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20.2R1-S1-EVO: Software Release Notification for JUNOS Software Version 20.2R1-S1-EVO

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Article ID: TSB17840 TECHNICAL_BULLETINS Last Updated: 12 Aug 2020Version: 1.0
Alert Type:
SRN - Software Release Notification
Product Affected:
PTX and QFX series running Junos Evolved
Alert Description:
Junos Software Service Release version 20.2R1-S1-EVO 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
Solution:

Junos Software service Release version 20.2R1-S1-EVO is now available.

20.2R1-S1-EVO - List of Fixed issues

PR Number Synopsis Category: PFE SW evo-pfemand,packet-io on BRCM platforms running EVO
1499009 QFX5220 does not support the following matches which were supported on QFX5200: first-fragment, tcp-established, Is-fragment, and Hop-limit.
Product-Group=evo
QFX5220 does not support the matches that were supported on QFX5200: ? first-fragment ? tcp-established ? Is-fragment ? Hop-limit
PR Number Synopsis Category: Tracking PD specific issues on BRCM platforms running EVO
1520133 QFX5220-32CD: CRC errors seen with 4x100G FR4/DR4 Optics in environmental stress test
Product-Group=evo
On QFX5220-32CD, CRC errors may be seen on random ports with 4x100G FR4/DR4 during stress test at high and cold temperature with voltage margin high.
PR Number Synopsis Category: DNX L2 related features
1517074 L2ALD crash is seen during stability test with traffic on scaled set-up.
Product-Group=evo
The L2ALD process on an ACX platform may restart unexpectedly during interface flaps.
PR Number Synopsis Category: Interface PRs defect & enhancement requests
1518692 Minimum IFD Mtu recommended with IPv6 configuration
Product-Group=evo
As per RFC 2464, the min datagram size supported is 1280 for IPv6.Including Ethernet header (14), the min IFD MTU value supported should be 1294. Up to Junos software version 20.1 release, it is allowed to set IFD MTU with a value less than 1294 bytes for IPv6 configuration. This configuration will result in traffic loss. Hence this configuration is not supported from 20.2 release onwards.
1521978 EVO-Brackla-PDT: Last Flapped of virtual interfaces like AE is not updated when AE transitions from DOWN to UP state
Product-Group=evo
Before and In release chain 19.4. Lastflap time on virtual interfaces like AE is not updated when interface transitions up. It is updated only when interface transitions down.
PR Number Synopsis Category: EVO MACSEC Platform Independent Implementation
1517985 PTX10008:-Do not Configure Confidentiality offset other than 0
Product-Group=evo
Configuring Confidentiality offset other than 0 does not work properly and can lead to traffic failure eventually.
PR Number Synopsis Category: EVPN Layer-2 Forwarding
1520078 Unable to create a new VTEP interface
Product-Group=evo
In all platforms with VXLAN Static VTEP tunnels scenario (including Static VXLAN without EVPN), after RE switchover or restart of l2-learning, if create a new VTEP interface, the interface may not work.
PR Number Synopsis Category: Express PFE CoS Features
1506855 Shapers applied on Interface Output Queues, either through the transmit-rate "exact" or "rate-limit" knob may not sometimes draw the expected output scheduler accuracy.
Product-Group=evo
Shapers applied on Interface Output Queues, either through the transmit-rate "exact" or "rate-limit" knob may not sometimes draw the expected output scheduler accuracy.
1514722 The evo-aftmand-bt might crash if FPC offline is performed during the system comes up
Product-Group=evo
During the system comes up, if FPC offline is performed,the evo-aftmand-bt crash might be seen.
PR Number Synopsis Category: Express PFE FW Features
1503145 There is a discrepancy of 22 bytes for the same exact packets between the firewall filter in EVO and in Junos
Product-Group=evo
There is a discrepancy of 22 bytes for the exact same packets between the firewall filter in Junos OS Evolved and in Junos OS. From an RPM perspective, probes are sent and received correctly. Issue is in the byte counts reported by the firewall filter.
PR Number Synopsis Category: Multiprotocol Label Switching
1502993 CSPF job might get stalled for new/existing LSP in high scale LSP setup
Product-Group=evo
On all Junos platforms under MPLS-TE scenario with high scale LSPs (e.g., 20K), CSPF job might get stalled for new/existing LSP if some configuration changes (which impacts the rpd process) are done when CSPF job is suspended and pending. TED (Traffic Engineering Database) CSPF (Constrained Shortest Path First) 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: KRT Queue issues within RPD
1505769 Configuring MTU at the IFF level greater than IFD MTU causes blocking traffic
Product-Group=evo
On EVO platforms, if MTU configured under physical interface (IFD) is greater than MTU configured under same interface with family inet or family inet6 (IFF), aftmand might have catastrophic event. In the end, no traffic could be forwarded by aftmand. Please make sure IFD MTU need to be configured with lower value than IFF MTU.
PR Number Synopsis Category: Bug and Review Tracking for Segment routing traffic eng
1513583 Modifying the segment list of the SR LSP might not work
Product-Group=evo
If "source-packet-routing segment-list" is configured, change in the number of hops might not be able to trigger route change with updated segment list.
PR Number Synopsis Category: Express PFE L2 fwding Features on ZX platforms
1511601 PFE generates MLP's with global-no-mac-learning enabled
Product-Group=evo
Global mac learning and policing (MLP) setting was not working when configured through CLI.
 

