Configuration manual

BGP Regular Expression Optimization
The Dell 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 affect BGP routing convergence. Also, show bgp commands that get
filtered 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, notifications, 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 notifications 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 filter by prefix name.
EXEC Privilege mode
debug ip bgp [ip-address | peer-group peer-group-name] updates [in | out]
[prefix-list name]
• Enable soft-reconfiguration debug.
EXEC Privilege mode
debug ip bgp {ip-address | peer-group-name} soft-reconfiguration
In-BGP is shown using the show ip protocols command.
The system displays debug messages on the console. To view which debugging commands are enabled,
use the show debugging command in EXEC Privilege mode.
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Border Gateway Protocol IPv4 (BGPv4)