Alert Type

SRN - Software Release Notification
Low/NotificationSRN
Low/NotificationSRN

Product Affected

ACX PTX QFX running Junos Evolved software

Alert Description

Junos Software Service Release version 25.4R1-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

NOTE: Starting on August 30th, 2024, we include PR's severity with each entry. See KB86335 [juniper.net] for the definition of PR's Severity

 

Junos Selective Update (JSU) feasible

Not applicable

Call to Action

For your review

Solution

Junos Software service Release version 25.4R1-S2-EVO is now available.

25.4R1-S2-EVO - List of Fixed issues

PR NumberSynopsisCategory: PTX1000s Interfaces software
1921097
Major		Commit failure when configuring any WAN interface with the keyword unused
Product-Group=evo
Severity=Major		On the PTX10002-36QDD platform running Junos Evolved, any configuration that includes a Wide Area Network (WAN) interface with the keyword unused fails to commit, without impacting protocols or traffic on the WAN interface.
PR NumberSynopsisCategory: PTX10000s Platform Resiliency
1931372
Minor		[PTX10002] When the system is rebooted with "power-optimized" configured, a "FPC 0 Major Errors" alarm is triggered due to a pll_lock_error on the BX chip.
Product-Group=evo
Severity=Minor		On the PTX10002, when the system is rebooted with the power-optimized setting enabled, a "PLL lock error" may be detected, and an "FPC 0 Major Errors" alarm may be observed.
PR NumberSynopsisCategory: Border Gateway Protocol
1926835
Minor		AS path loop may not be detected with VPN route when autonomous-system independent-domain is configured with 'no-attrset' option
Product-Group=evo
Severity=Minor		AS path loop may not be detected with VPN route when autonomous-system independent-domain is configured with 'no-attrset' option under routing-options hierarchy
PR NumberSynopsisCategory: QOS issues in EVO for BCM XGS Platforms
1880166
Major		ECN CE bit is not set in an EVPN-VxLAN scenario
Product-Group=evo
Severity=Major		On QFX5130/QFX5700 platforms, in Ethernet VPN-Virtual Extensible LAN (EVPN-VxLAN) scenario, the Explicit Congestion Notification (ECN) Congestion Experienced (CE) bit will not be set for ECN-capable traffic when there is congestion. Since the CE bit is not set, packets will be dropped.
PR NumberSynopsisCategory: PFE L2 forwarding features on BT based platforms
1890878
Major		On PTX EVO platforms in EVPN-VXLAN scenario traffic will not egress out of the irb next-hop when the bridge-domain doesn't have VXLAN VNI configured
Product-Group=evo
Severity=Major		On all PTX Evolved platforms that support EVPN-VXLAN (Ethernet VPN-Virtual Extensible LAN), when the PTX router acts as a MAC-VRF (Media Access Control - Virtual Routing and Forwarding) EVPN gateway, it will fail to forward traffic routed through the 'irb' interface due to packets being discarded at PFE (packet forwarding Engine), causing packet loss.
PR NumberSynopsisCategory: Express BT PFE L3 Features
1916954
Major		Traffic loss observed when restart routing is performed on L3VPN BGP-LU setup
Product-Group=evo
Severity=Major		On PTX10001-36MR, PTX10008 and PTX10016 Junos platforms, when preserve-nexthop-hierarchy is configured and restart routing is performed, then ipv4/ipv6 Layer 3 Virtual Private Network(l3vpn) traffic going over Border Gateway Protocol (BGP)-Labelled Unicast (LU) path may get dropped on downstream routers due to next hop not getting updated properly.
1939686
Major		Disabling On Box Blackhole Detection by Default
Product-Group=evo
Severity=Major		Reverting the "Blackhole Detection" from the "default on" to the "default off". This makes the behavior consistent with pre-Junos Evolved 25.4-EVO software.
PR NumberSynopsisCategory: QFX Control Plane VXLAN
1921796
Minor		Traffic dropped after priority change in VRRP with EVPN-VxLAN scenario
Product-Group=evo
Severity=Minor		On all Junos and Junos Evolved platforms, in Virtual Router Redundancy Protocol (VRRP) with Ethernet Virtual Private Network - Virtual Extensible Local Area Network (EVPN-VXLAN) scenario, when VRRP priority is changed, the VRRP virtual Media Access Control (MAC) address can remain pinned as a static entry on the remote device. As a result, MAC movement does not occur correctly, and VRRP packets are dropped on the leaf device. This impacts VRRP operation after priority changes.
