Hierarchical FIB is not enabled by default on 7600 and you must enable "cef table output-chain build favor convergence-speed" like you mention.
Turning it on should have no impact. Turning it off could see a route reprogram event and could cause packet loss while it happens. As with everything, use caution. The difference in commands is mainly in relation to software/memory. This has the biggest impact on software based platforms like the 7200 but you'll see an uptick in RP/SP memory usage by enabling, but only changes how routes are built in hardware. On Fri, Apr 25, 2014 at 3:30 AM, redscorpion69 <[email protected]>wrote: > Hello, > > Does 7600 runs Hierachical FIB by default? > > The command to enable this should be: > > *cef table output-chain build favor convergence-**speed* > > The default on 7600 seems to be: > > > > *cef table output-chain build favor default* > The document says: > > "General Characteristics > > Use the *cef table output-chain build favor* command to override the Cisco > Express Forwarding table default operational behavior used to build output > chains for forwarding of network traffic. > The default behavior for output chain building favors convergence, if this > behavior is permitted by the platform." > > So, does this mean that I can leave default for BGP PIC, and if not, what > would be that impact of changing from *default *to *convergence-speed*? > Could it be done during production? > > Regards > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
