bgpd: When advertising a multipath route, the attribute set to be
advertised is based on the bestpath attribute set, but the
following attributes are aggregated from the attribute sets
of the multipath constituents:
- AS_PATH
- ORIGIN
- COMMUNITIES
- EXTENDED COMMUNITIES
In addition the route is advertised with the NEXT_HOP set
to the router's interface IP address, instead of the NEXT_HOP
of the best path. This is to ensure that traffic will go to this
router so it can be fanned out via the multipath route.
* bgpd/ecommunity.c
* ecommunity_uniq_sort(): Make this function externally accessible
* bgpd/ecommunity.h
* Add external declaration for ecommunity_uniq_sort()
* bgpd/bgp_mpath.c
* bgp_info_nexthop_cmp(): Replace calls to bgp_attr_extra_get()
to avoid unwanted memory allocation
* bgp_info_mpath_free(): Free aggregate attribute for multipath
* bgp_info_mpath_attr(): Lookup aggregate attribute of a multipath route
* bgp_info_mpath_attr_set(): Set aggregate attribute of a multipath route
* bgp_info_mpath_aggregate_update(): Update the aggregate attribute
of a multipath route
* bgpd/bgp_mpath.h
* bgp_info_mpath: Add pointer to hold aggregate attribute of a multipath
* Add external declarations for new functions
* bgpd/bgp_route.c
* bgp_announce_check(): Use aggregate attribute when announcing multipath
route
* bgp_announce_check_rsclient(): Use aggregate attribute when announcing
multipath route
* bgp_best_selection(): After updating multipath set, update the
multipath aggregate attribute
diff --git a/bgpd/bgp_mpath.h b/bgpd/bgp_mpath.h
index 3712493..37b9ac8 100644
--- a/bgpd/bgp_mpath.h
+++ b/bgpd/bgp_mpath.h
@@ -43,6 +43,9 @@
/* When attached to best path, the number of selected multipaths */
u_int32_t mp_count;
+
+ /* Aggregated attribute for advertising multipath route */
+ struct attr *mp_attr;
};
/* Functions to support maximum-paths configuration */
@@ -59,6 +62,8 @@
extern void bgp_info_mpath_update (struct bgp_node *, struct bgp_info *,
struct bgp_info *, struct list *,
struct bgp_maxpaths_cfg *);
+extern void bgp_info_mpath_aggregate_update (struct bgp_info *,
+ struct bgp_info *);
/* Unlink and free multipath information associated with a bgp_info */
extern void bgp_info_mpath_dequeue (struct bgp_info *);
@@ -70,5 +75,6 @@
/* Accessors for multipath information */
extern u_int32_t bgp_info_mpath_count (struct bgp_info *);
+extern struct attr *bgp_info_mpath_attr (struct bgp_info *);
#endif /* _QUAGGA_BGP_MPATH_H */