Spanning-Tree

Answered Question
May 5th, 2008

having difficulties comprehending pieces of stp. can someone expand a bit on CST vs. 802.1d From my understanding 802.1d utilizes 1-to-1 of STP instance per VLAN where CST has one instance for all VLAN's.


Any further info would be appreciated.


thankyou

Correct Answer by Jon Marshall about 8 years 10 months ago

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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mahmoodmkl Mon, 05/05/2008 - 06:59

Hi


CST is common spanning-tree is a dot1q standard which maintain a single instance of STP for all the vlans.


802.1d is a ieee standard of STP.


Thanks

Mahmood



Correct Answer
Jon Marshall Mon, 05/05/2008 - 07:22

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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