527
1
．
Select the route with the most weight first;
2. If the weights are the same, select the route with the most local preference;
3. If the local preferences are the same, select the route generated by local switch.
4. If the local preferences are the same and there is no route generated by local
switch, select the route with the shortest AS path;
5. If the AS paths are the same, select the route with the lowest “origin“ type
（
IGP<EGP<INCOMPLETE
）
;
6. If the “origin” types are the same, select the route with the lowest MED attribute.
Unless activating command “bgp always-compare-med”, this comparison is only available
among the routes from the same neighbor AS.
7. If the MED attributes are the same, EBGP is preferable to outer confederation and
outer confederation is preferable to IBGP.
8. If it’s still the same by now, BGP router ID
（
router ID
）
is used to break the balance.
The best route is the one from the least router ID.
14.8.2 BGP Configuration Task List
The BGP configuration tasks include basic and advanced tasks. Basic BGP
configuration tasks include the following:
1
．
Enable BGP Routing (required)
2
．
Configure BGP Neighbors (required)
3
．
Administrate the change of routing policy
4
．
Configure BGP Weights
5
．
Configure BGP Route Filtering policy basing on Neighbors
6
．
Configure Next-Hop of BGP
7
．
Configure Multi-Hop of EGBP
8
．
Configure BGP Session Identifier
9
．
Configure BGP Version
Advanced BGP configuration tasks include the following:
1
．
Use Route Maps to Modify Route
2
．
Configure Route Aggregation
3
．
Configure BGP Community Filtering
4
．
Configure BGP Confederation
5
．
Configure a Route Reflector
6
．
Configure Peer Groups
7
．
Configure Neighbors and Peer Groups’ Parameters
8
．
Adjust BGP Timers
