Cisco C1-CISCO4331/K9 Cisco ONE ISR 4331 Branch Router

C1-CISCO4331/K9 Order-Line Facts

C1-CISCO4331/K9 identifies a Cisco ONE ISR 4331 configuration. Cisco's lifecycle table records three GE ports, two NIM slots, one service-module slot, 4 GB flash, 4 GB DRAM and IP Base. Those values distinguish it from the larger C1-CISCO4431/K9 and should be checked against the physical inventory.

4331 branch sizing

Cisco's ISR 4000 family table lists 100 Mbps default aggregate throughput and 300 Mbps with the performance license for ISR 4331. Boost behavior is separately licensed and measured under Cisco's stated conditions. Size from observed application traffic, encryption, inspection and service concurrency, not from an unverified maximum copied from another ISR 4000 model.

Slot-specific bill of materials

Capture both NIM slots, the service-module slot, installed interfaces and any PoE or power option in the asset record. Validate module support against the intended IOS XE release. A design requiring three NIM slots or the 4431's different expansion profile cannot be satisfied by changing a software license on this chassis.

Cisco ONE retirement evidence

The exact C1-CISCO4331/K9 order line reached end of sale on October 28, 2022; Cisco lists October 31, 2027 as the last date of support for the affected Cisco ONE hardware PIDs and identifies ISR4331/K9 as the replacement PID. Treat availability as legacy or refurbished procurement with explicit entitlement and lifecycle review.

Operational continuity check

Before reuse, verify serial ownership, current IOS XE, security-support position, configuration backup, interface modules, performance rights and service coverage. For replacement planning, document WAN circuits, routing adjacencies, VPN and security dependencies, voice services and recovery objectives so the target edge platform is selected from actual requirements.

Cisco evidence: Cisco exact C1-CISCO4331/K9 lifecycle table, Cisco ISR 4331 specifications and Cisco ISR 4331 support page.