[3.5 Dnd] - Summoned Creatures and Damage Reduction Rules Question

[Bombay]

If a player summons an elemental with 10/+2 damage reduction, am I correct in assuming a typical monster (say a dragon using a claw/claw/bite routine) would need to overcome the DR to actually do damage to it? Seems overpowered, but I've not found anything to the contrary.

--Bombay

[MrBubbles]

Is this 3.0?

In 3.5, DR is /Magic instead of +2.

But unless the creatures attacks are treated as magic (+2 in 3.0's case): his DR won't be bypassed unless the creature deals enough damage in each attack
(If dragon deals 11 with each attack, then you are hit by 1 each time).