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Forum Replies

  1. Hi Heng,

    You can configure a different priority for each VLAN, allowing you to select a different root bridge per VLAN.

  2. Hi Zeko,

    You change it with the following command:

    SW1(config)#spanning-tree vlan 1 priority 4096

    Which sets the priority to 4096 for VLAN 1. This way, you can change it for each individual VLAN. You can also do this for a range:

    SW1(config)#spanning-tree vlan 1-200 priority 4096

    There’s also this command:

    SW1(config)#spanning-tree vlan 1 root primary

    You can use “primary” or “secondary”. Basically it’s a macro that checks for the current root bridge and then sets the priority of the switch to a value just above or below the current root bridge.

    By default, the

    ... Continue reading in our forum

  3. Hello Aniket

    PVST+ is the default configuration on most modern Cisco switches. If you have changed this default and you want to revert back to PVST+ you can do this by issuing the following command: spanning-tree mode pvst.

    Now the fact that the ‘+’ is not included can be a bit confusing. Keep in mind that plain PVST is no longer configurable on a switch, it’s always PVST+ so even if you see ‘pvst’ alone in the command, it is always PVST+ that is being referred to.

    The advantage of PVST+ is that it sends 802.1D compatible BPDUs, as well as Cisco proprietary,

    ... Continue reading in our forum

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