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In a Metro Ring Protocol Configuration, do 'VE interfaces' of other VLANs in the same 'Topology Group' flap, when the primary 'forwarding' interface of the master VLAN goes 'Down'?

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TitleIn a Metro Ring Protocol Configuration, do 'VE interfaces' of other VLANs in the same 'Topology Group' flap, when the primary 'forwarding' interface of the master VLAN goes 'Down'?
Question
In a Metro Ring Protocol Configuration, do 'VE interfaces' of other VLANs in the same topology group flap, when the primary 'forwarding' interface of the master VLAN goes 'Down'?
Environment
  • Netiron
  • MLX/XMR
  • CER/CES
Answer
  • A topology group will be configured with the VLAN configured as master VLAN, which can be verified from the following command:
    • MLX#show metro-ring
      • A topology group is a named set of VLANs that share a Layer 2 control protocol. Topology groups simplify configuration and enhance scalability of Layer 2 protocols by allowing you to run a single instance of a Layer 2 protocol on multiple VLANs, where this one instance of the Layer 2 protocol controls all the VLANs.
      • The master VLAN contains the configuration information for the Layer 2 protocol.
      • The member VLANs are additional VLANs that share ports with the master VLAN.
  • The Layer 2 protocol settings for the ports in the master VLAN apply to the same ports in the member VLANs. A change to the master VLAN’s Layer 2 protocol configuration or Layer 2 topology affects all the member VLANs. Member VLANs do not independently run a Layer 2 protocol.
  • When primary interface of the master VLAN flaps, protocol convergence takes place and the secondary interface will transition from 'Blocking' to 'Forwarding'.
  • Since all member VLANs are in-sync with the port state of the master VLAN, all the VE interfaces of these member VLANs will flap during convergence, which is the expected behavior.
Additional notes
The generation of syslog messages to signify VE interfaces flapping wasn't implemented until Release 5.8; hence older versions of code may not see the syslog messages when the VE interfaces flap (NI-17656/DEFECT000528591).

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