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Forum Replies

  1. Hello Ray

    Depending on the platform, the default state of bridge assurance may differ. On the 6500 series for example, bridge assurance is enabled globally by default and is enabled only on spanning tree network ports that are point to point links. On Nexus switches, it is enabled globally but disabled on individual ports and must be manually enabled.

    The feature is specifically used to protect against a unidirectional link failure or other software failure and against a device that may continue to forward data traffic when it is no longer running the spannin

    ... Continue reading in our forum

  2. Hello Rene,

    whats the difference between loopguard and bridge assurance?

    Thanks a lot.

  3. Hello Lukas

    In its operation, STP relies on a continuous reception and transmission of BPDUs to determine the port role. Typically, a designated port transmits BPDUs and a non-designated port receives BPDUs.

    Now when one of the ports in a redundant topology no longer receives BPDUs, STP believes that the topology is loop free. A blocked port in such a situation would become a designated port and move into ta forwarding state and this creates a loop. Now a topology is especially vulnerable to this when there is a unidirectional failure, that is, that traffic

    ... Continue reading in our forum

  4. Hello Ignacio

    Such a situation would occur if a fibre optic port is initially connected with only one of the two fibres resulting in unidirectional link from the moment the link goes up. Loopguard will not “kick in” unless both fibres were initially connected and then one of them subsequently failed.

    ... Continue reading in our forum

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