20.2R1-S1-EVO - List of Known issues

PR Number Synopsis Category: Express BT PFE L3 Features
1517828 Ip option transit traffic is being dropping at mid-points
Product-Group=evo
PTX IP option packet is not forwarded to next router.
1518368 Impact on the traffic throughput performace in some scenarios.
Product-Group=evo
When all 5X400g ports are used inside 1 portion of Chip, there can be impact on the traffic throughput performace.
1519839 EVO:Scapa With L3VPN/6vPE config in DUT, LDP-LFA link protection fails with continuous traffic loss in DUT [Regression issue]
Product-Group=evo
Issue EVO:Scapa With L3VPN/6vPE config in DUT, LDP-LFA link protection fails with continuous traffic loss in DUT will not be addressed in 20.2R1 release.
PR Number Synopsis Category: Issues related to evo operations - libevo infra, typeinfo ..
1519427 large number of publish-deleted hwdre anomalies are dumped after 2nd iteration of the switchover from re1 (master) to re0.
Product-Group=evo
large number of publish-deleted hwdre anomalies are dumped after 2nd iteration of the switchover from re1 (master) to re0.
PR Number Synopsis Category: software upgrade infra issues
1470943 Block unified ISSU commands from the CLI for Junos OS Evolved Release 19.4R1.
Product-Group=evo
Since ISSU is not supported in Junos OS Release 20.2R1 for PTX10008, following commands are removed/blocked from CLI 1. request system software validate-restart 2. Request system software add <> restart 3. show system software add-restart.
PR Number Synopsis Category: Ztp related issues
1518946 request system zeroize command does not reboot the device.
Product-Group=evo
request system zeroize command does not reboot the device.
PR Number Synopsis Category: Express PFE CoS Features
1478811 [cos] [scheduler] scapa:scheduler with all queues oversunscribed, max latency is different on different queues - 21ms ~ 29ms
Product-Group=evo
CoS scheduler: With all queues oversubscribed, maximum latency varies among queues (21ms to 29 ms)
1501083 PTX10008 EVO: Tail drops (VOQ drops) are consistently seen on a High priority queue (AF4) with "shared" buffer configs
Product-Group=evo
A PTX10008 system running Junos EVO software with "shared" buffer configuration may see Tail drops - aka VOQ drops - on the high priority queue (AF4). This happens when the number of packet flows is too low to properly load balance traffics over member links of AE interface bundles.
1519313 [cos] [scheduler] ardberg:scapa:10GE:serviceability:scheduler queue tx rate is wrong for case with "scheduler priority strict-high + tx-rate exact" configuration (l3_cos_schedulers.robot)
Product-Group=evo
queue tx rate is wrong for case with "scheduler priority strict-high + tx-rate exact" configuration (l3_cos_schedulers.robot)
1523066 With traffic running, if the FPC which is connected to traffic generator is rebooted, it might lead to stuck traffic scenario on certain ports post resumption.
Product-Group=evo
With traffic running, if the FPC which is connected to traffic generator is rebooted, it might lead to stuck traffic scenario on certain ports post resumption.
PR Number Synopsis Category: Chassis mgmt for all QFX systems - chassis MIB, alarms, CLI
1511155 The QFX10000-36Q line card used on QFX10008/QFX10016 platforms may fail to detect any QSFP
Product-Group=evo
On QFX10008/QFX10016 platforms with QFX10000-36Q line card used, if detecting an ASIC error of the line card, the QSFP might not be detected and then the PIC might be offline.
PR Number Synopsis Category: PTX10K platform specific fabric PRs
1497212 [fabric] [PTX10008]: 6 seconds convergence time is seen during fabric card removal
Product-Group=evo
On a PTX10008, six SIBs are required to carry line-rate traffic, with no fabric redundancy. Even when ingress traffic rate is such that five SIBs are sufficient to carry ingress traffic (for example, traffic is less than 1280 Gbps), ungraceful SIB failures result in transient loss of traffic, till system failure handling is triggered. In Junos OS Release 20.1R2, failure handling may result in about 4-6 seconds of traffic loss. We recommend that you take the fabric cards offline by using the request chassis sib offline command before removing the SIBs for maintenance.
 
Modification History:
First publication 2020-08-12
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