We need to upgrade some ASR9Ks that have a lot of connected devices with complex interrelationships and we have to do a lot of work to make sure all the correct redundancy is in place prior to the upgrade. Since the router takes so long to reload, I'd like to find a way to essentially simulate the loss of forwarding for a minute or so to verify that our redundancy preparations were thorough, but I need to be able to back out of it quickly. I thought about shutting down the linecards but that's still a fairly long restart. I'm hoping to find some method much faster than that.
The simplest and most straightforward way is to shut down all the interfaces manually and then rollback if necessary. We can take it out of routing by setting the overload bit in ISIS, but that still leaves routing and forwarding in place for locally connected interfaces, which is what we want to stop. We were tossing around some ideas and wondered, probably just academically, if there were a way to completely stop forwarding temporarily. Is there a way to disable forwarding through an ASR9K that is easily and quickly reversible? We'll probably do the interface shutdown method since it's so simple, but now I'm curious what other options might be available. _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/