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20.1R2-S1: Software Release Notification for JUNOS Software Version 20.1R2-S1



Article ID: TSB17972 TECHNICAL_BULLETINS Last Updated: 05 Feb 2021Version: 1.0
Alert Type:
SRN - Software Release Notification
Product Affected:
Alert Description:
Junos Software Service Release version 20.1R2-S1 is now available for download from the Junos software download site
Download Junos Software Service Release:
  1. Go to Junos Platforms - Download Software page
  2. Input your product in the "Find a Product" search box
  3. From the Type/OS drop-down menu, select Junos SR
  4. From the Version drop-down menu, select your version
  5. Click the Software tab
  6. Select the Install Package as need and follow the prompts

Junos Software service Release version 20.1R2-S1 is now available.

20.1R2-S1 - List of Fixed issues
PR Number Synopsis Category: MPC11 ULC fabric software related issues.
1546449 Plane offline IPC of chassisd may time out on MX devices with MPC11E linecards
On MX2010/MX2020 with MPC11E linecards, plane offline IPC event might be stuck and the line cards may restart. This issue may happen if there is a run time CRC error on Cascaded PFE and when both the planes associated with the link fault are made offline.
PR Number Synopsis Category: Multiprotocol Label Switching
1502993 CSPF job might get stalled for new/existing LSP in high scale LSP setup
In an MPLS-TE scenario with high scale LSPs (for example, 20,000), CSPF job might get stalled for new/existing LSP if some configuration changes (which impacts the rpd process) are done when constrained shortest path first (CSPF) job is suspended and pending. Traffic Engineering Database CSPF job goes in a state where it is not able to recover till the time rpd process is restarted. This defect could only be observed in 20.2R1 or 20.2R1-EVO release.
PR Number Synopsis Category: vMX Platform Infrastructure related issue tracking
1548422 Traffic with jumbo frame may be discarded on the vMX platforms
On the VMX platforms which are installed on ESXI 6.7 with vmxnet3 driver, traffic with jumbo frame (Packets with MTU more than 1500) may be discarded upon receiving.
PR Number Synopsis Category: QFX Platform related (SYSLOG/ALARMS/miscellaneous)
1539654 Cannot take RSI properly due to Authentication error
On QFX10k and PTX10k series which is running on 20.X release, cannot collect RSI properly due to authentication error.
PR Number Synopsis Category: KRT Queue issues within RPD
1539601 The rpd memory leak might be observed on the backup Routing Engine due to link flaps
On all junos platforms with dual REs, rpd memory leak may be seen when an AE member interface flaps or immediate restart of master RE. The memory leak was observed be around 32 bytes per session.
PR Number Synopsis Category: RPD policy options
1517128 JSA11099 Junos OS Evolved: Receipt of certain valid BGP update packets from BGP peers may cause RPD to core when using REGEX. (CVE-2021-0209)
In Juniper Networks Junos OS Evolved an attacker sending certain valid BGP update packets may cause Junos OS Evolved to access an uninitialized pointer causing RPD to core leading to a Denial of Service (DoS). Please refer to for more information.
PR Number Synopsis Category: SW PRs for SCBE3 fabric
1553641 The fabric errors are observed and the FPC processes might get offlined with SCBE3, MPC3E-NG, or MPC3E and MPC7 or MPC10 in the increased-bandwidth fabric mode.
On MX240/MX480/MX960 platforms, with default "increased-bandwidth" fabric mode and SCBE3, if we have MPC3 or MPC3-NG exist on the system along with high bandwidth MPC, during high traffic situation or bursty traffic through the fabric towards MPC3/MPC3-NG. MX fabric might report unreachable destination condition and causes fabric healing to trigger in. This issue is exacerbated when having MPC7 or MPC10 line cards installed due to high fabric bandwidth that can be generated.
PR Number Synopsis Category: Antivirus UTM issue
1557278 Stream buffer memory leak might happen when UTM is configured under unified policies.
On all Junos platforms that support unified policies (layer 7 application), stream buffer memory leak might happen when Unified Threat Management (UTM) Antivirus Protection (AV)/ Antispam Filtering (AS)/Content Filtering (CF) is configured under unified policies. If the stream buffer memory is exhausted, traffic related to UTM will be affected.

20.1R2-S1 - List of Known issues
PR Number Synopsis Category: Chassis mgmt for all QFX systems - chassis MIB, alarms, CLI
1481143 Chassisd cores might happen on backup RE after commit on QFX10Ks due to CHASSISD_MAIN_THREAD_STALLED for 200 seconds
Chassisd cores might happen on the backup RE after commit on QFX10K8/16s due to CHASSISD_MAIN_THREAD_STALLED for 200 seconds.
PR Number Synopsis Category: Virtual Router Redundancy Protocol
1558560 Junos device might send VRRP advertisement packets in VRRP init or idle state before startup-silent-period timer expiry after performing GRES on VRRP master device with NSR disabled
If VRRP master device has dual Routing Engines (REs) and GRES enabled but nonstop-routing (NSR) disabled, after performing GRES, both REs will move to VRRP init then idle state and the new master RE will send VRRP advertisement packets in this stage before startup-silent-period timer expiry. Since the VRRP backup device can still receive the VRRP advertisement packets with higher priority, it will not transition to VRRP master state and hence cause the longer traffic downtime until the VRRP master device re-take the VRRP mastership after startup-silent-period timer expiry.
Modification History:
First publication 2021-02-05
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