Nick, From https://www.exam-labs.com/blog/configuring-lacp-between-cisco-ios-and-junipe... Understanding LACP Failures and Common Pitfalls Link aggregation, although a robust feature, is susceptible to various issues. To resolve these problems effectively, network administrators must first understand the potential causes of LACP failures. Here are some of the most common causes for LACP issues: 1. Mismatched Configurations: Often, the primary reason for LACP failure is a misalignment in configurations between the two devices. This might include differences in LACP modes (active vs. passive), inconsistent port-channel settings, or mismatched VLANs. Proper alignment of settings across both devices is crucial to the successful negotiation of LACP. -mel On Sep 26, 2025, at 7:10 AM, Nick Hilliard <nick@foobar.org> wrote: Mel Beckman via NANOG wrote on 26/09/2025 06:33: Instead you configure one of the available hash-based distribution functions the two endpoints have in common. [...] In my own experience, packet loss on Cisco-Juniper LACP links has arisen from inconsistent or incompatible configurations. this analysis is straight down wrong. The hashing algos on each side of a LAG bundle are entirely independent of each other and there is no problem whatever with using different hashing algos on each side. Nick