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The most common MPLS connectivity services include: Virtual Private LAN Service (VPLS) Layer 3 virtual private networks (VPNs) Layer 2 circuits and Layer 2 VPNs Layer 2 circuits and Layer 2 VPNs are point-to-point Layer 2 services built over the service provider’s MPLS transport
In this article, we will test and demonstrate L2 virtual circuits scale on Express4-based PTX routers
Question Can a Layer 2 circuit be terminated into VPLS?...For more information, click Layer 2 VPNs and VPLS Feature Guide
Question What are the supported Layer 2 interworking stitching configurations? Answer These are the stitching options supported in Junos OS Release 9.3 and later: Layer 2 circuit into Layer 2 VPN NOTE: In Junos OS Release 9.4 and later, you can use an iw interface instead of an lt interface for this purpose. Layer 2 circuit into Layer 2 circuit Layer 2 VPN into Layer 2 VPN For more information, click Layer 2 VPNs and VPLS Feature Guide
Question What is the solution for interprovider Option B connection between LDP-based Layer 2 circuits and BGP-based Layer 2 VPNs? Answer As of Junos OS Release 9.3 and later, Layer 2 circuits with interworking iw0 interfaces can be manually stitched. If dynamic signaling is needed, use FEC 129 multisegment pseudowires if you are not using BGP-based Layer 2 VPNs. In Junos OS Release 11.2 and later, FEC 129 is supported. For more information, click Layer 2 VPNs and VPLS Feature Guide
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Question How many Layer 2 circuits can be terminated into a single VRF instance? Answer On an MX Series router, 48 Layer 2 circuits can be terminated into a single VRF, per each tunnel PIC