"Hey everyone, I am reviewing a performance upgrade for an ISR 4320 that we originally sourced through ORM Systems, and it has started to feel a bit limited during heavier traffic windows. Once we combine a few IPSec tunnels, routing processes and general WAN load, the router seems to peak earlier than expected. The FL-4320-PERF-K9 license is supposed to bump the performance tier, but real world results always matter more than the datasheet. Has anyone here activated this recently? Did you see any noticeable improvement"
"Once we combine a few IPSec tunnels, routing processes and general WAN load, the router seems to peak earlier than expected. The FL-4320-PERF-K9 license is supposed to bump the performance tier, but real world results always matter more than the datasheet. Has anyone here activated this recently? Did you see any noticeable improvement in throughput or responsiveness once the PERF tier was unlocked? Also, did the license apply cleanly or require a firmware jump before it took effect? Any firsthand experience would help me decide."
ISR 4320 performance can become constrained when multiple IPSec tunnels, routing processes, and general WAN load run concurrently. The FL-4320-PERF-K9 license raises the platform performance tier to allow higher forwarding rates. Activation often requires a compatible IOS-XE release, proper licensing registration, and sometimes a device reload for the new tier to take effect. Observable throughput and responsiveness improvements depend on traffic profile, whether crypto is hardware-accelerated, and which packet-processing features remain CPU-bound. Validation should use controlled throughput tests, CPU and platform counters, and real application flows to measure actual gains.
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