Validate BGP in multipath scenario

TESTBED_DUT_ATE_4LINKS

• Connect DUT port 1, 2, 3 and 4 to ATE port 1, 2, 3 and 4 respectively
• Configure IPv4/IPv6 addresses on the interfaces
• Establish eBGP sessions between:
  • ATE port-1 and DUT port-1
  • ATE port-2 and DUT port-2
  • ATE port-3 and DUT port-3
  • ATE port-4 and DUT port-4
• Enable an Accept-route all import-policy/export-policy for eBGP session under the neighbor AFI/SAFI
• Create an IPv4 internal target network attached to ATE port 2, 3 and 4

• RT-1.51.1: Verify best path

  • Configure ATE devices(ports) on same AS
  • Advertise equal cost paths from 3 interfaces of ATE of same AS
  • Check entries in FIB for advertised prefix, it should only have 1 entry
    • /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops
  • Initiate traffic from ATE port-1 to the DUT and destined to internal target network
  • Check entire traffic should only be forwarded by one of DUT port2, port3 or port4

• RT-1.51.2: Enforcing multipath hence ECMP scope to only one peer AS

  • Configure ATE devices(ports) on same AS
  • Enable multipath and set maximum-paths limit to 2
    • /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/use-multiple-paths/config/enabled
    • /network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/use-multiple-paths/ebgp/config/maximum-paths
  • Advertise equal cost paths from 3 interfaces of ATE of same AS
  • Check entries in FIB for advertised prefix, it should only have 2 entries
    • /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops
  • Initiate traffic from ATE port-1 to the DUT and destined to internal target network
  • Check entire traffic should only be equally forwarded by any two among DUT port2, port3 or port4

• RT-1.51.3: Verify use of allow-multiple-as for ECMP routing across different peer AS

  • Configure ATE devices(ports) on different AS
  • Enable multipath, set maximum-paths limit to 2 and enable allow multiple AS
    • /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/use-multiple-paths/config/enabled
    • /network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/use-multiple-paths/ebgp/config/allow-multiple-as
    • /network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/use-multiple-paths/ebgp/config/maximum-paths
  • Advertise equal cost paths from 3 interfaces of ATE of different AS
  • Check entries in FIB for advertised prefix, it should only have 2 entries
    • /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops
  • Initiate traffic from ATE port-1 to the DUT and destined to internal target network
  • Check entire traffic should only be equally forwarded by any two among DUT port2, port3 or port4

• /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/use-multiple-paths/config/enabled
• /network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/use-multiple-paths/ebgp/config/allow-multiple-as
• /network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/use-multiple-paths/ebgp/config/maximum-paths

• /network-instances/network-instance/afts/ipv4-unicast/ipv4-entry/state
• /network-instances/network-instance/afts/ipv4-unicast/ipv4-entry/state/next-hop-group
• /network-instances/network-instance/afts/next-hop-groups/next-hop-group[id=]/state
• /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops

rpcs:
  gnmi:
    gNMI.Get:
    gNMI.Subscribe:

• FFF - Fixed Form Factor