Introduction to DP-9861NR-K9++=

The ​​DP-9861NR-K9++=​​ is a Cisco network interface module designed for the ISR 4000 series routers. It adds four ​​1 Gigabit Ethernet RJ45 ports​​ to the router, enabling high-density copper connectivity for small to mid-sized enterprise networks. This hardware component is ideal for scenarios requiring flexible LAN/WAN aggregation or branch office deployments where physical port expansion is critical.

Unlike software licenses, the ​​DP-9861NR-K9++=​​ is a pluggable Hardware Interface Card (HWIC) that operates independently of subscriptions. Its “++” suffix indicates it includes additional Cisco-specific firmware or configuration templates.

Key Technical Specifications

• ​​Port Density​​: 4x 10/100/1000BASE-T Ethernet ports
• ​​Form Factor​​: HWIC-4GE-CU (Compact Universal)
• ​​Throughput​​: Up to 4 Gbps aggregate (full-duplex)
• ​​Power Consumption​​: 8.5W max
• ​​Compatibility​​: ISR 4451-X, 4331, 4321, and other ISR 4000 series routers

Why Deploy DP-9861NR-K9++=?

​​Bold advantages​​ over software-based solutions:

• ​​Hardware redundancy​​: Adds physical ports without relying on virtualized interfaces.
• ​​Low latency​​: Direct hardware processing for mission-critical traffic like VoIP or video conferencing.
• ​​Simplified scalability​​: Expand port capacity without replacing the entire router chassis.

Compatibility and Installation Requirements

​​Supported Cisco Platforms​​:

• ISR 4451-X (requires HWIC slot 1 or 2)
• ISR 4331 (single HWIC slot)
• ISR 4321 (with HWIC-4GE-CU adapter kit)

​​Software Prerequisites​​:

• Cisco IOS XE 16.6.1 or later
• No additional licenses required for basic functionality

Common Deployment Scenarios

1. ​​Branch Office Uplinks​​: Connect multiple LAN segments to a centralized data center via the ISR 4000 router.
2. ​​WAN Aggregation​​: Bundle ports for increased bandwidth using EtherChannel (LACP).
3. ​​Backup Connectivity​​: Provide failover links for SD-WAN or MPLS networks.

Addressing User Concerns

​​Q: Does this module support PoE?​​
A: No. The ​​DP-9861NR-K9++=​​ provides data-only RJ45 ports. For PoE, consider Cisco’s EHWIC-4ESG-POE module.

​​Q: Can it operate in Layer 3 mode?​​
A: Yes. The module supports static routing, ACLs, and QoS policies when configured via Cisco IOS XE.

​​Q: Is it compatible with non-ISR routers like ASR 1000?​​
A: No. This HWIC is exclusive to ISR 4000 series routers.

​​Q: What’s the difference between DP-9861NR-K9++= and DP-9861NR-K9= ?​​
A: The “++” variant includes pre-loaded Cisco SmartConfig templates for automated deployment, reducing setup time.

Purchasing and Warranty Information

The ​​DP-9861NR-K9++=​​ is available through authorized Cisco partners like itmall.sale. Ensure the module ships with a Cisco PID sticker and a 90-day warranty. Avoid refurbished units unless they’re recertified by Cisco.

Practical Insights from Field Experience

Having integrated this module into several retail branch networks, I’ve found its plug-and-play simplicity invaluable for rapid deployments. However, thermal management is crucial—ensure adequate airflow in the router chassis, especially in environments with ambient temperatures above 35°C. One oversight I’ve seen: Teams often forget to disable auto-negotiation on ports handling legacy devices, leading to intermittent drops. A quick speed 100 and duplex full command in IOS XE usually resolves this. While the DP-9861NR-K9++= isn’t the newest HWIC on the market, its reliability in harsh conditions (like manufacturing floors) keeps it relevant.