D-Link DXS-3600-16S Manual page 77

7-7 bgp bestpath as-path ignore
This command is used to not consider the as-path factor in selection of the best path. Use the no form of this command
to restore default behavior and configure BGP to consider the AS-path during route selection.
bgp bestpath as-path ignore
no bgp bestpath as-path ignore
Parameters
Default
Command Mode
Command Default Level
Usage Guideline
Example
DXS-3600-32S#configure terminal
DXS-3600-32S(config)#router bgp 65534
DXS-3600-32S(config-router)#bgp bestpath as-path ignore
DXS-3600-32S(config-router)#
7-8 bgp bestpath compare-confed-aspath
This command is used to configure a BGP routing process to compare the confederation AS path length of the routes
received. To return the BGP routing process to the default operation, use the no form of this command.
bgp bestpath compare-confed-aspath
no bgp bestpath compare-confed-aspath
Parameters
Default
Command Mode
Command Default Level
DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide
None.
AS path is considered when the best path selects.
Router Configuration.
Level: 8. (EI Mode Only Command)
The following are the best path selection rules.
• If the next hop associated with the route is unreachable, then the route is dropped.
• Then route with the largest weight is selected.
• If weight cannot determine, then the largest LOCAL-PREF is used to determine
the preferred route.
• If still cannot determine the preferred route, then the route with the shortest AS-
PATH list is preferred.
• If still cannot determine the preferred route, then lowest origin type is preferred.
• If still cannot determine the preferred route, then the lowest MED is preferred.
• If still cannot determine the preferred route, eBGP is preferred over iBGP paths.
• Prefer the path with the lowest IGP metric to the BGP next hop.
• Determine if multiple paths require installation in the routing table for BGP
Multipath.
• When both paths are external, prefer the path that was received first (the oldest
one).
• Prefer the route that comes from the BGP router with the lowest router ID.
• If the originator or router ID is the same for multiple paths, prefer the path with the
minimum cluster list length.
• Prefer the path that comes from the lowest neighbor address.
You can use the commands, bgp bestpath as-path ignore, bgp bestpath
compare-router-id or bgp default local-preference to customize the path selection
process.
You can verify your settings by entering show ip bgp parameters command.
This example shows how to configure the switch to ignore the AS-PATH for the best
path for the autonomous system 65534.
None.
By default, this option is disabled.
Router Configuration.
Level: 8. (EI Mode Only Command)
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