On Juniper Networks MX Series and EX9200 Series platforms with Trio-based MPC (Modular Port Concentrator) where Integrated Routing and Bridging (IRB) interface is configured and it is mapped to a VPLS instance or a Bridge-Domain, certain network events at Customer Edge (CE) device may cause memory leak in the MPC which can cause an out of memory and MPC restarts. When this issue occurs, there will be temporary traffic interruption until the MPC is restored. An administrator can use the following CLI command to monitor the status of memory usage level of the MPC: user@device> show system resource-monitor fpc FPC Resource Usage Summary Free Heap Mem Watermark : 20 % Free NH Mem Watermark : 20 % Free Filter Mem Watermark : 20 % * - Watermark reached Slot # % Heap Free RTT Average RTT 1 87 PFE
The following software releases have been updated to resolve this specific issue: 17.3R3-S9, 17.4R3-S3, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.2R3-S1, 19.4R2-S3, 19.4R3, 20.2R1-S3, 20.2R2, 20.3R1, and all subsequent releases. The fix has been proactively committed to other releases as well.
There are no viable workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=18.2R3-S4<18.2* | 18.2* | advisory ↗ |
| Juniper Networks Junos OS | >=18.3R3-S2<18.3* | 18.3* | advisory ↗ |
| Juniper Networks Junos OS | >=18.4R3-S1<18.4* | 18.4* | advisory ↗ |
| Juniper Networks Junos OS | >=19.2R2<19.2* | 19.2* | advisory ↗ |
| Juniper Networks Junos OS | >=19.4R2<19.4* | 19.4* | advisory ↗ |
| Juniper Networks Junos OS | >=20.2R1<20.2* | 20.2* | advisory ↗ |