SR-MPLS and SRv6 are segment routing technologies where the source node encodes the path as a list of Segment IDs (SIDs) in packet headers—MPLS labels for SR-MPLS and IPv6 headers for SRv6. These SIDs guide packets through the network along paths computed by the IGP. Using Cisco Crosswork Network Controller (CNC), users can visualize and manage SR-MPLS and SRv6 policies, including creating, modifying, and monitoring traffic engineering paths, simplifying network operations and enhancing traffic engineering control.
SR-MPLS and SRv6
This section explains SR-MPLS (Segment Routing with MPLS) and SRv6 (Segment Routing with IPv6), two segment routing technologies that control path selection in modern IP/MPLS networks.
SR-MPLS and SRv6 policies on the topology map
This section provides an overview of the Traffic Engineering user interface in Crosswork Network Controller, and how it enables viewing and managing SR-MPLS and SRv6 policies on the topology map.
View SR-MPLS and SRv6 policy details
Use this procedure to view detailed information about SR-MPLS and SRv6 policies, including candidate paths, segment lists, and path computation constraints configured per candidate path.
View IGP path and metrics
Learn how to view IGP paths and their associated metrics for SR-MPLS or SRv6 policies.
Find Multiple Candidate Paths (MCPs)
Use this procedure to visualize multiple candidate paths on the topology map.
View underlying paths associated with a Binding-Segment ID (B-SID) label
Use this procedure to view and analyze the network paths associated with a B-SID (Binding-Segment ID) label for SR-MPLS or SRv6 policies.
SR policies with multiple segment lists
This section explains SR policies with multiple segment lists (MSL), including their benefits, operational limitations, and a comparison with traditional parallel policies.
Native SR paths
This section provides an overview of native SR paths that use the network’s native IGP with segment routing extensions to forward traffic. It also outlines the device prerequisites required for successful visualization of these paths and describes the steps to create path queries and view native SR IGP paths on the topology map.
Configure TE link affinities
Use this procedure to map device affinity names to TE link affinity bits, providing consistent link attribute definitions across your network.
Policy deployment considerations
This section provides key considerations to review before deploying policies, including timeout recommendations and affinity mapping. Reviewing these factors helps ensure smooth policy provisioning and optimal visualization in your network.
Create explicit SR-MPLS policies
Learn how to create explicit SR-MPLS policies using a fixed path consisting of a list of segment IDs (SIDs).
Create dynamic SR-MPLS policies based on optimization intent
Use this task to create dynamic SR-MPLS policies that optimize network traffic paths according to user-defined metrics and constraints.
Create SR-TE policies (PCC-initiated)
Use this procedure to create explicit or dynamic SR-MPLS or SRv6 segment routing traffic engineering policies.
Modify SR-MPLS policies
Use this procedure to modify or delete SR-MPLS policies that were created using the Crosswork Network Controller API or UI.
Create an ODN template
Learn how to create an On-Demand Next-hop (ODN) template to automate the dynamic provisioning of traffic-engineered paths in SR-TE environments.