Latency on gateway

[mulbreizh]

Hello and sorry for my english,

I have all switch connect to Cisco 3850. I have also physicals servers and Wmware.

When i ping from servers, physical or not the gateway who is on C3850, the latency is very high, it can be 1ms and next 50ms, next 100ms, next 1ms. So it is very high.

But when i ping from one server connect to Cisco 3850 to an other server behind the 3850, the ping is very good, always 1ms.

What could be the explaination ? why the ping to the 3850 is very high ?

thanks

[M02@rt37]

Hello @mulbreizh 

Do you check spanning-tree ? There may be issues with the switch configuration, such as spanning tree recalculations or other processes affecting the switch’s performance.

[mulbreizh]

no, i am not expert on spanning-tree, what i can test ?

[MHM Cisco World]

#show processes cpu sorted 1min | ex 0.00 <<- this can answer, it can the SW face high CPU utilize and hence the ping is not process as fast we need 

MHM

[mulbreizh]

no that, the CPU is not high, 20%

[MHM Cisco World]

Ok' try use traceroute 

See how many hops between server and SW SVI

MHM

[mulbreizh]

just one hop

[MHM Cisco World]

show mac address table 
check the VLAN SVI 
then 
show mac address table <mac of SVI> <<<- do this in all SW from SW 3850 to server 

see if the Mac appear in two port or more 
MHM

[MHM Cisco World]

show processes cpu history <<- share this also
MHM

[mulbreizh]

an other informations, when i am directly connect to the Cisco 3850 with cable and ping C3850, i have similar problem, latency high, sometimes 1ms, sometimes 50ms

[MHM Cisco World]

check cpu friend again and check cpu history 

MHM

[mulbreizh]

CPU : 

last 60 secondes : 20% max
last 60 mintes : 30% max
last 72 hours : 30% average, sometimes 60%

[mulbreizh]

and an other information, it is two 3850 stack with stackwise

[mulbreizh]

UP

[MHM Cisco World]

I will update you tonight I think it is Bug 
but let see what I get 
thanks 

MHM