possible as traffic from different VLANs can use distinct paths in a region.
13.1.4.1 MSTP Network Example
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.
Figure 33 STP/RSTP Network Example
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.
A
B
VLAN 1
VLAN 2

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