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Bronze

difference between 802.1d stp and cst

hi every body!

I am just confused about the difference between 802.1d stp and cst. Are they same?

thanks a lot!

1 ACCEPTED SOLUTION

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Hall of Fame Super Blue

Re: difference between 802.1d stp and cst

Sarah

802.1d is the IEEE spanning-tree algorithm that prevents loops in a layer 2 network.

CST is an implmentation of 802.1d where there is only one instance of STP running for all the vlans in your layer 2 network no matter how many vlans that is.

PVST/PVST+ is an implementation of 802.1d where each vlan runs it's own instance of STP.

Jon

1 REPLY
Hall of Fame Super Blue

Re: difference between 802.1d stp and cst

Sarah

802.1d is the IEEE spanning-tree algorithm that prevents loops in a layer 2 network.

CST is an implmentation of 802.1d where there is only one instance of STP running for all the vlans in your layer 2 network no matter how many vlans that is.

PVST/PVST+ is an implementation of 802.1d where each vlan runs it's own instance of STP.

Jon

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