SRv6 network programming in IS-IS

You can configure segment routing in a core IPv6 network without an MPLS data plane. This feature is useful for service providers whose networks are predominantly IPv6 and have not deployed MPLS. Such networks depend only on the IPv6 headers and header extensions for transmitting data. This feature also benefits networks that need to deploy segment routing traffic through transit routers that do not have segment routing capability yet. In such networks, the SRv6 network programming feature can provide flexibility to leverage segment routing without deploying MPLS. To enable SRv6 network programming in an IPv6 domain, include the srv6 statement at the [edit protocols isis source-packet-routing] hierarchy level. To advertise the Segment Routing Header (SRH) locator with a mapped flexible algorithm, include the algorithm statement at the [edit protocols isis source-packet-routing srv6 locator] hierarchy level. To configure a topology-independent loop-free alternate backup path for SRv6 in an IS-IS network, include the transit-srh-insert statement at the [edit routing-options source-packet-routing srv6] hierarchy level.