Cisco NCS 5500 Series Configuration Manuals page 215

Implementing Static Routes
Recursive Static Routes
This static route is not inserted into the IPv6 routing table because it is self-recursive. The next hop of the
static route, 2001:0DB8:3000:1, resolves through the BGP route 2001:0DB8:3000:0/16, which is itself a
recursive route (that is, it only specifies a next hop). The next hop of the BGP route, 2001:0DB8::0104,
resolves through the static route. Therefore, the static route would be used to resolve its own next hop.
It is not normally useful to manually configure a self-recursive static route, although it is not prohibited.
However, a recursive static route that has been inserted in the routing table may become self-recursive as a
result of some transient change in the network learned through a dynamic routing protocol. If this occurs, the
fact that the static route has become self-recursive will be detected and it will be removed from the routing
table, although not from the configuration. A subsequent network change may cause the static route to no
longer be self-recursive, in which case it is re-inserted in the routing table.
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
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