Dell Force10 S4810P - BGP Regular Expression Optimization; Debugging BGP

Border Gateway Protocol | 239
BGP Regular Expression Optimization
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. FTOS
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. This feature is turned on by default.
Use the command
bgp regex-eval-optz-disable in CONFIGURATION ROUTER BGP mode to
disable it if necessary.
Debugging BGP
Use any of the commands in EXEC Privilege mode to enable BGP debugging.
FTOS displays debug messages on the console. To view which debugging commands are enabled, use the
show debugging command in EXEC Privilege mode.
Use the keyword no followed by the debug command To disable a specific debug command. For example,
to disable debugging of BGP updates, enter
no debug ip bgp updates command.
Command Syntax Command Mode Purpose
debug ip bgp [ip-address | peer-group
peer-group-name] [in | out]
EXEC Privilege View all information on BGP, including BGP
events, keepalives, notifications, and updates.
debug ip bgp dampening [in | out] EXEC Privilege View information on BGP route being dampened.
debug ip bgp [ip-address | peer-group
peer-group-name] events [in | out]
EXEC Privilege View information on local BGP state changes and
other BGP events.
debug ip bgp [ip-address | peer-group
peer-group-name] keepalive [in | out]
EXEC Privilege View information about BGP KEEPALIVE
messages.
debug ip bgp [ip-address | peer-group
peer-group-name] notifications [in | out]
EXEC Privilege View information about BGP notifications received
from or sent to neighbors.
debug ip bgp [ip-address | peer-group
peer-group-name] updates [in | out]
[prefix-list name]
EXEC Privilege View information about BGP updates and filter by
prefix name
debug ip bgp {ip-address |
peer-group-name} soft-reconfiguration
EXEC Privilege Enable soft-reconfiguration debug. Enable
soft-reconfiguration debug.
To enhance debugging of soft reconfig, use the
following command only when route-refresh is not
negotiated to avoid the peer from resending
messages:
bgp soft-reconfig-backup
In-BGP is shown via the show ip protocols
command.