Articles tagged with stp

  1. Disable Spanning-Tree Per VLAN

    Posted on in Networking

    If you need to disable spanning-tree on a particular VLAN in your Cisco-based network, use the following command:

    Switch(config)# no spanning-tree vlan 13
    

    This will disable spanning-tree on unlucky VLAN 13.

    If you have some good examples of why you might want to disable spanning-tree for a VLAN, please …

  2. Max Spanning Tree (STP) Diameter

    Posted on in networking

    You may already know that the IEEE 802.1D specification recommends a maximum network diameter of 7 hops. What you may not know is that the number 7 is derived from a series of calculations based on various timers being tuned to their default values. If you are designing a …

  3. Err-Disabled: Loopback Edition!

    Posted on in Networking

    If you've spent any amount of time in Cisco networking with Catalyst switches, you've probably run across a port that is in err-disabled state. The most likely place to find this is in the output of show interfaces status. A switch port can end be error disabled if the software …

  4. 3 Reasons You Should Be Using Rapid Spanning Tree (802.1w)

    Posted on in Networking

    Most network administrators should be familiar with Spanning Tree Protocol (STP; IEEE 802.1D). <acronym title="Spanning Tree Protocol">STP</acronym> is tasked with ensuring there are no loops in a bridged network. Unfortunately, STP is an older protocol and doesn't quite mesh with today's high speed networks. Here are …

  5. UDLD In Radio-Based Metro Ethernet Rings

    Posted on in Networking

    <acronym title="UniDirectional Link Detection">UDLD</acronym> is a Cisco protocol designed to detect and disable unidirectional links in Ethernet (fiber or twisted-pair). In the case of a radio-based Metro Ethernet ring, UDLD goes the extra mile in preventing Spanning-Tree loops and user service interruption.

    4 Switches and Spanning-TreeIn this simple network of …

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