How to find two line through grep?

[Vipin Sharma - EDS Datacenter Contractor]

Hi Guys,

I have to grep for a word and it should show the next line also on the result. 
Like if I say 

#cat format.out|grep SUN4

then it should show me

0. c0t10d0 <SUN4.2G cyl 3880 alt 2 hd 16 sec 135>
          /sbus at 3,0/SUNW,fas at 3,8800000/sd at a,0

I would like to have in command if it can be done with awk,nawk or grep.I dont 
want execute a script to do it.

Any help would be appreciated.

Thanx
VS