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Forum Replies

  1. Hi Rene, Andrew
    I am afraid I still don’t understand one thing- why do we need vpn label if we have both RD and RT’s ?
    It was said the router wouldn’t know what VRF the route belongs to… well:
    When PE1 advertises the route to PE2 , this route is unique for BGP because of RD and PE2 also knows in what VRF to install it thanks to Route Target value.
    So the MPLS VPN label seems to be redundant as the BGP can figure the VRF out based solely on the Route Targets …
    What am I missing in this puzzle :slight_smile: Thank you
    Edit- ok, I think I mix up the control and data plane again

    ... Continue reading in our forum

  2. Hi @kumaracp10,

    Many thanks for your excellent question. If you are referring to MPLS labels, this is primarily used as a method to quickly switch IP packets within the MPLS core. This is the most basic feature of MPLS so it is used in all MPLS networks even if there is no VPN overlay. The 1st MPLS tag exists only to enable MPLS forwarding plane operations.

    **If we decide to operate a VPN over MPLS, a second MPLS tag is added** to allow PEs to know how to efficiently forward incoming packets.

    In MPLS there are two basic rules that help us unpick the architec

    ... Continue reading in our forum

  3. Simple, thorough and to the point. Wonderful. Been looking for this. Thanks Rene. Tom

  4. Hello Fabrice

    The specific benefits as described by Cisco are the following:

    Benefits
    The MPLS VPN ID feature provides the following benefits:

    • Remote access applications, such as the Remote Authentication Dial-In User Service (RADIUS) and Dynamic Host Configuration Protocol (DHCP), can use the MPLS VPN ID feature to identify a VPN. RADIUS can use the VPN ID to assign dial-in users to the proper VPN, based on each user’s authentication information.

    • A VPN is private and uses a private address space that might also be used by another VPN or by the Internet. T

    ... Continue reading in our forum

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