bestpath (BGP)
To change the default best-path selection algorithm, use the bestpath command. To return the Border Gateway Protocol (BGP) routing process to the default operation, use the no form of this command.
bestpath {always-compare-med | compare-routerid | {med {missing-as-worst | non-deterministic}}
no bestpath {always-compare-med | compare-routerid | {med {missing-as-worst | non-deterministic}}
Syntax Description
always-compare-med |
Compares the Multi-Exit Discriminator (MED) on paths from a different autonomous system (AS). |
compare-routerid |
Configures a Border Gateway Protocol (BGP) routing process to compare identical routes received from different external peers during the best path selection process and to select the route with the lowest router ID as the best path. |
med missing-as-worst |
Assigns the value of infinity to received routes that do not carry the MED attribute, making these routes the least desirable. |
med non-deterministic |
Specifies that the best-MED path among paths is not picked from the same AS. |
Command Default
The default settings are as follows:
med missing-as-worst: A value of 0 is assigned to the missing MED
med non-deterministic: Disabled
Command Modes
Router BGP configuration mode
Command History
|
|
6.0(2)N1(1) |
This command was introduced. |
Usage Guidelines
Before you use this command, ensure that BGP is enabled on the switch by using the feature bgp command.
To enable the comparison of the MED for paths from neighbors in different autonomous systems, use the bgp always-compare-med command.
This command requires the LAN Enterprise Services license.
Examples
This example shows how to change the default best-path selection algorithm to compare the MED on paths from different autonomous systems:
switch(config)# router bgp 64496
switch(config-router)# bestpath always-compare-med
Related Commands
|
|
feature bgp |
Enables BGP globally. |
show ip bgp |
Displays information about BGP routes. |