Problem with muticast in switch

[SebastianCampos7906]

Hi i have a switch cisco and i have a problem, let me explain. I have multiples servers(hosts) connected to the cisco that deliver a stream service so far so good but when i connect physically a new cable or when i make noise in the switch (up/down servers, reboot servers, disconnect a cable, etc) loose connectivity channels of a ramdom server o loose connectivity a entire server like for 1 minute or less and then comeback. I debug IGMPS but not say nothing, can you help me pls.

[Joseph W. Doherty]

Do you have an STP variant running? If so, are you using portfast on edge ports?

[SebastianCampos7906]

Hi, yes i have a stp and i using portfast

[chrihussey]

This sounds more like a STP issue more than anything else. Could you post the switch config and perhaps "sh spanning-tree root"?

[SebastianCampos7906]

of course, i attached a txt with the running-config.

Root Hello Max Fwd
Vlan Root ID Cost Time Age Dly Root Port
---------------- -------------------- --------- ----- --- --- ------------
VLAN0001 32769 acf5.e620.9d00 0 2 20 15

The sh.

[chrihussey]

Hello,

Not sure the reasoning behind the way you have things configured, but you have spanning tree turned off on all the interfaces with the "spanning-tree bpdufilter enable" command and from what I can tell the "no ip igmp snooping tcn flood" allows flooding of all multicast packets anytime there's a topology change (for example a port going up and down). So every time you reboot a server or add a new connection, causing a port to go up or down, you're flooding all the ports with multicast traffic and basically creating a broadcast storm. Not to mention any broadcasts that probably compound the issue.

Unless there is a compelling reason, suggest removing the "no ip igmp snooping tcn flood" to see if that improves things, and then the "spanning-tree bpdufilter enable" if possible. Also, if this switch is connected to other network switches, removal of the bpdufilter may require a closer look.

Hope this helps.

Hope this helps.

[SebastianCampos7906]

if i activate that i have to disabled the portfast of the interface?, let me explain

interface GigabitEthernet0/1
speed 100
spanning-tree portfast edge
spanning-tree bpdufilter enable

like this?, i have to disabled bpdu?

[chrihussey]

"spanning-tree bpdufilter enable" disables spanning tree bpdus on an interface. Essentially disabling STP. Which could be an issue if connected to other switches.

"spanning-tree portfast edge" allows for the immediate forwarding of packets until STP can run, mainly for purposes of DHCP and access ports.

I don't understand your response though. However, if you have portfast on an interface and are concerned about possible BPDUs, then you enable BPDU guard either globally or on an interface basis.

[SebastianCampos7906]

I do that you say, and it's work like for 8 hrs but the server have again fall and i don't know what can be the problem. I attached a txt with a log, like de 19:20 to 19:25 the servers loose the connection. I hope you can help me.

[balaji.bandi]

Can you show us high level network diagram, and post the configuraion along with show spanning root and block