PNP Server Quiestion

[mchavez2375]

Hello all, sorry for the total newbie question but are the following messages anything to be concerned with? There are two switches on the stack. 1. CBS350-48T-4X, 2. CBS350-48P-4X. Thanks so much in advance!

Stack3Master#18-Dec-2022 16:39:38 %PNPAGENT-I-PNPSRVRDETECT: PnP Server devicehelper.cisco.com was detected
18-Dec-2022 16:39:40 %PNPAGENT-I-BACKOFFCALLBACKAFTER: Backoff PnP Request with <callbackAfter> has received: 0 Hours 10 Minutes 0 Seconds
18-Dec-2022 16:39:40 %PNPAGENT-I-RESPSUCCESS: PnP Response Success
18-Dec-2022 16:39:42 %PNPAGENT-I-BYEREQ: Bye PnP Request

Here are the pnp settings of the switch...

Stack3Master#show pnp
Administrative status: enabled
Operational status: ready
PnP Agent state: sessionWait
Transport protocol: https (default)
Next session: http (default)
Server IP address: devicehelper.cisco.com (default)
Next session: pnpserver (default)
TCP port: 443 (default)
Next session: 80 (default)
Username: (default)
(Encrypted)Password: (default)
Discovery Timeout: 60 seconds (default)
Discovery Exponential Factor: 3 (default)
Discovery Maximum Timeout: 540 seconds (default)
PnP Session Interval Timeout: 30 seconds (default)
PnP Watchdog Timeout: 60 seconds (default)
Timer Remainder: 596 seconds

[Martin Aleksandrov · Accepted solution]

Hi there,

There is nothing worrisome or anything to be concerned with.

These messages simply say you have the PnP feature on your switch enabled and the PnP server (Cisco Business Dashboard) is not discovered on any of the first three of the following methods:

1. User-configured address- the PnP server URL or IP address is specified by the user.
2. Address received from DHCP response option 43- the PnP server URL or IP address are received as part
of option 43 in the DHCP response
3. DNS resolution of host name "pnpserver"- the PnP server IP addressed is obtained via DNS server
resolution of hostname “pnpserver”.
4. Cisco Plug and Play Connect - a redirection service that allows full “out of the box” PN Pserver discovery
which runs over HTTPS. 

Therefore, if any of the first three methods fail then the switch automatically tries the 4th one with the Cisco Plug and Play Connect. Then the switch contacts the redirection service using the FQDN “devicehelper.cisco.com”. which is what you see in the logs. If you disable the PnP these messages will disappear. 

More information you can find in the CBS350 adimnistration guide:

https://www.cisco.com/c/en/us/td/docs/switches/lan/csbms/CBS_250_350/Administration-Guide/cbs-350.pdf

[mchavez2375]

Hi Martin, it makes total sense! Thanks so much for the speedy reply!

Miguel