Ulster's scrum-half splits the posts off the tee to cut the lead to two.

I've just clocked that in the aftermath of that third Glasgow try, Ulster lock Kieran Treadwell was yellow carded.

The visitors' indiscipline has caught up with them.

Tony McWhirter
1999 Ulster European Cup winner on BBC Radio Foyle

They deserved that. It is tremendously well made.

Steven Kitshoff is on for his Ulster debut, and has a big defensive set to focus on, as Tom Jordan kicks another penalty into the corner.

Can they take the lead for the first time tonight?

More good play from Glasgow gets them into Ulster territory, but Kyle Rowe can't hold onto the ball and gifts possession back to the Irish side.

Tommy Seymour
Former Scotland winger on BBC Radio Foyle

It was an incredibly impressive first 15 minute period from Ulster. Gave very few inroads or Glasgow had very few inroads into the game.

Glasgow have one of the highest retention rates in the league, so your discipline needs to be squeaky clean. Ulster really need to look after their discipline in the second half.

Sione Tuipulotu barges his way over the line, but is held up by the legs of Harry Sheridan.

A quick TMO check confirms that, and so we'll have a goal-line drop-out.

Glasgow have started brightly in this second half, with Sebastian Cancelliere making a good break down the right wing.

The momentum stays with the hosts and Ben Whitehouse awards them a penalty, which Tom Jordan kicks to the corner.

We are back under way at chilly Scotstoun...

Here's a look at the two Glasgow tries that have sent the sides in level at the break.

Image source, SNS

Image source, SNS

It's been a strange old half that.

Ulster were totally dominant for the opening 15 minutes or so, and deservedly took a 14-point lead, but from there, it's been all Glasgow.

Had the hosts' lineout performed to its usual levels, they could feasibly be in front.

All to play for after the break.

Tony McWhirter
1999 Ulster European Cup winner on BBC Radio Foyle

That's been coming for the last 10 minutes. Glasgow have been slowly turning the dial. It was either going to be a yellow for Ulster or a try for Glasgow.

Ben Whitehouse gives Iain Henderson a final warning about discipline as Glasgow win another penalty.

I was expecting a card there.

Tom Jordan goes to the corner again, unperturbed by the previous lineout troubles.

Ulster have been immense in defence so far.

Phase after phase for Glasgow, but are finding it really tough to get over the gainline.

Glasgow turnover possession and are back in the opposition 22.

Surely they have to make one of these visits count?

My word, this is scrappy.

Yet another penalty goes Glasgow's way, yet again Tom Jordan kicks to the corner, and yet again the lineout misfires.

Franco Smith will be fuming.

A huge Glasgow scrum sees Ben Whitehouse award the hosts a penalty, but the lineout fails to click once again after Tom Jordan kicks to the corner.

It's another Ulster scrum. I've got deja vu here.

The ball goes straight to ground from the lineout, as Scott Cummings uncharacteristically fumbles, and Ulster survive.