PR NumberSynopsisCategory: EVO Class of Services
1858634
Critical		Telemetry subscription to path /qos/interfaces/interface/output/ queues/queue/state/transmit-pkts showing incorrect result
Product-Group=evo
Severity=Critical		Telemetry subscription to path /qos/interfaces/interface/output/queues/ queue/state/transmit-pkts showing incorrect result
PR NumberSynopsisCategory: SNMP, mib2d issues
1932267
Major		SNMP traps related to optics/optic's media lane alarms will not be raised
Product-Group=evo
Severity=Major		On Junos OS Evolved platforms, SNMP(Simple Network Management Protocol) management systems do not receive related to optics or transceiver lane and module alarm traps.
PR NumberSynopsisCategory: Enhanced Broadband Edge support for firewall
1928462
Major		FPC crash occurs after configuration changes are made to a service-filter on specific MX platforms
Product-Group=evo
Severity=Major		FPC crash and aftd-trio core-dump will be observed on MX platforms supporting MPC10E, MPC11E, LC9600 line cards, and MX304 after configuration changes were made to a service-filter which was in use by BBE subscribers.
PR NumberSynopsisCategory: ACX7348 PTP
1892686
Major		PTP delay message sent from different LAG after RE switchover
Product-Group=evo
Severity=Major		On Junos OS Evolved ACX7332 and ACX7348 platforms, after Routing Engines( RE) switchover the Precision Time Protocol (PTP) delay message is sent from different REs when Link Aggregation Group (LAG) members are configured on different Flexible PIC Concentrators (FPCs) leading to PTP timing discrepancy.
PR NumberSynopsisCategory: ACX7509 Linecard (FPC) related issues
1931077
Major		CRC errors and packet loss are being observed at the peer device when using 1G fibre optic connections
Product-Group=evo
Severity=Major		On Junos OS Evolved ACX7509, ACX7348, ACX7332, and ACX7100-32C platforms with 1G fibre Optics, when the Inter-Packet Gap (IPG) setting intermittently falls below the IEEE minimum requirement of 8 bytes, and traffic passes through the PHY, certain receiving devices are sensitive to this reduced IPG, which leads to CRC (Cyclic Redundancy Check) errors and packet loss on the peer device connected to 1G fibre optics connection.
PR NumberSynopsisCategory: Layer2 forwarding on EX/NFX/PTX/QFX
1928530
Critical		A buffer overflow during IPv6 NDP operations in an EVPN environment caused segmentation faults leading to FPC crash files and repeated reboots
Product-Group=evo
Severity=Critical		On JunOS MX240/MX480/MX960/ MX2008/MX2010/MX2020 platforms with MPC10E/MPC11E line cards as well as the MX304 platform, an issue in IPv6 EVPN (Ethernet Virtual Private Network) during NDP (Neighbor Discovery Protocol) resolicitation of a link local target address causes the system to use the IRB link local address in outgoing packets. Stack corruption happens when handling the IRB link local address and resulting in continuous FPC (Flexible PIC Concentrator) reboots (around 3 or 4 times) and crash files generation.
PR NumberSynopsisCategory: Port-based link layer security services and protocols that a
1921529
Minor		License Feature used is shown 0 for MACSec Bandwidth Usage (in gbps) although MACSec license is installed and used
Product-Group=evo
Severity=Minor		License Feature used is shown 0 for MACSec Bandwidth Usage (in gbps), although MACSec license is installed and used.
PR NumberSynopsisCategory: Protocol Independant Multicast
PR NumberSynopsisCategory: Authentication, Authorization, Accounting, PAM (RADIUS/tacplus)
1926050
Major		The auditd process crashes when the Radius server is configured but unreachable
Product-Group=evo
Severity=Major		On Junos OS and Junos OS Evolved having the Radius (Remote Authentication Dial-In User Service) server with accounting configured, the auditd crash is observed if the Radius server is unreachable for a long time and a large number of accounting records accumulate, which leads to memory exhaustion during accounting processing and results in a process crash.

