Doc: Fix documentation for "next hop prefer"

diff --git a/doc/bird.sgml b/doc/bird.sgml
index 76943fe727729098bb24c51fcd5313e95552a29d..fc9040b1a520f0f564af69634a4d66bb161f04a1 100644 (file)
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -3682,19 +3682,23 @@ be used in explicit configuration.
        BGP session (if acceptable), or the preferred address of an associated
        interface.
 
-       <tag><label id="bgp-next-hop-prefer">next hop prefer global</tag>
-       Prefer global IPv6 address to link-local IPv6 address for immediate next
-       hops of received routes. For IPv6 routes, the Next Hop attribute may
-       contain both a global IP address and a link-local IP address. For IBGP
-       sessions, the global IP address is resolved (<ref id="bgp-gateway"
-       name="gateway recursive">) through an IGP routing table
-       (<ref id="bgp-igp-table" name="igp table">) to get an immediate next
-       hop. If the resulting IGP route is a direct route (i.e., the next hop is
-       a direct neighbor), then the link-local IP address from the Next Hop
-       attribute is used as the immediate next hop. This option change it to
-       use the global IP address instead. Note that even with this option
-       enabled a route may end with a link-local immediate next hop when the
-       IGP route has one. Default: disabled.
+       <tag><label id="bgp-next-hop-prefer">next hop prefer global|local</tag>
+       For IPv6 routes, the Next Hop attribute may contain both a global IP
+       address and a link-local IP address. For IBGP sessions, the global IP
+       address is resolved (<ref id="bgp-gateway" name="gateway recursive">)
+       through an IGP routing table (<ref id="bgp-igp-table" name="igp table">)
+       to get an immediate next hop. If the resulting IGP route is a direct
+       route (i.e., the next hop is a direct neighbor), then the link-local
+       IP address from the Next Hop attribute is used as the immediate next hop.
+       This option changes it to prefer global or link-local IP address,
+       respectively. Note that even with this option set to global, route may
+       end with a link-local immediate next hop when the IGP route has one.
+
+       When set to <cf/local/, prefer link-local IPv6 addresses over global
+       addresses for immediate next hops of received routes. When set to
+       <cf/global/, prefer global IPv6 address to link-local IPv6 address for
+       immediate next hops of received routes. Default: global in direct mode
+       (EBGP), local in recursive mode (IBGP).
 
        <tag><label id="bgp-link-local-next-hop-format">link local next hop format native|single|double</tag>
        For IPv6 routes, BGP assumes that the Next Hop attribute contains a