IS-IS 2011-03-02 2017-10-24 For IS-IS registries and value ranges maintained via the "Expert Review" registration procedure, guidance for IESG-designated experts can be found in . IETF Review 0-9 Unassigned 10 FS-LSP 11 FS-CSNP 12 FS-PSNP 13-14 Unassigned 15 L1-LAN-HELLO-PDU ISO-10589 16 L2-LAN-HELLO-PDU ISO-10589 17 P2P-HELLO-PDU ISO-10589 18 L1-LSP-PDU ISO-10589 19 Unassigned 20 L2-LSP-PDU ISO-10589 21-22 Unassigned 23 MTU-PROBE-PDU 24 L1-CSNP-PDU ISO-10589 25 L2-CSNP-PDU ISO-10589 26 L1-PSNP-PDU ISO-10589 27 L2-PSNP-PDU ISO-10589 28 MTU-ACK-PDU 29-31 Unassigned Expert Review Chris Hopps, Hannes Gredler, Les Ginsberg Values 1 - 63 are reserved for PDUs which use standard TLVs and standard sub-TLVs. Values 64 - 127 are reserved for PDUs which use extended TLVs and extended sub-TLVs. 0 Reserved 1 Level 1 Circuit Flooding Scope Extended/Standard y y n 2 Level 2 Circuit Flooding Scope Extended/Standard y n y 3 Level 1 Flooding Scope Extended/Standard y y n 4 Level 2 Flooding Scope Extended/Standard y n y 5 Domain Flooding Scope Extended/Standard y y y 6-63 Unassigned 64 Level 1 Circuit Flooding Scope Extended/Extended y y n 65 Level 2 Circuit Flooding Scope Extended/Extended y n y 66 Level 1 Flooding Scope Extended/Extended y y n 67 Level 2 Flooding Scope Extended/Extended y n y 68 Domain Flooding Scope Extended/Extended y y y 69-127 Unassigned