[CC'ed Spring WG] I agree with what Chris said below in principle. But all this should not be obviously part of ISIS/IGP extensions WG documents..
Use cases for binding TLVs are explained in great details in 2 key documents (had to shuffle through to get here) - 1. http://tools.ietf.org/html/draft-gredler-rtgwg-igp-label-advertisement-05 2. http://tools.ietf.org/html/draft-gredler-spring-mpls-06 IMO, both are very useful documents. It would be good to combine both of these and publish as a "spring " document and eventually it should progress there. AFAICT, Both ISIS and OSPF should refer the same eventually to get more clarity and use of binding TLVs described currently. -- Uma C. From: Isis-wg [mailto:[email protected]] On Behalf Of Chris Bowers Sent: Thursday, July 31, 2014 2:42 PM To: [email protected] Subject: [Isis-wg] comment on draft-ietf-isis-segment-routing-extensions-02 All, The current text of draft-ietf-isis-segment-routing-extensions-02 does not clearly explain the usage of the Binding TLV for advertising LSPs created using other protocols. I would like to propose the following text to be included as section 2.5 . Thanks, Chris ---------------- 2.5 Binding TLV usage examples This section gives examples of using the Binding TLV to advertise SID/label bindings associated with RSVP-TE, LDP, and BGP labeled-unicast LSPs. It also includes an example of advertising a context-id for egress node protection. All of the examples assume that the Binding TLV weight=1 and metric=100. 2.5.1 Advertising an RSVP-TE LSP using the Binding TLV Assume that R1 has signaled an RSVP-TE LSP to egress router (R4) with router-id=10.4.4.4, with ER0 = (192.1.2.2 [strict], 192.2.3.2 [strict], 192.3.4.2 [strict]). R1 can advertise a locally significant label binding for this LSP (with label value=1099) using the following values and sub-TLVs in the Binding TLV. Binding-TLV: F-bit=0, M-bit=0, weight=1, range=1, prefix length=32, FEC prefix=10.4.4.4 SID/Label Sub-TLV: label=1099 ERO Metric sub-TLV: metric=100 IPv4 ERO sub-TLV: L-bit=0, IPv4 address=192.1.2.2 IPv4 ERO sub-TLV: L-bit=0, IPv4 address=192.2.3.2 IPv4 ERO sub-TLV: L-bit=0, IPv4 address=192.3.4.2 2.5.2 Advertising an LDP LSP using the Binding TLV Assume that R5 has learned a FEC-label binding via LDP for FEC=10.8.8.8/32. R5 can advertise a locally significant label binding for this LSP (with label value=5099) using the following values and sub-TLVs in the Binding TLV. Binding TLV: F-bit=0, M-bit=0, weight=1, range=1, prefix length=32, FEC prefix=10.8.8.8 SID/Label Sub-TLV: label=5099 ERO Metric sub-TLV: metric=100 IPv4 ERO sub-TLV: L-bit=1, IPv4 address=10.8.8.8 2.5.3 Advertising a BGP labeled-unicast LSP using the Binding TLV Assume that R9 has used BGP labeled-unicast to learn a label binding for prefix 10.15.15.15/32 with BGP next-hop=10.12.12.12. R9 can advertise a locally significant label binding for this LSP (with label value=7099) using the following values and sub-TLVs in the Binding TLV. Binding-TLV: F-bit=0, M-bit=0, weight=1, range=1, prefix length=32, FEC prefix=10.15.15.15 SID/Label Sub-TLV: label=7099 ERO Metric sub-TLV: metric=100 IPv4 ERO sub-TLV: L-bit=1, IPv4 address=10.12.12.12 2.5.4 Advertising a context-id for egress node protection using the Binding TLV Assume that R22 is configured in the protector role to provide egress node protection for R21 using context-id=10.0.0.21. R22 can advertise the label associated with this context-id (with label value=8099) using the following values and sub-TLVs in the Binding TLV. Binding TLV: F-bit=0, M-bit=1, weight=1, range=1, prefix length=32, FEC prefix=10.0.0.21 SID/Label Sub-TLV: label=8099 ----------------
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