Configuring An Ethernet Switch As The Ce Device For Vpls - Juniper EX9200 Features Manual

VPLS Feature Guide for EX9200 Switches

Configuring an Ethernet Switch as the CE Device for VPLS

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For VPLS configurations, the CE device does not necessarily need to be a router. You can
link the PE routers directly to Ethernet switches. However, there are a few configuration
issues to be aware of:
When you configure VPLS routing instances and establish two or more connections
between a CE Ethernet switch and a PE router, you must enable the Spanning Tree
Protocol (STP) on the switch to prevent loops.
The Junos OS allows standard Bridge Protocol Data Unit (BPDU) frames to pass
through emulated Layer 2 connections, such as those configured with Layer 2 VPNs,
Layer 2 circuits, and VPLS instances. However, CE Ethernet switches that generate
proprietary BPDU frames might not be able to run STP across Juniper Networks routing
platforms configured for these emulated Layer 2 connections.
NOTE: In the VPLS documentation, the word router in terms such as PE router
is used to refer to any device that provides routing functions.
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