Configuring Traffic Steering into a Flex-Algo-based SR-MPLS BE Tunnel

The traffic steering configuration allows you to recurse routes to Flex-Algo-based SR-MPLS BE tunnels (also called Flex-Algo LSPs) for traffic forwarding.

Context

After a Flex-Algo LSP is configured, traffic needs to be steered into the LSP for forwarding. Currently, Flex-Algo LSPs can be used for various routes, such as BGP and static routes, as well as various services, such as BGP L3VPN, BGP4+ 6PE, and EVPN services. This section describes how to use tunnel policies to recurse a service to a Flex-Algo LSP.

Pre-configuration Tasks

Before configuring traffic steering, complete the following tasks:

Configure BGP routes, static routes, BGP4+ 6PE services, BGP L3VPN services, BGP L3VPNv6 services, or EVPN services correctly.
Configure an IP prefix list and a tunnel policy to limit the number of routes that can recurse to a Flex-Algo LSP.

Procedure

Configure a tunnel policy.
1. Run system-view
  The system view is displayed.
2. Run tunnel-policy policy-name
  A tunnel policy is created, and the tunnel policy view is displayed.
3. (Optional) Run description description-information
  A description is configured for the tunnel policy.
4. Run tunnel select-seq flex-algo-lsp load-balance-number load-balance-number [ unmix ]
  The tunnel selection sequence and number of tunnels for load balancing are configured.
5. Run commit
  The configuration is committed.
6. Run quit
  Exit the tunnel policy view.
Configure services to recurse to Flex-Algo LSPs.
- Configure non-labeled public BGP routes to recurse to Flex-Algo LSPs.
  
  For details about how to configure BGP, see Configuring Basic BGP Functions.
  1. Run route recursive-lookup tunnel [ ip-prefix ip-prefix-name ] tunnel-policy policy-name
    
    Non-labeled public BGP routes are configured to recurse to Flex-Algo LSPs.
  2. Run commit
    
    The configuration is committed.
- Configure static routes to recurse to Flex-Algo LSPs.
  
  For details about how to configure a static route, see Configuring IPv4 Static Routes.
  1. Run ip route-static recursive-lookup tunnel [ ip-prefix ip-prefix-name ] tunnel-policy policy-name
    
    Static routes are configured to recurse to Flex-Algo LSPs for MPLS forwarding.
  2. Run commit
    
    The configuration is committed.
- Configure a BGP L3VPN service to recurse to a Flex-Algo LSP.
  
  For details about how to configure a BGP L3VPN service, see Configuring a Basic BGP/MPLS IP VPN.
  1. Run ip vpn-instance vpn-instance-name
    The VPN instance view is displayed.
  2. Run ipv4-family
    The VPN instance IPv4 address family view is displayed.
  3. Run tnl-policy policy-name
    A tunnel policy is applied to the VPN instance IPv4 address family.
  4. (Optional) Run default-color color-value
    The default color is specified for the L3VPN service to recurse to a Flex-Algo LSP. This color is used for recursion if a remote VPN route without the color extended community attribute is leaked to the local VPN instance.
  5. Run commit
    
    The configuration is committed.
- Configure a BGP L3VPNv6 service to recurse to a Flex-Algo LSP.
  
  For details about how to configure a BGP L3VPNv6 service, see Configuring a Basic BGP/MPLS IPv6 VPN.
  1. Run ip vpn-instance vpn-instance-name
    The VPN instance view is displayed.
  2. Run ipv6-family
    The VPN instance IPv6 address family view is displayed.
  3. Run tnl-policy policy-name
    A tunnel policy is applied to the VPN instance IPv6 address family.
  4. (Optional) Run default-color color-value
    The default color is specified for the L3VPNv6 service to recurse to a Flex-Algo LSP. This color is used for recursion if a remote VPN route without the color extended community attribute is leaked to the local VPN instance.
  5. Run commit
    
    The configuration is committed.
- Configure a BGP4+ 6PE service to recurse to a Flex-Algo LSP.
  
  For details about how to configure a BGP4+ 6PE service, see Configuring BGP4+ 6PE.
  1. Run bgp { as-number-plain | as-number-dot }
    The BGP view is displayed.
  2. Run ipv6-family unicast
    The BGP-IPv6 unicast address family view is displayed.
  3. Run peer ipv4-address enable
    The local device is enabled to exchange routes with a specified 6PE peer in the address family view.
  4. Run peer ipv4-address tnl-policy tnl-policy-name
    A tunnel policy is applied to the 6PE peer.
  5. Run commit
    
    The configuration is committed.
- Configure an EVPN service to recurse to a Flex-Algo LSP.
  
  For details about how to configure an EVPN service, see Configuring BD-EVPN Functions.
  To apply a tunnel policy to an EVPN L3VPN instance, perform the following steps:
  1. Run ip vpn-instance vpn-instance-name
    The VPN instance view is displayed.
  2. Run ipv4-family or ipv6-family
    The VPN instance IPv4 or IPv6 address family view is displayed.
  3. Run tnl-policy policy-name evpn
    A tunnel policy is applied to the EVPN L3VPN instance.
  4. (Optional) Run default-color color-value evpn
    The default color is specified for the EVPN L3VPN service to recurse to a Flex-Algo LSP.
    
    This color is used for recursion if a remote EVPN route without the color extended community attribute is leaked to the local VPN instance.
  5. Run commit
    
    The configuration is committed.
  To apply a tunnel policy to a BD EVPN instance, perform the following steps:
  1. Run evpn vpn-instance vpn-instance-name bd-mode
    
    The BD EVPN instance view is displayed.
  2. Run tnl-policy policy-name
    
    A tunnel policy is applied to the BD EVPN instance.
  3. (Optional) Run default-color color-value
    The default color is specified for the EVPN service to recurse to a Flex-Algo LSP. This color is used for recursion if a remote EVPN route without the color extended community attribute is leaked to the local EVPN instance.
  4. Run commit
    
    The configuration is committed.
  To apply a tunnel policy to an EVPN instance in EVPN VPWS mode, perform the following steps:
  1. Run evpn vpn-instance vpn-instance-name vpws
    
    The view of the EVPN instance in EVPN VPWS mode is displayed.
  2. Run tnl-policy policy-name
    
    A tunnel policy is applied to the EVPN instance in EVPN VPWS mode.
  3. (Optional) Run default-color color-value
    The default color is specified for the EVPN service to recurse to a Flex-Algo LSP. This color is used for recursion if a remote EVPN route without the color extended community attribute is leaked to the local EVPN instance.
  4. Run commit
    
    The configuration is committed.
  To apply a tunnel policy to a basic EVPN instance, perform the following steps:
  1. Run evpn vpn-instance vpn-instance-name
    
    The EVPN instance view is displayed.
  2. Run tnl-policy policy-name
    
    A tunnel policy is applied to the basic EVPN instance.
  3. Run commit
    
    The configuration is committed.