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An ICMPv6 error must not be generated in response to another ICMPv6 error or to an ICMPv6 Redirect message. An error must not answer IPv6 or link-layer multicast, except for Packet Too Big and the defined Parameter Problem Code 2 case.
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A unique local IPv6 prefix uses FC00::/7, a local-assignment bit, a 40-bit Global ID, a 16-bit subnet ID, and a 64-bit interface ID. A locally assigned Global ID must be generated with a pseudo-random algorithm to make independent /48 prefix collisions highly unlikely.
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The BGP COMMUNITIES attribute is optional and transitive and contains a variable-length set of four-octet community values.
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A host must not send ICMP Source Quench, and TCP must silently discard any Source Quench it receives. A router must ignore every received ICMP Source Quench message. UDP, SCTP, DCCP, and any other transport instance must silently ignore or discard a received Source Quench.
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A confederation member uses its confederation identifier with outside peers and its Member-AS number with peers inside the same confederation.
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The DS field uses a six-bit DSCP to select per-hop behavior; the remaining two bits are excluded from that selection. A compliant node must match the entire six-bit DSCP and support a configurable mapping from codepoints to per-hop behaviors.
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The ADD-PATH capability declares, separately for each AFI/SAFI, whether the sender can receive paths, send paths, or do both. A speaker may send multiple paths for an AFI/SAFI only when it advertised send capability and its peer advertised receive capability for that same AFI/SAFI.
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TCP negotiates ECN with ECE and CWR set on the initiating SYN and only ECE set on the responding SYN-ACK; neither endpoint may set ECT on data until both directions complete ECN setup. A receiver echoes a received CE mark with ECE acknowledgments until it receives CWR from the sender.
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MP_REACH_NLRI advertises reachable prefixes and their next hop, with AFI and SAFI identifying the address-family semantics. MP_UNREACH_NLRI withdraws multiple routes for the AFI and SAFI carried in that attribute.
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IPv6 optional internet-layer headers form a Next Header chain, and the first value that is not an extension header identifies the following upper-layer header.
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