Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 197
BGP Regular Expression Optimization, Debugging BGP
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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, 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. Command Syntax debug ip bgp [ip-address | peer-group peer-group-name] [in | out] debug ip bgp dampening [in | out] Command Mode EXEC Privilege EXEC Privilege 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 | peer-group-name} soft-reconfiguration EXEC Privilege EXEC Privilege EXEC Privilege EXEC Privilege EXEC Privilege 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. FTOS 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 IPv4 (BGPv4) | 197
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