> Thomas Schmid > Sent: Monday, August 27, 2018 3:01 PM > To: [email protected] > Subject: Re: [c-nsp] ASR9k: RIB/FIB convergence > > Hi, > > Am 21.08.2018 um 16:35 schrieb Thomas Schmid: > > Hi, > > > > to give you an update: TAC finally could reproduce the issue in the lab. > RIB/FIB sync is thwarted when there's a VSM module installed in the chassis > (which we have in all 9k chassis). > > > > Let's see if they can fix it with a SMU ... > > > > latest news: FIB updates are sent via the punt-switch (sort of regular > ethernet switch on the RP) as multicast to all LCs. On A99-RP2-SE RPs this > switch has flow control enabled. Now, the VSM LC answers to these updates > with PAUSE frames and therefore the switch throttles the update rate to all > LCs close to zero. > > Good news: as a workaround you can disable flow-control to the punt-switch > via CLI for specific LCs. > > I'm reluctant to share the CLI command here because it's very hardware > specific and I don't want anybody to run into problems just because their > hardware is slightly different from ours. > > Cisco will provide a SMU in the next weeks that either disables flow-control > on these LC or changes the throttle thresholds (not decided yet). > Thank you very much for the update,
This begs a question if the flow-control is enabled (i.e. the punt sw reacts to pause frames), under what circumstance can this happen with other line-cards. In other words under which circumstances do various line-cards issue pause frames, or is just VSM capable of sending pause frames (an artefact of being a sort of "PC") adam netconsultings.com ::carrier-class solutions for the telecommunications industry:: _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
