Cisco Catalyst PnP Problem

[ggomes63]

Hello everyone,

We recently had Cisco Catalyst center (Version 2.3.7.7-70047) installed in our infrastructure. I'm triyng to get started with the Plug and play functionality, with the simplest test. I have a out of the box Cisco 9200 (IOS-XE 17.12.1r), that I connect to a layer 2 swtich that modifies the pnp service vlan, to vlan 10, and this one connect to the layer 3 switch where int vlan 10 is defined together with the dhcp pool with the appropriated option 43.

Looking wo the console output after power on, i can see that the switch gets the ip and pnp server option correctly. The problem starts when trying to connnect to port 80 in the pnp server to get the initial certificate (I check, port80 is listening).

Acquired IPv4 address x.x.x.x on Interface Vlan10
Received following DHCPv4 options:
        domain-name     : domain.local
        vendor          : 5A1D;B1;K4;Ix.x.x.x;J80;
        dns-server-ip   : x.x.x.x
        secondary-dns-server-ip   : x.x.x.x

PnP HTTP timed out (1/10) on connection to PnP server (http://x.x.x.x:80/pnp/HELLO)
CCO server (devicehelper.cisco.com.) can't be resolved (1/5) by (pid=417, pname=PnP Agent Discovery, time=16:27:37 UTC Wed Mar 5 2025)
PnP Discovery trying to connect to PnP server (http://x.x.x.x:80/pnp/HELLO)
PnP HTTP timed out (2/10) on connection to PnP server (http://x.x.x.x:80/pnp/HELLO)

It eventually reaches 10/10 timeout and aborts. There aren't firewalls between server and device, connectivity tested, Catalyst center shows no problem with related services. I tried in the previous version of Catalyst center with the same outcome.

Thank you for your time.

Best regards

[Torbjørn · Accepted solution]

You should verify the following:

1. That the device actually gets an IP in VLAN 10
2. That DHCP sets a default gateway
3. Check that you can ping from the device (should be fine for PNP as long as you don't configure anything)
4. Check that you can telnet port 80 of the Cat-C from the device

If all of these are OK I think you might need to replace B1 with B2 in your option 43 value. B1 indicates that a hostname is to follow, while x.x.x.x looks like it would be an IP address.

[ggomes63]

Thank you @Torbjørn for the help. I saw going through your points that i was giving the wrong default gateway, missing by one digit...

[Torbjørn]

No problem! I've done mistakes like that a few more times than I'd like to admit...