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Forum Replies

  1. Hello Rene,

    If I understand Rapid-PVST+ correctly, with rapid-pvst+ configured, it syncs with its neighbors by sending BPDU every hello time interval as a keep alive. Does Bridge assurance play a role with rapid-pvst+? Or by natural it’s not supported in rapid-pvst+ as it’s not needed?

    Thanks!!

  2. 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

  3. Hello Rene,

    whats the difference between loopguard and bridge assurance?

    Thanks a lot.

  4. 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

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