Alert Type

PSN - Product Support Notification

Product Affected

All products running JUNOS 16.1 or later using MPLS LSPs

Alert Description

MPLS LSP "self-ping" is a new feature and is enabled by default in JUNOS 16.1 or later. This PSN emphasizes necessary steps that you need to take to make sure of successful upgrade.

Solution

In summary

  • LSP self-ping is on by default starting with JUNOS 16.1R1
  • LSP self-ping relies on sending UDP datagram with destination port 8503 (IPv4 and IPv6 as needed). If there is a loopback filter, you need to allow UDP destination port 8503 to get through your loopback filter
  • Since Circuit Cross-Connect (CCC) LSPs is neither IPv4 nor IPv6, LSP self-ping is not supported on such LSPs. Hence, you need to turn off LSP self-ping for these LSPs using the following configuration:
no-self-ping

WARNING :   PR1303798  In a rare circumstance, a device may experience a restart after upgrading its software to JUNOS software version with self-ping enabled. The contributing factor to the restart is applicable to all platforms. However, it has been mostly seen on a 32-bit system such as a QFX5100 or when forcing RPD to run in 32-bit mode via "set system process routing force-32-bit" configuration command.

Modification History

Update on 2019-03-08

  • Fixing grammar mechanic
  • Publishing this to the public on 2019-03-08
First publication date is 2017-12-13

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