 

 

25.4R1-S2-EVO - List of Known issues

PR NumberSynopsisCategory: PFE L2 forwarding features on BT based platforms
1928605
Minor		IRB routed traffic is dropped when both hosts are learned on the same SP-style Layer 2 interface on EVO-PTX platforms
Product-Group=evo		On all Junos OS Evolved PTX platforms, IRB (Integrated Routing and Bridging) routed traffic is dropped when both source and destination hosts are reachable through the same Service Provider (SP)-style Layer 2 IFL (Logical Interface) and associated IRB interface.

Resolved In: evo:24.2R2-S5-EVO evo:25.4R2-EVO evo:26.2R1-EVO
PR NumberSynopsisCategory: EVO Class of Services
1930528
Major		dscp-code-point under host-outbound-traffic is not enabled on PTX
Product-Group=evo		set class-of-service host-outbound-traffic dscp-code-point was disabled on PTX in 25.4R1. Later it was enabled in 26.2R1 and backported to 25.4R2

Resolved In: evo:25.4R2-EVO evo:26.2R1-EVO junos:25.4R2 junos:26.2R1
PR NumberSynopsisCategory: software upgrade infra issues
1927502
Major		JDI-REG:VIRTUAL:EVO-Suite fails due to SSH reconnection timeout as textchannel creation to RE device fails after reboot
Product-Group=evo		EVO-Suite fails due to SSH reconnection timeout as textchannel creation to RE device fails after reboot

Resolved In:
PR NumberSynopsisCategory: EVO MACSEC Platform Independent Implementation
1926159
Major		Dropping packets on PTX PE from any ingress PE device adds padding to IPv6 packets going over MPLS L3VPN
Product-Group=evo		On all Junos Evolved PTX series platforms, when acting as egress PE router, it drops padded packets from any ingress PE device. When this occurs, the packets that are discarded are padding to small IPv6 packets going over MPLS L3VPN. If the padding is removed, they are forwarded as expected.

Resolved In: evo:23.4R2-S6-J19-EVO evo:23.4R2-S8-EVO evo:25.4R2-EVO evo:26.2R1-EVO
PR NumberSynopsisCategory: Configd, ffp issues
1907238
Minor		Rescue Configuration Check Fails
Product-Group=evo		On all Junos OS Evolved ACX platforms, that cannot verify the syntax and integrity of the saved rescue configuration file when performing a configuration check.

Resolved In: evo:25.2R2-S1-EVO evo:25.4R2-EVO evo:25.4X300-EVO evo:26.1R1-EVO evo:26.2R1-EVO
PR NumberSynopsisCategory: Port-based link layer security services and protocols that a
1932925
Critical		MACsec traffic encryption/decryption failure post SFP OIR with interface and session in up state
Product-Group=evo		On MX301 platform, After SFP (Small Form-factor Pluggable transceiver) Online Insertion and Removal (OIR) on a MACsec (Media Access Control Security) enabled interface, the link and MACsec session remain UP, but MACsec encryption and decryption stop functioning. This results in traffic loss and causes service impact.

Resolved In:
PR NumberSynopsisCategory: Category for QFX5K EVO Platform Software PRs related to Inte
1868377
Major		After hitless reboot, "unused" ports remain "Disabled" in HW
Product-Group=evo		To ensure proper functionality of hitless restart/ISSU, do not mark any port as "unused".

Resolved In: evo:26.2R1-EVO evo:26.3R1-EVO
PR NumberSynopsisCategory: QFX5K EVO Platform Optic
1900911
Major		Hillside: 16x100G PIC: Commit check added when 40G and 100G xcvrs are put to share a Broadcom serdes core
Product-Group=evo		Hillside: 16x100G PIC: Commit check added when 40G and 100G xcvrs are put to share a Broadcom serdes core

Resolved In:
PR NumberSynopsisCategory: PTX10K Line Card specific interface PRs
1937870
Minor		Incorrect module temperature readings trigger unintended optics shutdown
Product-Group=evo		On MX platforms with MPC11, LC9600, LC4800 Linecards, MX304 and all Junos OS Evolved platforms, optics modules intermittently reports extremely high false temperature values in "show interfaces diagnostics optics" command. This can trigger false high-temperature alarms, leading to unnecessary optics shutdown.

Resolved In: evo:23.4R2-S6-J22-EVO evo:23.4R2-S8-EVO evo:24.4R2-S3-J7-EVO evo:25.2X100-D20-EVO evo:25.2X100-EVO evo:26.2R1-EVO evo:26.3R1-EVO junos:25.4R2 junos:26.2R1
PR NumberSynopsisCategory: PTX10K specific platform PRs
1771483
Major		EVO: RPC "get-power-usage-information" for cli "show chassis power" shows error wtih ODL response
Product-Group=evo		RPC "get-power-usage-information" for cli "show chassis power" shows error wtih ODL response

Resolved In:
PR NumberSynopsisCategory: Issues related to NETCONF
1792554
Minor		JUNOS: Netconf: Edit-config with operation attribute create for existing hierarchy is not working as per RFC 6241
Product-Group=evo		JUNOS: Netconf: Edit-config with operation attribute create for existing hierarchy is not working as per RFC 6241

Resolved In:
PR NumberSynopsisCategory: Issues related to YANG Data Models
1815644
Minor		Few of the yang package are unvailable in GNMI capability response
Product-Group=evo		Few of the yang package are unvailable in GNMI capability response

Resolved In:

 

Modification History

First publication 2026-05-06