Bgp Regular Expression Optimization; Debugging Bgp - Dell Force10 S4810P Configuration Manual
High-density, 1ru 48-port 10gbe switch
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- Manual (60 pages) ,
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- Reference manual (1637 pages)
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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,
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
disable it if necessary.
Debugging BGP
Use any of the commands in EXEC Privilege mode to enable BGP debugging.
Command Syntax
debug ip bgp [ip-address | peer-group
peer-group-name] [ in | out ]
debug ip bgp dampening [ in | out ]
debug ip bgp [ip-address | peer-group
peer-group-name] events [ in | out ]
debug ip bgp [ip-address | peer-group
peer-group-name] keepalive [ in | out ]
debug ip bgp [ip-address | peer-group
peer-group-name] notifications [ in | out ]
debug ip bgp [ip-address | peer-group
peer-group-name] updates [ in | out ]
[ prefix-list name ]
{
debug ip bgp
ip-address
}
soft-reconfiguration
peer-group-name
FTOS displays debug messages on the console. To view which debugging commands are enabled, use the
show debugging
Use the keyword no followed by the debug command To disable a specific debug command. For example,
to disable debugging of BGP updates, enter
bgp regex-eval-optz-disable
Command Mode
EXEC Privilege
EXEC Privilege
EXEC Privilege
EXEC Privilege
EXEC Privilege
EXEC Privilege
|
EXEC Privilege
command in EXEC Privilege mode.
in CONFIGURATION ROUTER BGP mode to
Purpose
View all information on BGP, including BGP
events, keepalives, notifications, and updates.
View information on BGP route being dampened.
View information on local BGP state changes and
other BGP events.
View information about BGP KEEPALIVE
messages.
View information about BGP notifications received
from or sent to neighbors.
View information about BGP updates and filter by
prefix name
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.
no debug ip bgp updates
commands that get filtered
show bgp
command.
Border Gateway Protocol | 239
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Troubleshooting
