An SDP sub-type of the MPLS encapsulation type allows service binding to a SR-TE LSP programmed in TTM by MPLS:
*A:7950 XRS-20# configure service sdp 100 mpls create
— *A:7950 XRS-20>config>service>sdp$ sr-te-lsp lsp-name
The user can specify up to 16 SR-TE LSP names. The destination address of all LSPs must match that of the SDP far-end option. Service data packets are sprayed over the set of LSPs in the SDP using the same procedures as for tunnel selection in ECMP. Each SR-TE LSP can, however, have up to 32 next-hops at the ingress LER when the first segment is a node SID-based SR tunnel. Consequently, service data packets are forwarded over one of a maximum of 16x32 next-hops. The tunnel-far-end option is not supported. In addition, the mixed-lsp-mode option does not support the sr-te tunnel type.
The signaling protocol for the service labels for an SDP using a SR-TE LSP can be configured to static (off), T-LDP (tldp), or BGP (bgp).
An SR-TE LSP can be used in VPRN auto-bind with the following commands:
config>service>vprn>
— auto-bind-tunnel
— resolution {any | disabled | filter}
— resolution-filter
— [no] sr-te
— exit
— exit
Both VPN-IPv4 and VPN-IPv6 (6VPE) are supported in a VPRN service using segment routing transport tunnels with the auto-bind-tunnel command.
This auto-bind-tunnel command is also supported with BGP EVPN service, as shown below:
config>service>vpls>bgp-evpn>mpls>
— auto-bind-tunnel
— resolution {any | disabled | filter}
— resolution-filter
— [no] sr-te
— exit
— exit
The following service contexts are supported with SR-TE LSP:
VLL, LDP VPLS, IES/VPRN spoke-interface, R-VPLS, BGP EVPN
BGP-AD VPLS, BGP-VPLS, BGP VPWS when the use-provisioned-sdp option is enabled in the binding to the PW template
intra-AS BGP VPRN for VPN-IPv4 and VPN-IPv6 prefixes with both auto-bind and explicit SDP
inter-AS options B and C for VPN-IPv4 and VPN-IPv6 VPRN prefix resolution
IPv4 BGP shortcut and IPv4 BGP label route resolution
IPv4 static route resolution
multicast over IES/VPRN spoke interface with spoke SDP riding a SR-TE LSP