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dropped packet using sfp fibre lag between x2 sets of stacked GS728TS / GS752TS switches
Hi There,
Running into a slight issue with the LAG setup to join x2 office floors together onto the company lan. I have the following configuration presently:
Ground Floor:
x2 GS752TS
x2 GS728TS
All stacked using netgear stacking modules in the SFP ports (g1/51,g1/52,g2/51,g2/52,g3/27,g3/28, g4/27,g4/28.
STP is enabled.
Fibre modules installed in SFP ports g1/49,g2/49 using the netgear AGM731F module
7th Floor
x3 GS728TS
All stacked using netgear stacking modules in the SFP ports (g1/27,g1/28,g2/27,g2/28,g3/27,g3/28)
STP is enabled
Fibre modules installed in SFP ports g1/25,g3/25 using the netgear AGM731F module
With only one fibre link connected the link never drops a single ping request irrespective of which fibre link is connected. When both are connected there is a periodic ping loss, about 8% within a 2 minute continuous ping test.
I'm unsure as to where to go next in terms of troubleshooting this so any help would be most appreciated.
Chris.
cjn_bjss,
I believe it doesn't detect any loops within those switches that is why it is showing disabled. You may try connecting a cable from g1-g2 on the same switch just to check if STP will work. Even if you enabled LAG and the configuration from the other switch is incorrect, definitely, it will not show anything in the stats page. Make sure that both ends have the same configuration in setting up LAG and even in Stack configuration.
Regards,
5 Replies
Hi cjn_bjss,
Welcome to our community!
As per checking in here that if you have 2 connections going to the other switch, it would cause some periodic ping loss or drops. May I know if the ports are set to Stack or Ethernet? Does the switch running on latest firmware version?
Regards,
Hi John,
Thanks for getting back to me, and apologies for not responding sooner utterly swamped at the mo.
Anyhow, I've logged back onto the switches and got the following info:
Switches are all running version 5.3.0.25
Stacking port configuration: only ports g27-g28 on each switch have the option to be configured as Stack or Ethernet. They're all configured as stack to link the three switches on the floor into a stack. The Fibre SFP connections are using 1/g25 & 3/g25
One thing I have noticed is on the switching / STP window it's displayed as enabled. However, on the Port Detailed Stats page it's showing the STP Mode as 'Disable' and the STP State as 'Disabled'. In the LAG Configuration the LAG STP Mode is set as Enabled.
Is this likely to have an impact on the trunk as although I've enabled it on the switch / LAG it doesn't show as enabled on the stats page?
cjn_bjss,
I believe it doesn't detect any loops within those switches that is why it is showing disabled. You may try connecting a cable from g1-g2 on the same switch just to check if STP will work. Even if you enabled LAG and the configuration from the other switch is incorrect, definitely, it will not show anything in the stats page. Make sure that both ends have the same configuration in setting up LAG and even in Stack configuration.
Regards,
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