| Internet-Draft | Indirection-id Redirect for SRv6 | July 2022 |
| Van de Velde, et al. | Expires 12 January 2023 | [Page] |
This document defines extensions to "FlowSpec Redirect to indirection-id Extended Community" for SRv6. This extended community can trigger advanced redirection capabilities to flowspec clients for SRv6. When activated, this flowspec extended community is used by a flowspec client to retrieve the corresponding next-hop and encoding information within a localised indirection-id mapping table.¶
The functionality detailed in this document allows a network controller to decouple the BGP flowspec redirection instruction from the operation of the available paths.¶
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [2].¶
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"FlowSpec Redirect to indirection-id Extended Community" for IPv4 is defined in ietf-idr-flowspec-path-redirect [1]. This draft specifies extensions to this community for SRv6.¶
This document defines a new sub-type value for SRv6 in "FlowSpec Redirect to indirection-id Extended Community". The format of this extended community with the new sub-type value is show below:¶
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type |Sub-Type (TBD) | Flags(1 octet)| ID-Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Generalized indirection_id (16 octets) | ~ ~ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+¶
Where¶
Type: 1 octet, defined in ietf-idr-flowspec-path-redirect [1].¶
Sub-Type: 1 octet, its value (TBD) will be assigned by IANA.¶
Flags: Same as that defined in ietf-idr-flowspec-path-redirect [1].¶
ID-Type: 1 octet value. This draft defines following Context Types:¶
Generalized indirection_id: 128-bit identifier used as indirection_id¶
A system using "Redirect to indirection-id" extended community can cause during the redirect mitigation of a DDoS attack overflow of traffic received by the mitigation infrastructure.¶
This document received valuable comments and input from IDR working group including Adam Simpson, Mustapha Aissaoui, Jan Mertens, Robert Raszuk, Jeff Haas, Susan Hares and Lucy Yong.¶
Below is a list of other contributing authors in alphabetical order:¶
Arjun Sreekantiah Cisco Systems 170 W. Tasman Drive San Jose, CA 95134 USA Email: asreekan@cisco.com Nan Wu Huawei Technologies Huawei Bld., No. 156 Beiquing Rd Beijing 100095 China Email: eric.wu@huawei.com Shunwan Zhuang Huawei Technologies Huawei Bld., No. 156 Beiquing Rd Beijing 100095 China Email: zhuangshunwan@huawei.com¶
Wim Henderickx Nokia Antwerp BE Email: wim.henderickx@nokia.com¶
This document requests a new sub-type value under "FlowSpec Redirect to indirection-id Extended Community Sub-Type" registery.¶
Value Code Reference 0x01 Flowspec Redirect to 128-bit Path-id for SRv6 [RFC-To-Be]¶