Good ole' "On Insert: Reload". Yeah the bus stalls are priceless, you're best bet is to plan like you're taking down the router, and if it works, hey you just saved some downtime, and are done early. That being said, at least the actual crashes aren't terribly common, so you can do low risk stuff without to much fear as long as there's redundancy. VRRP is a godsend for those that do actual maintenance / changes to their network on a regular basis.
You'd be surprised at how easy it is to take down a router by just being to slow with the insert or removal, since its multiphase. I've had more issues from that alone from certian technicians, than actual card or software bugs. Once those contact pins touch on insert, or are broken on removal, you have very little time to complete the move before processes freak out over the bus stall, due to how the router protects itself, amusingly enough, from more issues stemming from data corruption. -Blake On Wed, Nov 10, 2010 at 18:49, John Neiberger <[email protected]> wrote: > On Wed, Nov 10, 2010 at 5:28 PM, Benjamin Lovell <[email protected]> > wrote: > > It's true. Bad things can happen. Primary one is buss stall. They are not > > supposed to happen anymore but there are bugIDs out there that prove they > > do. During buss stall we can't do forwarding lookups to PFC(pretty sure > DFC > > lookups still work). Even worse is that during buss stall interrupts are > > disabled so packets can't be punted to the control plane and BFD packets > > which are generated in interrupt context can't be sent. > > > > Usually these things happen for a short enough period of time that the > > effects are minor or completely unnoticed unless you are running some > things > > with tight timers like BFD tuned down, OSPF fast hellos, etc > > > > -Ben > > I know for a fact that buss stalls happen because we saw it happen > last night! ;) > _______________________________________________ > 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/
