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[MX] Aggregate Interface member links may fail to send traffic

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Article ID: KB24840 KB Last Updated: 13 Jun 2012Version: 1.0
Summary:
This article describes the issue of a child link being removed from a AE bundle and re-attached to it in Junos.
Symptoms:
  • In Junos releases 10.4R6, 10.4R7, 11.1R6, and 11.2R3, with the minimum-links option configured on an aggregate interface, this issue might occur.

  • If an aggregate bundle goes down due to 2 or more minimum-links being configured, bundle member links might not attach to the bundle; once the aggregate bundle comes back up.

  • Outbound traffic will not use an affected member link (no black holing) and inbound traffic for such a member link is properly processed and forwarded.

  • Customers who use aggregate interfaces, which are configured with the minimum-links option, are discouraged from using affected releases of Junos software.
Cause:
When a member link goes down, it may not get instantly re-attached to the bundle, when it comes back up
Solution:
Junos software has been modified to correct the defect. The modified code is available in Junos releases 10.4R8, 11.2R4, and 11.4R1 or later.

As a workaround, when a member link goes down and does not get re-attached to the aggregate interface, an operator can deactivate the member link and then activate it. This sequence will re-attach the link to the aggregate interface, which enables it to resume the carrying of traffic. This issue is being tracked under PR 695895.


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