January 2004
Intermediate to advanced
536 pages
13h 2m
English
Content preview from IPv6, 2nd Edition
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Chapter 15 • IPv6 Quality of Service (QoS) 269
Using ECN and a Congestion Manager implementation, nodes are able
to negotiate the use of ECN. The ECN field in the IPv6 (and IPv4 header,
as well), consists of the two bits after the Differentiated Services field.
Unlike in earlier proposals, the two bits are used together as codepoints
rather than as separate flag bits. The four different values possible for these
two bits—00, 01, 10, and 11—indicate whether the end-nodes (sender and
destination) are using an ECN-Capable Transport as well as whether there
is congestion at the sender (though not so much congestion that would
cause the node to have dropped ...
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