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20.1R2-S2-EVO: Software Release Notification for JUNOS Software Version 20.1R2-S2-EVO

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Article ID: TSB17850 TECHNICAL_BULLETINS Last Updated: 02 Sep 2020Version: 2.0
Alert Type:
SRN - Software Release Notification
Product Affected:
PTX and QFX series running Junos Evolved
Alert Description:
Junos Software Service Release version 20.1R2-S2-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 20.1R2-S2-EVO is now available.

20.1R2-S2-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: 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: Lacp related problems and issues.
1518542 The AE interface might flap after performing GRES on Junos EVO systems
Product-Group=evo
On all Junos EVO systems, if micro BFD (Bidirectional Forwarding Detection) is configured on the AE (Aggregate Ethernet) interface, the AE interface might flap after performing GRES (Graceful Routing Engine Switchover). Traffic loss might be seen during the interface flap.
PR Number Synopsis Category: EVO RPD agent PRs
1527399 EVO:Grid: Tracking PR for Rpd-agent memory
Product-Group=evo
rpd-agent daemon has a minor memory leak when it receives certain states.
PR Number Synopsis Category: Express PFE CoS Features
1521281 [cos] [scheduler] EVO SCAPA: The "show interfaces voq < intf/ae> non-zero" command is not working as expected / displays incorrect output
Product-Group=evo
The "show interfaces voq < intf/ae> non-zero" command output does not work as expected. "Non-zero" filter will correctly apply only when the wred-drops values are non-zero.
PR Number Synopsis Category: Path computation client daemon
1508412 [northstar_pccd] [tag_ero] EVO-Brackla :: change of ero on branch lsp,sometimes causing issues
Product-Group=evo
When the ERO of a particular branch is updated and the update goes to PCC just for this branch then the issue will be seen.
PR Number Synopsis Category: PTX10K platform specific fabric PRs
1512272 SIB <> FPC Link Errors seen prior to switchover do not get cleared when switchover is followed by SIB restart.
Product-Group=evo
SIB <> FPC Link Errors seen prior to switchover do not get cleared when switchover is followed by SIB restart.
PR Number Synopsis Category: PTX10K specific platform PRs
1527790 Hwdre cored when trying to take faulty sib to offline state
Product-Group=evo
Application hwdre may core and restart when trying to take faulty sib to offline state.
 

20.1R2-S2-EVO - List of Known issues
PR Number Synopsis Category: PFE SW evo-pfemand,packet-io on BRCM platforms running EVO
1513109 servicability scheduler on LAG with 2 member links doesn't work
Product-Group=evo
QFX running Junos Evolved's "scheduler" on LAG interfaces with 2 member links does not work properly 
1521531 Scheduling variance will be seen when queue 3 & 4 congested on QFX5220
Product-Group=evo
QFX5220 - Class of Service - Scheduling transmit rate & shaping rate variance will be seen on QFX5220 when Queue 3 & Queue 4 congested along with other queues.
PR Number Synopsis Category: management ethernet related issues - mgmt-ethd daemon
1458228 The aggregated Ethernet LACP Distributed Mode - "show ppm adjacencies" does not show FPC slot number in Distribution address
Product-Group=evo
"show ppm adjacencies" in Junos Evolved show an internal IP address instead of FPC slot number in the Distribution address
PR Number Synopsis Category: System Management High availability
1519364 GRES: show system switchover is not showing the correct state
Product-Group=evo
There is a delay enforced between back to back switchover. This is 360 seconds unless overridden by platform specific values. So, if the last switchover happened within the last 360 seconds, then it will give this error: "Not ready for mastership switch, try after x seconds?. The "show system switchover" CLI output might show "Switchover Status: Ready". But this field indicates the ready status of all applications on backup RE. This does not consider the back-to-back switchover delay.
PR Number Synopsis Category: mgd, ddl, odl infra issues
1511303 < data> tag not found in xml output generated by rli16039combination_filter_sd.xml.
Product-Group=evo
Eventd reads the hostname from /etc/hostname file and updates the same in all syslog files. During bootup time /etc/hostname were not updated by mgd and eventd reads the default hostname. The issue got fixed in PR 1511303 by mgd folks in recent builds. This doesn't impact the functionality and this is a high risk to backport the change(AT#82, AT#87, and AT#90 ) As a workaround, Kindly restart the relay event to avoid this issue.
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)
1485478 In strict-priority mode, with any form of rate-limiter/shaper configured, it might create some accuracy gaps in the scheduler across queues.
Product-Group=evo
BGP started creating route pointing to List NH having INDIRECT members inside after comcast N+1 feature. But resolver treats LIST NH as a leaf node and does not do loop detection inside List NH members (Day 1 behavior). This causes wedges in Packet Forwarding Engine as loop detection does not happen.
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.
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.
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: Express PFE FW Features
1499294 On a QFX5220 :: show firewall cli shows error error: communication failure with /re0/evo-pfemand/ when unique filter is applied over all physical interfaces.
Product-Group=evo
show firewall cli shows error error: communication failure with /re0/evo-pfemand/ when unique filter is applied over all physical interfaces.
PR Number Synopsis Category: Express PFE MPLS Features
1472908 Traffic loss of up to 400 ms can be seen in MPLS FRR scenario
Product-Group=evo
Traffic loss of upto 400 ms is seen during MPLS FRR test with following scale: 600K IPv4 routes 40K IPv6 routes 19K Transit LSPs 1.6K ingress LSPs 10K BGP LU.
1517870 MPLS ping will not work RSVP LSP with UHP configured
Product-Group=evo
MPLS ping will not work RSVP LSP with UHP configured
PR Number Synopsis Category: Path computation client daemon
1481462 [northstar_pccd] [tag_rro_mismatch]  After interface flap,RRO mismatch between pcep and mpls(p2mp)
Product-Group=evo
There is a minor data mismatch in RRO between PCE and PCC.
PR Number Synopsis Category: Resource Reservation Protocol
1518968 After graceful switchover, ingress RSVP sessions go down and take up to 5 minutes to come up.
Product-Group=evo
After graceful switchover, ingress RSVP sessions in new master go down and take up to 5 minutes to come up.
PR Number Synopsis Category: PTX10K platform specific fabric PRs
1511918 fabric_down_condition_on_pfe errors not cleared when fpc is offlined after fabricHub app restart
Product-Group=evo
fabric_down_condition_on_pfe errors not cleared when fpc is offlined after fabricHub app restart
1514668 Sib fault errors and alarms are not cleared after sib is recovered following fabspoked-fchip abrupt kill and restart
Product-Group=evo
Sib fault errors and alarms may not get cleared after sib is recovered following fabspoked-fchip process' abrupt kill and restart.
1515790 For fabspoked-pfe, 'Restart Supported' and 'Restart Node' flags are incorrect in the output of 'show system applications app'
Product-Group=evo
For fabspoked-pfe, 'Restart Supported' and 'Restart Node' flags are incorrect in the output of 'show system applications app fabspoked-pfe detail'. Show command shows that app can be restarted without needing node reboot, but restarting the app leads to node reboot.
PR Number Synopsis Category: PTX10K RE EVO Issues
1503269 [generic_evo] - PTX1008: RCB: Switchover Status is not reflecting as expected at "show system switchover" in new backup post performing mastership switchover
Product-Group=evo
According to the current implementation, to display switchover status using the show system switchover command on backup, only the readiness of configuration database, object database and applications: ready state are considered. It does not check for the output of the request chassis routing-engine master switch check command. As a result, in some of the cases the output of both the commands could be different for 'switchover readiness' for a short duration of time. This is a day-1 behavior in Junos OS Evolved.
 
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