Deployment Guide
Command Modes ROUTER BGP
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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 dierent (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.
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
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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.
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
Command Modes ROUTER BGP
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information The MED is a 4-byte unsigned integer value and the default behavior is to assume a missing MED as 4294967295.
This command causes a missing MED to be treated as 0. During path selection, paths with a lower MED are
preferred over paths with a higher MED.
Border Gateway Protocol IPv4 (BGPv4) 283