Cisco Systems A9014CFD Configuring MST on EVC Bridge Domain

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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
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Chapter 13 Configuring MST on EVC Bridge Domain
Contents
Gi12/5 Root FWD 20000 128.2821 P2p
Gi12/6 Altn BLK 20000 128.2822 P2p
nPE1#
Configuring MST on EVC Bridge Domain
Figure 13-1 shows an example of the untagged EVCs that do not participate in MST loop detection.
When you link your networks together as shown below, a loop is caused since MST is not running on
the untagged EVCs.
Figure 13-1 Untagged EVCs not participating in MST loop detection