Cisco Bug: CSCtd80083 - RDI sent with CCMs after dynamically changing encap and tags
May 10, 2018
- Cisco ASR 9000 Series Aggregation Services Routers
Known Affected Releases
Symptom: 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. Conditions: 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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