Ring topology problems

[AlexandreOppermann]

When we set the ring on the 5 switches, according to the image below, there was looping on the network, dhcp did not work, vlans did not communicate, ie stopped the entire network for 1 hour.

The other switches were running spanning-tree pvst

I'll be pasting the attached configuration.

[Jaderson Pessoa]

Hello,

In according your topology you will has a loop if STP doesn't configured properly.

Could anwser some question?

Which version of stp is configured on your switch of distribution?
Who is the root bridge?

Could you provide output from:
show spanning-tree summary
show spanning-tree
show interfaces trunk

[AlexandreOppermann]

Which version of stp is configured on your switch of distribution? PVST
Who is the root bridge? cfw-4506-cpd

Could you provide output from:
show spanning-tree summary attached commands.
show spanning-tree attached commands.
show interfaces trunk attached commands.

[AlexandreOppermann]

show spanning-tree summary attached commands.
show spanning-tree attached commands.
show interfaces trunk attached commands.

[Jaderson Pessoa]

Hello,

About your stp version, you dont run it on pvlan, you are working through common STP version

Spanning tree enabled protocol ieee and all ports working on designated forwarding, any ports are backup ou blocked ports. Please check all stp version on all switches to this work properly.

My configuration tell me which version i'm using, like it:

Spanning tree enabled protocol rstp

Regards

[AlexandreOppermann]

All the switches are running the version pvst, 

cfw-4506-cpd#sh run | sec pvst
spanning-tree mode pvst

cfw-4506-caixadagua#sh run | sec pvst
spanning-tree mode pvst

cfw-3400-rack01-fibra#sh run | sec pvst
spanning-tree mode pvst

cfw-3400-uis#sh run | sec pvst
spanning-tree mode pvst

cfw-me3400-classificacao#sh run | sec pvst
spanning-tree mode rapid-pvst

[AlexandreOppermann]

but in this version that we have "PVST" will not work? Do we have to change version?

[Deepak Kumar]

Hi,

As per your topology and Show commands output. It is looking an L2 loop is the cause of downtime. Your all ports on the FWD mode. Check your STP configuration. Did you make any changes before the downtime?

Regards,

Deepak Kumar

[Jaderson Pessoa]

I cant see your stp topology because there aren't any attachments.

Regards,

[AlexandreOppermann]

What do you need ? 

[Jaderson Pessoa]

Dear Alexandre,

in according your topology, there are many switches, so, many bpdu packets run through in your topology.

You are using a PVST, calculating the time between all switches, this will past many times to converged all switches on stp topology. I suggest you to change it from PVSTP+to RSTP or MST.

For PVST+ usually between 30-50 seconds unless you enable enhancements. RPVST+ from almost instant to 6 seconds. MST is the same as RPVST+ because MST uses RSTP as well.
Read this document:
http://blog.ine.com/2009/03/07/understanding-stp-convergence-part-i/

[AlexandreOppermann]

Okay, but will this solve my problem?

[Jaderson Pessoa]

Of course, your topology will have a faster convergence in the case of a need for new configurations or changes.

Best regards,

Do not forget, please check how resolved and helpful all the posts that have helped you.

[paul driver]

Helo

Not matter what stp mode you have applied you shouldn't by default have created a stp loop between these 5 switches so unless you haven't negated what ever it is that is causing the loop then i guess it wont resolve it.

I can see the bottom 3 switchs are interconnected downstream by other devices , What are these?, is it possible these are looping back into your network?

Best practice would be to apply stp portfast/ bpduguard on all edge access ports and ONLY have end hosts attached to them also but portfast from any trunks along with any stp bpdufiltering (access or tunk ports)

[AlexandreOppermann]

Can you mark the 3 switches in the drawing for which you want information?

Could you explain better what the commands are and where should I apply them?
Which commands should I apply?

The configuration we have today on all machine ports, phones etc. we apply the spanning-tree portfast commands, uplinks we have no spanning-tree command applied.