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bgpd already supports BGP Prefix-SID path attribute and
there are some sub-types of Prefix-SID path attribute.
This commits makes bgpd to support additional sub-types.
sub-Type-4 and sub-Type-5 for construct the VPNv4 SRv6 backend
with vpnv4-unicast address family.
This path attributes is already supported by Ciscos IOS-XR and NX-OS.
Prefix-SID sub-Type-4 and sub-Type-5 is defined on following
IETF-drafts.
Supports(A-part-of):
- https://tools.ietf.org/html/draft-dawra-idr-srv6-vpn-04
- https://tools.ietf.org/html/draft-dawra-idr-srv6-vpn-05
Signed-off-by: Hiroki Shirokura <slank.dev@gmail.com>
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