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MergedTable takes two routing tables and combines them together to form a single table, where routes for the same subnet with a lower admin distance override those with a higher admin distance.
The two parent tables are not actually merged.
An add_route request from a parent tables causes a lookup on the other parent table. If the route is better than the one from the other table, or no route exists in the other table, then the new route is passed downstream.
An delete_route request from a parent table also causes a lookup on the other parent table. The delete_route is propagated downstream. If an alternative route is found, then that is then propagated downsteam as an add_route to replace the deleted route.
Lookups from downsteam cause lookups on both parent tables. The better response is given.
| MergedTable (RouteTable<A>* table_a, RouteTable<A>* table_b)
| MergedTable |
MergedTable Constructor.
Parameters:
| table_a | one of two parent RouteTables. |
| table_b | one of two parent RouteTables. |
| int add_route (const IPRouteEntry<A>& route,
RouteTable<A>* caller)
| add_route |
An add_route request from a parent table causes a lookup on the other parent table. If the route is better than the one from the other table, or no route exists in the other table then it is passed downstream.
Parameters:
| route | the new route. |
| caller | the parent table sending the new route. |
Returns: XORP_OK on success, otherwise XORP_ERROR.
Reimplemented from RouteTable.
| int delete_route (const IPRouteEntry<A>* route,
RouteTable<A>* caller)
| delete_route |
An delete_route request from a parent table also causes a lookup on the other parent table. The delete_route is propagated downstream. If an alternative route is found, then that is then propagated downsteam as an add_route to replace the deleted route.
Parameters:
| route | the route to be deleted. |
| caller | the parent table sending the delete_route. |
Returns: XORP_OK on success, otherwise XORP_ERROR.
Reimplemented from RouteTable.
| const IPRouteEntry<A>* lookup_route (const IPNet<A>& net)
| lookup_route |
[const]
Lookup a specific subnet. The lookup will be sent to both parent tables. If both give an answer, then the route with the better admin_distance is returned.
Parameters:
| net | the subnet to look up. |
Returns: a pointer to the route entry if it exists, NULL otherwise.
Reimplemented from RouteTable.
| const IPRouteEntry<A>* lookup_route (const A& addr)
| lookup_route |
[const]
Lookup an IP address to get the most specific (longest prefix length) route that matches this address. The lookup will be sent to both parent tables. If both give an answer, then the more specific route is returned. If both routes have the same prefix length, then the route with the better admin_distance is returned.
Parameters:
| addr | the IP address to look up. |
Returns: a pointer to the best most specific route entry if any entry matches, NULL otherwise.
Reimplemented from RouteTable.
| RouteRange<A>* lookup_route_range (const A& addr)
| lookup_route_range |
[const]
Lookup an IP address to get the most specific (longest prefix length) route that matches this address, along with the RouteRange information for this address and route. As with lookup_route, this involves querying both parent tables. The best, most specific route is returned, and the tightest bounds on the answer are returned.
Parameters:
| addr | the IP address to look up. |
Returns: a pointer to a RouteRange class instance containing the relevant answer. It is up to the recipient of this pointer to free the associated memory.
See also: RouteRange
Reimplemented from RouteTable.
| TableType type ()
| type |
[const]
Returns: the table type (TableType).
Reimplemented from RouteTable.
| void replumb (RouteTable<A>* old_parent, RouteTable<A>* new_parent)
| replumb |
replumb the parent tables, so that new_parent replaces old_parent.
Parameters:
| old_parent | the old parent table. |
| new_parent | the new parent table. |
Reimplemented from RouteTable.
| string str ()
| str |
[const]
Render this MergedTable as a string for debugging purposes.
Reimplemented from RouteTable.
