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Cisco Bug: CSCtd80083 - RDI sent with CCMs after dynamically changing encap and tags

Last Modified

Jan 12, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

3.9.1.BASE 4.0.0.BASE

Description (partial)


Following a specific sequence of configuration events in a set of nested domains (see conditions below).  It is possible to get into a state where CFM in the outermost domain is sending RDI when there is currently no remote defect in the network.


This issue can only occur with nested domains, and only following specific configuration changes on a MEP in the inner domain which would have caused CCMs from the inner domain to 'leak' to the outer domain.

An example scenario is as follows:

Four interfaces, connected as follows:

A --- B --- C --- D

A & B on the same router, A is configured with a level 5 UP MEP, B is configured with a level 3 DOWN MEP.

C & D on the same router, D is configured with a level 5 UP MEP, C is configured with a level 3 DOWN MEP.

The user has configured B & C with a QinQ encapsulation.

In order to trigger the error case, the user configures 'encapsulation default' on C.  This causes the MEP to be removed & CCMs from B to 'leak' to D.  D sees these CCMs, identifies a potential problem with intersecting domains &, as per the standard, sets RDI due to wrong level & wrong MAID.

When the user reconfigured the QinQ encapsulation, the RDI bit may not be cleared on D.
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