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random high latency issues on ex2300 series switches

‎12-20-2018 11:49 AM

Wondering if anyone else is seeing this.

 

I randomly run into really high latency issues pinging/monitoring the management IP address of some of my ex2300 series switches. Latency of 2000+ms or just plain timeouts will happen. I will start getting alerts from my SNMP monitoring system. It doesn't seem to impact the devices plugged into the switches, just the management. Sometimes I won't be able to SSH into them it gets so bad. The logs never really show anything telling of the problem. 

 

Any ideas? 

6 REPLIES 6
Ethernet Switching

Re: random high latency issues on ex2300 series switches

[ Edited ]
‎12-20-2018 12:07 PM
I know the ex2300’s does not have a very powerful routing engine CPU and have seen when aggressively monitoring the device RE utilization gets high and icmp can be delayed.

I would see if your device has high utilization during these events and if so, what process is using these resources.

https://kb.juniper.net/InfoCenter/index?page=content&id=KB26261

(on mobile, please excuse any misspelling)
Ethernet Switching

Re: random high latency issues on ex2300 series switches

‎12-26-2018 04:00 AM

Thanks for the response, that is one thing I'm trying to keep an eye on.

Do you know of a way to get more of a continous update on resource useage, like TOP? 

Ethernet Switching

Re: random high latency issues on ex2300 series switches

‎12-26-2018 03:02 PM

The junos command from kb26261 listed above is essentially running top from inside junos.   This will help you identify what is using the cpu during incidents.

 

show system processes extensive

 

https://kb.juniper.net/InfoCenter/index?page=content&id=KB26261

 

Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home
Ethernet Switching

Re: random high latency issues on ex2300 series switches

‎12-27-2018 07:45 AM

Yeah, I was looking for something that isn't static, like how TOP continously updates those fields.

Maybe that isn't an option with this command. 

Ethernet Switching

Re: random high latency issues on ex2300 series switches

‎12-29-2018 08:48 AM

You can drop to the shell and run top directly too.

 

start shell

 

Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
http://puluka.com/home
Ethernet Switching

Re: random high latency issues on ex2300 series switches

‎07-19-2019 05:00 AM

Good Day, i am seeing this same issue still. Anyone know why this is happening. Previously these switches were completely inaccesable, only after i picked up on some IPV6 ICMP traffic on the network and blocked it the switches become accessible again, however i am still seeing from time to time this happeing. I am also concerend that it might be effecting passthought traffic aswell.