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Forum Replies

  1. For r1 why is untagged?
    Similar for r3 why is untagged?

  2. TDP is the old Cisco equivalent protocol for LDP. LDP is an IETF standard. On older IOS versions, TDP is the default. Nowadays LDP is the default. There is a command to change the protocol:

    R1(config)#mpls label protocol ?
      ldp  Use LDP (default)
      tdp  Use TDP

  3. Hi Zaman,

    Think of an MPLS VPN network where we have PE and CE routers. The PE routers only require an LSP (Label Switched Path) between their loopback interfaces and the /32 IP address that is configured on these loopback interfaces. These are the IP addresses that are used for the next hops in BGP.

    By default, LDP creates and advertises a label for each and every prefix that is learned. This increases memory usage but also the number of advertisements between peers. If you only advertise labels for the LSPs that you need, you reduce convergence time and memory usage.

  4. hi

    R3(config)#access-list 1 permit
    R3(config)#no mpls ldp advertise-labels
    R3(config)#mpls ldp advertise-labels for 1

    (mpls ldp advertise-labels for ) is a command ok but ( 1) what for i dont understand

  5. Hello Staut

    When speaking about MPLS, the term label and tag may be used interchangeably. The term label is the officially correct one, but keep in mind that in the context of MPLS, the term tag may be used as well.

    I hope this has been helpful!


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