Upgrade Path for Junos OS Release 21.2R3
SUMMARY Read this topic to determine the upgrade path for Junos OS releases for your Juniper Networks SRX Series Firewall, vSRX Virtual Firewall Virtual Firewall, and cSRX Container Firewall Container Firewall.
Knowing the upgrade path helps you choose the correct Junos OS package or packages to install.
Table 1 shows the Junos OS release to which you can consider updgrading your SRX Series Firewalls and vSRX Virtual Firewall and cSRX Container Firewall instances.
| Devices | Junos OS Release |
|---|---|
| SRX300, SRX320, SRX340, SRX345, SRX380, SRX550M, SRX1500, SRX4100, SRX4200, SRX4600, SRX5400, SRX5600, SRX5800 | 21.2R3 |
| vSRX Virtual Firewall and cSRX Container Firewall | 21.2R3 |
The details provided in the table are as per the recommendations at the time of publishing this document.
The best practice is to always check the most up-to-date version as suggested in the following Knowledge Base articles.
- Junos Software Versions - Suggested Releases to Consider and Evaluate
- Junos Upgrade Paths for SRX Platforms
Upgrade Path for Your SRX Series Firewalls
Read the following sections to determine the upgrade paths for the latest recommended versions of Junos OS releases.
Direct Upgrade
We support direct upgrade for selected Junos OS releases. Table 2 lists the direct upgrade paths supported for SRX Series Firewalls.
| Current Junos OS Release | Direct Upgrade Releases |
|---|---|
|
15.1X49 |
19.4R3 Service release |
|
18.4R3 or 18.4R3 Service release |
19.4R3 or 19.4R3 Service release |
|
19.4R3 |
20.4R3 |
|
20.4R3 |
21.2R3 |
Interim Upgrade Path for Junos OS Releases 19.4R3 and 21.2R3
Use Table 3 and Table 4 to determine the upgrade path you must follow when upgrading to a newer version of Junos OS Release.
| Junos OS Release | Target Junos OS (First Hop) | Target Junos OS (Second Hop) | Target Junos OS (19.4R3) |
|---|---|---|---|
| 15.1X49 | 19.4R3-S1 | — | — |
| 17.3 | 18.2 | 19.1 | 19.4R3 |
| 17.4 | 18.3 | 19.2 | 19.4R3 |
| 18.1 | 18.4 | 19.3 | 19.4R3 |
| 18.2 | 19.1 | 19.4R3 | — |
| 18.3 | 19.2 | 19.4R3 | — |
| 18.4 | 19.3 | 19.4R3 | — |
| 19.1 | 19.4R3 | — | — |
| 19.2 | 19.4R3 | — | — |
| 19.3 | 19.4R3 | — | — |
| 19.4 | 19.4R3 | — | — |
| Junos OS Release | Target Junos OS (First Hop) | Target Junos OS (Second Hop) | Target Junos OS (Third Hop) |
|---|---|---|---|
| 15.1X49 | 19.4R3 | 20.4R3 | 21.2R3 |
| 19.4R3 | 20.4R3 | 21.2R3 | — |
| 20.1 | 20.4 | 21.2R3 | — |
| 20.2 | 21.2R3 | — | — |
| 20.3 | 21.2R3 | — | — |
| 20.4 | 21.2R3 | — | — |
| 21.1 | 21.2R3 | — | — |
| 21.2 | 21.2R3 | — | — |
| To Upgrade from Junos OS Release | Use This Path |
|---|---|
| 15.1X49-D170 to 19.4R3 | 15.1X49-D170 → 19.4R3 (direct upgrade) |
| 19.4 | 19.4R3→ 20.4R3 (direct upgrade) |
| 20.4 | 20.4R3→ 21.2R3 (direct upgrade) |
| 17.3 to 19.4R3 | 17.4R3 → 18.2 R3→18.4R3 → 19.4R3 (interim upgrade) |
| 18.2 to 21.2 | 18.2R3 → 18.4R3 → 19.4R3 → 20.4R3 → 21.2R3 (interim upgrade) |
| 19.4 to 21.2 | 19.4R3 → 20.4R3 → 21.2R3 (interim upgrade) |
Downgrading Junos OS
We support downgrades to up to three Junos OS releases at a time. You can downgrade to the Junos OS release that immediately precedes the current Junos OS release or to three Junos OS releases before the current release. For example, you can downgrade directly from Junos OS Release 20.2R1 to Junos OS Release 19.4R3. If you want to downgrade from Release 20.2R1 to Release 18.4R1, you must first downgrade to Release 19.3R1 and then to Release 18.4R1.
What's Next
Now that you’ve determined the Junos OS version upgrade path, proceed to perform upgrade procedures. See How to Upgrade to Junos OS Release 21.2R3.