Restrictions of DCC
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Only routing IP and OSI domains are supported; layers 4–7 of OSI model is not supported.
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Interworking of OSPI and IP domains is not supported.
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CLNS MTU supported is 1489 on routers.
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CLNS interoperability with ONS is not supported.
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IS-IS packet bigger than LAPD MTU is not dropped.
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1+1 APS with CLNS mode is not supported.
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During a CRC mismatch, the interface reaches Up state under the LAPD UITS mode after SSO.
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Under LAPD encapsulation mode, the default LAPD role and modes are not displayed in the running configuration.
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DCC termination on APS controllers is not supported.