Multiprotocol Label Switching Architecture (MPLS) 2006-01-12 2013-01-08 0-191 Standards Action 192-251 Specification Required Experimental RFC needed 252-255 Vendor Private Use MUST NOT be allocated 1 MPLS Echo Request 2 MPLS Echo Reply 3-251 Unassigned 252-255 Reserved for Vendor private use 0-191 Standards Action 192-251 Specification Required Experimental RFC needed 252-255 Vendor Private Use MUST NOT be allocated 1 Do not reply 2 Reply via an IPv4/IPv6 UDP packet 3 Reply via an IPv4/IPv6 UDP packet with Router Alert 4 Reply via application level control channel 5 Reply via specified path (TEMPORARY - expires 2012-01-20) 6-251 Unassigned 252-255 Reserved for Vendor private use 0-191 Standards Action 192-251 Specification Required Experimental RFC needed 252-255 Vendor Private Use MUST NOT be allocated 0 No return code 1 Malformed echo request received 2 One or more of the TLVs was not understood 3 Replying router is an egress for the FEC at stack-depth <RSC> 4 Replying router has no mapping for the FEC at stack-depth <RSC> 5 Downstream Mapping Mismatch (See ) 6 Upstream Interface Index Unknown (See ) 7 Reserved 8 Label switched at stack-depth <RSC> 9 Label switched but no MPLS forwarding at stack-depth <RSC> 10 Mapping for this FEC is not the given label at stack-depth <RSC> 11 No label entry at stack-depth <RSC> 12 Protocol not associated with interface at FEC stack-depth <RSC> 13 Premature termination of ping due to label stack shrinking to a single label 14 See DDM TLV for meaning of Return Code and Return SubCode 15 Label switched with FEC change 16-251 Unassigned 252-255 Reserved for Vendor private use The Return Subcode contains the point in the label stack where pro- cessing was terminated. If the RSC is 0, no labels were processed. Otherwise the packet would have been label switched at depth RSC. 0-16383 Standards Action This range is for mandatory TLVs or for optional TLVs that require an error message if not recognized. 16384-31743 Specification Required Experimental RFC needed 31744-32767 Vendor Private Use MUST NOT be allocated 32768-49161 Standards Action This range is for optional TLVs that can be silently dropped if not recognized. 49162-64511 Specification Required Experimental RFC needed 64512-65535 Vendor Private Use MUST NOT be allocated 1 Target FEC Stack 1 1 LDP IPv4 prefix 1 2 LDP IPv6 prefix 1 3 RSVP IPv4 LSP 1 4 RSVP IPv6 LSP 1 5 Not Assigned 1 6 VPN IPv4 prefix 1 7 VPN IPv6 prefix 1 8 L2 VPN endpoint 1 9 "FEC 128" Pseudowire - IPv4 (DEPRECATED) 1 10 "FEC 128" Pseudowire - IPv4 1 11 "FEC 129" Pseudowire - IPv4 1 12 BGP labeled IPv4 prefix 1 13 BGP labeled IPv6 prefix 1 14 Generic IPv4 prefix 1 15 Generic IPv6 prefix 1 16 Nil FEC 1 17 RSVP P2MP IPv4 Session 1 18 RSVP P2MP IPv6 Session 1 19 Multicast P2MP LDP FEC Stack 1 20 Multicast MP2MP LDP FEC Stack 1 21 Unassigned 1 22 Static LSP 1 23 Static Pseudowire 1 24 "FEC 128" Pseudowire - IPv6 1 25 "FEC 129" Pseudowire - IPv6 2 Downstream Mapping (DEPRECATED) 3 Pad 4 Not Assigned 5 Vendor Enterprise Number 6 Not Assigned 7 Interface and Label Stack 8 Not Assigned 9 Errored TLVs 9 Any value The TLV not understood 10 Reply TOS Byte 11 P2MP Responder Identifier 11 1 IPv4 Egress Address