Setup Guide

BGP Regular Expression Optimization
Dell EMC Networking OS optimizes processing time when using regular expressions by caching and re-using regular expression evaluated
results, at the expense of some memory in RP1 processor.
BGP policies that contain regular expressions to match against as-paths and communities might take a lot of CPU processing time, thus
aect BGP routing convergence. Also, show bgp commands that get ltered through regular expressions can to take a lot of CPU cycles,
especially when the database is large.
This feature is turned on by default. If necessary, use the bgp regex-eval-optz-disable command in CONFIGURATION ROUTER
BGP mode to disable it.
Debugging BGP
To enable BGP debugging, use any of the following commands.
• View all information about BGP, including BGP events, keepalives, notications, and updates.
EXEC Privilege mode
debug ip bgp [ip-address | peer-group peer-group-name] [in | out]
• View information about BGP route being dampened.
EXEC Privilege mode
debug ip bgp dampening [in | out]
• View information about local BGP state changes and other BGP events.
EXEC Privilege mode
debug ip bgp [ip-address | peer-group peer-group-name] events [in | out]
• View information about BGP KEEPALIVE messages.
EXEC Privilege mode
debug ip bgp [ip-address | peer-group peer-group-name] keepalive [in | out]
• View information about BGP notications received from or sent to neighbors.
EXEC Privilege mode
debug ip bgp [ip-address | peer-group peer-group-name] notifications [in | out]
• View information about BGP updates and lter by prex name.
EXEC Privilege mode
debug ip bgp [ip-address | peer-group peer-group-name] updates [in | out] [prefix-list name]
• Enable soft-reconguration debug.
EXEC Privilege mode
debug ip bgp {ip-address | peer-group-name} soft-reconfiguration
To enhance debugging of soft recong, use the bgp soft-reconfig-backup command only when route-refresh is not negotiated
to avoid the peer from resending messages.
In-BGP is shown using the show ip protocols command.
Dell EMC Networking OS displays debug messages on the console. To view which debugging commands are enabled, use the show
debugging
command in EXEC Privilege mode.
Border Gateway Protocol (BGP)
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