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Community Member

RSTP port types

Hi all, when we talk about rstp, we have 2 types of port edge and point to point, what is the difference between these ?

4 REPLIES
Hall of Fame Super Silver

Re: RSTP port types

Hello Carl,

a point-to-point port is a port where another switch is expected (STP partner here)

an edge port = access port where an end user device is expected (no STP partner here)

It is very important to classify edge ports in order to help RSTP to achieve the fastest convergence.

Hope to help

Giuseppe

Community Member

Re: RSTP port types

Hi there

So what is the difference between these ports? any spanning tree settings etc, as both ports listen and send bpdu's?

Hall of Fame Super Silver

Re: RSTP port types

Hello Carl,

no BPDUs are expected on edge ports : PCs don't send them

so the portfast settings and concept can be used on edge ports.

point-to-point ports: here STP BPDUs are expected and the handshake mechanism of RSTP can used to negotiate port role and state with the neighbor

Hope to help

Giuseppe

Community Member

Re: RSTP port types

Hi,

In addition to above post check this link for more understanding

http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_13_ea1/configuration/guide/swmstp.html#wp1008347

Hope this will help.

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