The Ravens and linebacker Daryl Smith agreed on a four-year deal Friday that solidifies the middle of Baltimore's defense.

The sides reached agreement on Smith's 32nd birthday, and the middle linebacker appeared to consider the development to be a delightful present.

''I'm really just fired up. I knew I wanted to be back and I'm happy we could come to an agreement so I could get back in there for four years,'' Smith said. "Just the organization as a whole is really first class with everything they do. I love my teammates, the coaches are great coaches.''

Smith started all 16 games for the Ravens in 2013 and led the team with 123 tackles. He also had a career-high 19 passes defensed, setting a Ravens record by a linebacker.

Signing the 6-foot-2, 250-pound Smith was a priority for the team during the offseason.

''There are a lot of smiles around the building today after we got a commitment from Daryl Smith to stay a Raven,'' general manager Ozzie Newsome said. ''He fills a need for us at a high level. ... He's tough, he's consistent, he's intelligent.''