SNMP Polling Nexus 5596 slow

[Tore Nilsen]

Hi,

I'm polling the ifTable  from a Nexus 5596 (with 4 FEX's connected) . It takes between 10-20 seconds (compared to 100 ms on a catalyst switch)

Running version 5.2(1)

Any idea how to improve this ?

Regards, Tore

[Thomas Zenz]

Same problem here on a 5696 running 7.3(3)N1(1)

Any Ideas?

[Georg Pauwen]

Hello,

what are you using for SNMP polling (e.g. SolarWinds, PRTG) ?

[Thomas Zenz]

I am running snmpwalk on a RedHat CLI.

[Georg Pauwen]

Hello,

check the control plane policy. Most likely you are running the default CoPP. In the default policy, SNMP is policed in the below class:

class copp-system-class-mgmt
police cir 12000 kbps bc 4800000 bytes

Check if you see drops in that class with the 'show policy-map interface control-plane' command. If there are drops, your only option is to use and modify the 'copp-system-policy-customized', and increase the cir for the copp-system-class-mgmt class...

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/security/513_n1_1/b_Cisco_n5k_security_config_gd_513_n1_1/b_Cisco_n5k_security_config_gd_513_n1_1_chapter_01101.html#d41033e1139a1635

[Thomas Zenz]

Looks like there are no drops:

#show policy-map interface control-plane class copp-system-class-mgmt
Control Plane

service-policy input: copp-system-policy-default

class-map copp-system-class-mgmt (match-any)
match protocol mgmt
police cir 12000 kbps , bc 4800000 bytes
conformed 0 bytes; action: transmit
violated 0 bytes;

I also checked the other classes, no violations:

#show policy-map interface control-plane | i violated
violated 0 bytes;
violated 0 bytes;
violated 0 bytes;
...

violated 0 bytes;