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BGP and BGP4+ Commands
Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
C613-50032-01 REV D AlliedWare Plus
TM
Operating System - Software Version 5.4.3-2.6 3.17
bgp bestpath med (BGP and BGP4+)
This command controls how the Multi Exit Discriminator (MED) attribute comparison is
performed.
Use the no variant of this command to prevent BGP from considering the MED attribute
when comparing paths.
Syntax bgp bestpath med {[confed] [missing-as-worst]}
Mode
Router Configuration
Usage The confed parameter enables MED comparison among paths learned from
confederation peers. The MED attributes are compared only if there is no external AS
(Autonomous System), where an external AS is one that is not within the confederation. If
there is an external AS in the path, then the MED comparison is not made.
For example, in the following paths the MED value is not compared with Path3 since it is
not in the confederation. MED is compared for Path1 and Path2 only.
Path1 = 32000 32004, med=4
Path2 = 32001 32004, med=2
Path3 = 32003 1, med=1
The effect of the missing-as-worst parameter is to treat a missing MED attribute in a path
as having a value of infinity, making the path without a MED value the least desirable path.
If the missing-as-worst parameter is not configured, the missing MED attribute is
assigned the value of 0, making the path with the missing MED attribute the best path.
Examples
Related Commands
bgp always-compare-med (BGP and BGP4+)
bgp bestpath as-path ignore (BGP and BGP4+)
bgp deterministic-med (BGP and BGP4+)
Parameter Description
confed
Compares MED among confederation paths.
missing-as-worst
Treats missing MED as the least preferred one.
awplus#
configure terminal
awplus(config)#
router bgp 100
awplus(config-router)#
bgp bestpath med missing-as-worst
awplus#
configure terminal
awplus(config)#
router bgp 100
awplus(config-router)#
bgp bestpath med confed
awplus#
configure terminal
awplus(config)#
router bgp 100
awplus(config-router)#
bgp bestpath med confed missing-as-worst