"What do you mean by routing flapping?"
"Well, say you're catching the tube home to Slough."
"I don't live in Slough."
"Don't you? Well let's say you do. So your plan is to walk to Tottenham Court Road and ride the Central line to Ealing Broadway, change to Elizabeth Line and ride that to Slough."
"I.."
"But on the way up Oxford Street you encounter a group of Vegan Crossfit enthusiasts who are in a piano accordion ensemble. After consulting the internet and not being able to find a local gun shop you're going to avoid the hippies and maybe leg it to Farringdon where you can ride the Elizabeth line direct. On the way there you encounter an old school mate who convinces you to have a quiet pint, which turns into eight quiet pints, a curry and another pint - at which point you find yourself, inexplicably, at Snaresbrook with a road cone under your arm. And it's late. You jump on a central line train not caring WHERE you're going to change at, so long as you're heading in the general direction of Slough."
"I don't live in Slough."
"Yeah, but say you did – and you need to get home. You're back on the Central line, you rest your eyes for a second and wake up at West Ruislip. You quickly consult the tube map and think maybe you could stumble to Ickenham and ride the Picadilly to maybe North Ealing and maybe run to Ealing Broadway and maybe get on the Elizabeth line. You manage to get to Ickenham, rest your eyes and wake up in Cockfosters and find the tube is no longer running. You try and find an Uber driver, but for some reason there isn't anyone remotely local so you walk for an hour and eventually find a minicab company that's still open who take you on a sightseeing tour of unfamiliar roads, dropping you halfway home because that's when your cash runs out. You see a night bus, only you're a bit turned around and get on the wrong one, rest your eyes for a moment, then wake up at St Paul's Cathedral at 4 in the morning. You walk to work, sneak past security and sleep in your office."
"And... that's what's happening to our network?"
"No, that's what happened to the PFY three nights ago."
"What's this got to do with the network? Do we need new network switches with better routing to stop this happening? Is that what you're saying?"
