Cambium Networks PTP 820 Series, User Manual

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Chapter 8: Ethernet Protocols Configuring MSTP
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MSTP Overview
MSTP, as defined in IEEE 802.1q, provides full connectivity for frames assigned to any given VLAN throughout a
bridged LAN consisting of arbitrarily interconnected bridges.
With MSTP, an independent multiple spanning tree instance (MSTI) is configured for each group of services, and
only one path is made available (unblocked) per spanning tree instance. This prevents network loops and provides
load balancing capability. It also enables operators to differentiate among Ethernet services by mapping them to
different, specific MSTIs. The maximum number of MSTIs is configurable, from 2 to 16.
MSTP is an extension of, and is backwards compatible with, Rapid Spanning Tree Protocol (RSTP).
PTP 820G and PTP 820F supports MSTP according to the following IEEE standards:
•
802.1q
•
802.1ad amendment (Q-in-Q)
•
802.1ah (TE instance)
For a more detailed description of MSTP support in the PTP 820G or PTP 820F, refer to the Technical Description
for the product you are using.
Mapping Ethernet Services to MSTP instances (MSTIs)
Ethernet services can be mapped to MSTP instances (MSTIs) in the Instances per Service Mapping section of the
Ethernet General Configuration page. All mapping of Ethernet services to MSTP instances (MSTIs) should be
performed before enabling MSTP.
Note
Ethernet service-to-MSTI mapping is also a prerequisite to configuring G.8032. See Configuring
G.8032 .
To map Ethernet services to MSTP instances (MSTIs):
1 Select Ethernet > General Configuration . The Ethernet General Configuration page opens ( Figure 198 ).
2 In the Instance per Service Mapping table, select the Service ID of the service you want to map.
3 Click Edit . The Instance per Service Mapping – Edit page opens.