Re: Sites unreachable while traversing Dallas IXP

[Mel Beckman via NANOG <nanog () lists nanog org>]

Nick,

From
https://www.exam-labs.com/blog/configuring-lacp-between-cisco-ios-and-juniper-junos-a-step-by-step-guide

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
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