P2MP Responder 11 2 IPv6 Egress Address P2MP Responder 11 3 IPv4 Node Address P2MP Responder 11 4 IPv6 Node Address P2MP Responder 12 Echo Jitter 13 Source ID 14 Destination ID 15 BFD Discriminator 16 Reverse-path Target FEC Stack (NOTE: all current and future sub-TLVs for Target FEC Stack also apply to this TLV) 17-19 Unassigned 20 Downstream Detailed Mapping 20 1 Multipath data 20 2 Label stack 20 3 FEC stack change 21 Reply Path (TEMPORARY - expires 2012-01-20) 21 1 LDP IPv4 prefix (TEMPORARY - expires 2012-01-20) 21 2 LDP IPv6 prefix (TEMPORARY - expires 2012-01-20) 21 3 RSVP IPv4 LSP (TEMPORARY - expires 2012-01-20) 21 4 RSVP IPv6 LSP (TEMPORARY - expires 2012-01-20) 21 5 Not Assigned (TEMPORARY - expires 2012-01-20) 21 6 VPN IPv4 prefix (TEMPORARY - expires 2012-01-20) 21 7 VPN IPv6 prefix (TEMPORARY - expires 2012-01-20) 21 8 L2 VPN endpoint (TEMPORARY - expires 2012-01-20) 21 9 "FEC 128" Pseudowire (DEPRECATED) (TEMPORARY - expires 2012-01-20) 21 10 "FEC 128" Pseudowire (TEMPORARY - expires 2012-01-20) 21 11 "FEC 129" Pseudowire (TEMPORARY - expires 2012-01-20) 21 12 BGP labeled IPv4 prefix (TEMPORARY - expires 2012-01-20) 21 13 BGP labeled IPv6 prefix (TEMPORARY - expires 2012-01-20) 21 14 Generic IPv4 prefix (TEMPORARY - expires 2012-01-20) 21 15 Generic IPv6 prefix (TEMPORARY - expires 2012-01-20) 21 16 Nil FEC (TEMPORARY - expires 2012-01-20) 21 17 RSVP P2MP IPv4 Session (TEMPORARY - expires 2012-01-20) 21 18 RSVP P2MP IPv6 Session (TEMPORARY - expires 2012-01-20) 21 19 Multicast P2MP LDP FEC Stack (TEMPORARY - expires 2012-01-20) 22-31743 Unassigned 31744-32767 Reserved for Vendor private use 32768-64511 Unassigned 64512-65535 Reserved for Vendor private use IETF Review 0 Null Timestamp 64 1 Sequence Number 64 2 Network Time Protocol version 4 64-bit Timestamp 64 3 Truncated IEEE 1588v2 PTP Timestamp 64 4-15 Unassigned IETF Review 0x0 In-band Response Requested 0x1 Out-of-band Response Requested 0x2 No Response Requested 0x3-0xFF Unassigned IETF Review Values 0x0-0xF are reserved for non-error response codes; please refer to Section 4.1 of for guidelines. 0x0 Reserved 0x1 Success 0x2 Data Format Invalid 0x3 Initialization in Progress 0x4 Data Reset Occurred 0x5 Resource Temporarily Unavailable 0x6-0xF Unassigned 0x10 Unspecified Error 0x11 Unsupported Version 0x12 Unsupported Control Code 0x13 Unsupported Data Format 0x14 Authentication Failure 0x15 Invalid Destination Node Identifier 0x16 Connection Mismatch 0x17 Unsupported Mandatory TLV Object 0x18 Unsupported Query Interval 0x19 Administrative Block 0x1A Resource Unavailable 0x1B Resource Released 0x1C Invalid Message 0x1D Protocol Error 0x1E-0xFF Unassigned IETF Review Types 0-127 are classified as Mandatory, and Types 128-255 are classified as Optional. 0 Padding - copy in response 1 Return Address 2 Session Query Interval 3 Loopback Request 4-126 Unassigned 127 Experimental use 128 Padding - do not copy in response 129 Destination Address 130 Source Address 131-254 Unassigned 255 Experimental use Standards Action 15 V Flag 14 T Flag 13-0 Unassigned Standards Action 0 Unassigned 1 IPv4 Numbered 16 2 IPv4 Unnumbered 16 3 IPv6 Numbered 40 4 IPv6 Unnumbered 28 5 Non IP 12 6-255 Unassigned