Add next-hop-unchanged for BGP

[dplore]

Change Scope

By default BGP changes the next hop of a BGP route to itself when advertising to neighbors. .../afi-safis/afi-safi/.../config/next-hop-unchanged is added to disable this behavior.

This feature is commonly used in combination with BGP based VPN's (RFC4364).

The full paths added are:

/network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/ipv4-unicast/config/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/ipv4-unicast/state/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/ipv6-unicast/config/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/global/afi-safis/afi-safi/ipv6-unicast/state/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/ipv4-unicast/config/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/ipv4-unicast/state/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/ipv6-unicast/config/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/ipv6-unicast/state/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/ipv4-unicast/config/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/ipv4-unicast/state/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/ipv6-unicast/config/next-hop-unchanged
/network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/ipv6-unicast/state/next-hop-unchanged

This change is backwards compatible.

Platform Implementations

• Cisco IOS XR
• JunOS no-nexthop-change. Note, this is implemented only at a hierarchy of eBGP
• Nokia SRLinux next-hop-unchanged
• Nvidia next-hop-unchanged: