Reference Guide

Version 8.3.11.4 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Usage
Information
The bestpath router bgp configuration mode command changes the default
bestpath selection algorithm. The multipath-relax option allows load-sharing across
providers with different (but equal-length) autonomous system paths. Without this option,
ECMP expects the AS paths to be identical for load-sharing.
bgp bestpath med confed
Enable MULTI_EXIT_DISC (MED) attribute comparison on paths learned from BGP confederations.
S8420T
Syntax
bgp bestpath med confed
To disable MED comparison on BGP confederation paths, enter the no bgp bestpath
med confed command.
Defaults Disabled
Command Modes ROUTER BGP
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 7.8.1.0 Introduced on the S-Series.
Version 7.7.1.0 Introduced on the C-Series.
Usage
Information
The software compares the MEDs only if the path contains no external autonomous system
numbers. If you enable this command, use the clear ip bgp * command to recompute
the best path.
bgp bestpath med missing-as-best
During path selection, indicate preference to paths with missing MED (MULTI_EXIT_DISC) over paths with an advertised
MED attribute.
S4820T
Syntax
bgp bestpath med missing-as-best
To return to the default selection, use the no bgp bestpath med missing-as-best
command.
Defaults Disabled
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