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Forum Replies

  1. Hi Rene,
    In blocking port state,switch not able to receive and transmit any BPDUs,then How blocking port state move to listening state.

    --Ravi

  2. Mohammad,
    The concept of an Alternate port was introduced with Rapid Spanning Tree. This feature takes over what the traditional (802.1 D) spanning-tree enhancement of “uplink-fast” used to do. The Alternate port serves as a “hot-standby” for a switch’s Root Port, but Alternate Port is considered to be in a Discarding state (Discarding is the RSTP term for Blocking, Listening, and Disabled for spanning-tree).

    This means that an Alternate port can receive BPDUs but will not send them. As soon as a Root Port fails, the Alternate Port will immediately transitio

    ... Continue reading in our forum

  3. Hello Rene

    In your post you mentioned ports in block mode take the 20+15+15 before forwarding in some cases. Could you tell me in which case cause i was trying to simulate but i only got lis->lear->for states and not Max age time.

    Thanks in advance.
    Jose

  4. Hello Jose

    There are two situations which require a switch to begin STP convergence procedures. The direct and indirect link failures. Let’s take a look at both:

    1. A direct link failure is when a switch detects a loss of carrier on its own port and immediately declares the port as disconnected. Take a look at the following figure:

    https://cdn-forum.networklessons.com/uploads/default/original/1X/5fbad5eff789bd3c983bc63c61940dee3a6ffbe2.png

    The STP is converged and Port B is in blocking state. Imagine Port A goes down. The bridge no longer detects a carrier

    ... Continue reading in our forum

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