Virtual Circuit Overview and Technical Specifications

A virtual circuit (VC) is a logical connection between two endpoints. You can provision a virtual circuit and begin passing traffic within minutes, adjust the capacity to fit your needs, and update VLAN tags as necessary.

PacketFabric virtual circuits are Ethernet Virtual Private Lines (EVPL). We offer the following EVPL services:

  • Backbone virtual circuits - Connection between your equipment in two different locations.
  • Third-party virtual circuits - Use the marketplace to connect to another customer in the PacketFabric ecosystem.
  • Internet Exchange (IX) virtual circuits - Connect to an Internet Exchange provider.
  • Hosted and dedicated cloud connections - Connect to a cloud service provider (CSP) such as AWS, Google, or Azure.

For information about third-party and IX circuits, see Ecosystem Connections Overview.

For information about connecting to cloud service providers, see Cloud Connectivity.

Multi-point connections

Virtual circuits are multi-point to multi-point connections. This means that you can have multiple virtual circuits provisioned on a single access port.

Virtual circuits connecting

Note: How you manage virtual circuit capacity is entirely up to you. We do not restrict your ability to oversubscribe a port (for example, provisioning three 10 Gbps virtual circuits on a 10 Gbps port).

Technical notes and constraints

  • Header row

    • Feature
    • Description
  • Row 1

    • Vendor restrictions
    • None. Virtual circuits are vendor-agnostic.
  • Row 2

    • Virtual circuits per port
    • Up to 4,000.
  • Row 2

    • Burst size
    • 6250000 bytes
  • Row 2

    • Supported protocols
      • BFD
      • GARP/GMRP
      • Jumbo frames (up to 9092)
      • LACP (not tunneled)
      • MPLS unicast
  • Row 2

    • Unsupported protocols
      • ELMI
      • Link OAM
      • LLDP
      • MacSec
      • MPLS multicast
      • Multicast
      • Pause frames
      • PNAC 802.1X
      • Provider bridge group access
      • Q-in-Q
      • Spanning trees

Ethernet specifications

  • Header
    • Service
    • Service Features
  • Row
    • Ethernet Virtual Private Line (EVPL)
    • Ethernet and IP header support:
      Tag protocol IDs: 0x88a8, 0x8100, 0x9100
  • Row
    • Untagged support:
      Untagged port handoffs are available, the selection of an untagged port means this port is not eligible to be configured for tagged services.
  • Row
    • Tagged VLAN support:
      VLANs 4-4094 are available for handoff at each port
  • Row
    • Quality of Service marking:
      • Support preservation of IP precedence/DSCP bits: Yes
  • Row
    • MAC addresses per endpoint:
      1024
  • Row
    • Broadcast, Unknown Unicast, Multicast (BUM) traffic support:
      Service can consist of 10% BUM traffic
  • Row
    • Dedicated bandwidth available UNI-to-UNI:
      Yes
  • Row
    • Core/Backbone service resilience:
      EVPL service is protected with Node+Link Fast Reroute technology, ensuring sub-50ms service restoration.
  • Row
    • Local port resilience:
      EVPLs may be multihomed to multiple PacketFabric PE devices within the same facility using MC-LAG.