300-515 SPVI: Implementing Cisco Service Provider VPN ServicesDemo

By Cisco · Question Mode

QuestionQ19

Layer 2 VPNs

In an Ethernet Virtual Circuit environment, what restriction applies to bridge domains when STP is running?

  • A The STP mode must be RSTP or PVST+
  • B Bridge domains must be mapped to a different VLAN.
  • C The STP mode must be MSTP
  • D Bridge domains must belong to different MST instances.
Explanation

STP on EVC bridge domains is supported through IEEE 802.1s Multiple Spanning Tree. MST must therefore be configured; service instances are mapped to MST instances by VLAN ID.

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