RFC-Editor notes:
1) Third paragraph of section 2.5 - expand DCN.
OLD:
used in legacy DCN environments that use OSI CLNP.
NEW:
used in legacy Data Communication Network (DCN) environments
that use OSI CLNP.
2) For section 2.5 - Add a final paragraph:
The security risks of additional non-IP encapsulations MUST be
described, since the mandatory to implement mechanism of IPsec
is not available for these control channels, as in the RFC 3293
Ethernet and ATM cases. It is in scope to perform risk analysis
and describe if mechanisms for link-level security mitigate the
risk.
3) reword text in section 3.3
OLD:
A retransmission policy should be used if no reply is
received for a message with "AckAll" set.
NEW:
A retransmission policy with a well-designed exponential
backoff should be used if no reply is received for a
message with "AckAll" set.