Porto have conceded as many goals tonight as they have in the nine previous Champions League games this season combined. Might as well do it properly.

BBC Radio 5 live's Pat Nevin at Allianz Arena

"It's a phenomenal display. Bayern's striking is very good but the defending is dreadful, borderline embarrassing. Maybe they're not fully fit. They don't look up for it. They don't believe and they're not fit or strong enough."

Image source, Getty Images

If anybody knows where the Porto defence is, their manager is looking for them. It's 5 (five) now for brilliant Bayern as Thomas Muller picks out Robert Lewandowski and the striker shimmies before planting the ball into the bottom corner. Can I have eight on the sweep?

Neymar now has two tonight for Barcelona, who are beating Paris St-Germain 2-0, 5-1 on aggregate.

Follow our dedicated live text on that game.

Ulysses Salmon: Guardiola found out? No. People who mouth off about football like experts but know naff all found out?

ZeeZee: Where are those people who were calling Guardiola a fraud last week? Normality resumed. First leg was a smoke screen.

Madan Roka: Using Rafinha/Lahm as RB/RW to add the width lacking from pocket players Gotze/Muller is something I never saw coming from Pep.

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BBC Radio 5 live's Pat Nevin at Allianz Arena

"It's difficult to see Porto not getting embarrassed now. It's one-way traffic. Bayern are playing really well but that goal is a bit of a mess. There's a big deflection but the keeper lifts his legs and it goes through them. You wouldn't be surprised if they took Fabiano off at half-time. Three of the four could have been stopped."

Image source, Getty Images

This is the quarter-finals of the Champions League, the best club competition in the world... and it's all too easy for Bayern. They are pulling apart Porto like a ravenous pack of wolves - Thomas Muller's shot from the edge of the area taking a deflection off Bruno Indi and wrong-footing the keeper to nestle in the back of the net. Shall we run a sweep? I'm going for seven.

Andy Wood: If this was boxing, the ref would have stopped it

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Come on Diego, it's not your night - Porto send on Ricardo in place of Diego Reyes. The horse has bolted, lads.

Rob Gallagher: Bayern starting to run riot! So disappointing for Porto, actually thought they had a chance tonight :/

Suresh: Bayern showing they can give a two-goal start to a team and still hand out a tonking!!

Belete Eshetea: Breathtaking football from Bayern!

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It might look like nuclear toxic waste, or like Slimer from Ghostbusters has been squashed, but this is the game's heat map. Bayern utterly dominant.

Image source, opta

BBC Radio 5 live's Pat Nevin at Allianz Arena

"We're not going to get too carried away but they've already scored seven goals in two Champions League games this season. You wouldn't be surprised if they put in a barrelful of goals tonight. Superb Bayern play."

Image source, Reuters

It's never wise to poke a tiger. Porto did that last week, and are paying the price now - Bayern storming into a three-goal lead inside the first half hour. A ball into the box is expertly helped on by Thomas Muller and Robert Lewandowski stoops to put his side in front in the tie.

Image source, AP

We'll let you know when Porto touch the ball. Honestly.

BBC Radio 5 live's Pat Nevin at Allianz Arena

"Forget all the sophisticated play - you don't need.it. A corner to the back post is headed back to the six-yard line and Boateng is able to head it home. Bayern have been absolutely brilliant. Porto could be in for a hammering."

That noise you've just heard... that's the roar from Munich. The continent's giants have woken from their slumber to take charge of this tie. Jerome Boateng is the man, heading home from close range after Holger Badstuber - guilty of a mistake in the first leg - flicked the ball on.

Image source, AP

Dr O: Bayern has vexed tonight.... Chasing everything, tackling anything

Snr Neave: Credit has to be given to Martin Atkinson for the goal! Played a good advantage! Easily England's best ref!

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It's poor from Porto. They are under the cosh and the minute they take a goal-kick and have an opportunity to take a breath, they give possession right back. They've got to improve here.

BBC Radio 5 live's Pat Nevin at Allianz Arena

"There was a real confidence among the Bayern Munich fans and players before the game, well they'll utterly believe they are going to do this now. Pep Guardiola will want to get this done right now. If they can get another goal before half-time that will be a hammer blow to Porto."

Bayern look like they've got an extra player out there - they crowd out Porto whenever they get the ball in the Bayern half. They are bang up for this.