Handle routes using link local nexthop #1680
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hi @saiarcot895 , please help with review and merge. thanks! |
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why
When we add a route, the current code doesn't provide interface to vl_api_ip_route_add_del but only provides nexthop address. It works with if the nexthop address is unique. However, in link-local case, the nexthop address is not unique and only valid with the egress interface. vpp fails to find the correct nexthop and interface.
what this PR does
SAI provides SAI_NEXT_HOP_ATTR_ROUTER_INTERFACE_ID. We can get the egress interface from this attribute and provide it to vpp in the vl_api_ip_route_add_del. This removes the ambiguity in the link-local case.