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300-415 · Question #340

What problem happens on a device with two serial numbers, a unique device identifier (UDI), and a secure unique device identifier (SUDI) when an engineer provisions ISR 4000 by PnP using only a UDI?

The correct answer is D. It encounters redirection problems. When an ISR 4000 has both a UDI and a SUDI and PnP provisioning is configured using only the UDI, the device encounters redirection problems because the PnP server cannot correctly correlate and redirect the device during the claim process.

Router Deployment

Question

What problem happens on a device with two serial numbers, a unique device identifier (UDI), and a secure unique device identifier (SUDI) when an engineer provisions ISR 4000 by PnP using only a UDI?

Options

  • AIt faces interface buffer overflow problems.
  • BIt encounters memory overload problems.
  • CIt encounters spanning tree issues.
  • DIt encounters redirection problems.

How the community answered

(24 responses)
  • A
    4% (1)
  • B
    4% (1)
  • C
    17% (4)
  • D
    75% (18)

Why each option

When an ISR 4000 has both a UDI and a SUDI and PnP provisioning is configured using only the UDI, the device encounters redirection problems because the PnP server cannot correctly correlate and redirect the device during the claim process.

AIt faces interface buffer overflow problems.

Interface buffer overflow is a hardware-layer issue unrelated to PnP identity resolution or the dual-serial-number condition.

BIt encounters memory overload problems.

Memory overload is a resource-level problem unrelated to PnP provisioning logic or identifier mismatches.

CIt encounters spanning tree issues.

Spanning tree issues are Layer 2 loop-prevention concerns completely unrelated to the PnP zero-touch provisioning process.

DIt encounters redirection problems.Correct

Cisco PnP uses the device identifier to perform a redirect to the correct provisioning server. When two identifiers exist (UDI and SUDI) but only the UDI is registered, the PnP agent on the device may present the SUDI during the connection, causing the PnP server to fail to match the device and produce redirection failures. This mismatch disrupts the automated zero-touch provisioning workflow.

Concept tested: PnP provisioning with UDI vs. SUDI on ISR 4000

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/pnp/ios-xe-17/pnp-book-xe/m-pnp-overview.html

Topics

#PnP Provisioning#UDI/SUDI#Device Identification#Redirection Problems

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