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VIP Advisor

Re: Packet loss across Catalyst

Hello

That switch is quite old! - Have you checked the health of it?
Would you be able to post the output of the following into a file?

sh process cpu sorted/history
sh memory summary
sh int x/x controllers
show interface | include line|\/sec
show ip interface | in switch

sh version | in Ba
sh spanning-tree root
sh spanning-tree summary
show spanning-tree detail | in ieee|root|top|link|bpdu

 

res
Paul



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
Highlighted
Beginner

Re: Packet loss across Catalyst

Hey Paul,

 

Yeah, it wasn't looking too bad, please find attached.

 

Ben

 

 

VIP Advisor

Re: Packet loss across Catalyst

Hello Ben

Thanks for the output 

im traveling at present so kind of hard to read that output - however may I suggest a few tweaks?

 

on the L3 core 

1) my sure that switch is the stp root for all vlans (even vlan 1)

 

2) enable stp loop-guard uplinkfast globally on all switches  And stp  portfast-bpduguard on all access ports

3) enable fast switching on the l3 interfaces  ( ip route-cache)

res

Paul

 

 



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
VIP Expert

Re: Packet loss across Catalyst

The 3560/3750 series of switches are a bit infamous on having little RAM to buffer interface bursts, and the series buffer management, by "reserving" buffers for ports, often makes the lack of buffer RAM acute, especially with QoS enabled.

Assuming your interface buffer needs are transient, and most interfaces aren't "busy" concurrently, you can "tune" buffer management from a reserved model to a dynamically acquire resource model, which I've found, will often dramatically reduce interface output drops.
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