"no ip bgp default ipv4-unicast"

Hi Experts,

I have one doubt regarding "no ip bgp default ipv4-unicast".

This command is mentioned in most of the books as required to disable IPv4
BGP neighborship between router reflector client and router reflector, when
we want to use router reflector only to reflect VPNv4 routes.

But we can disable Ipv4 BGP neighborship by using "no neighbor <> activate"
under address-family ipv4.

So my question is why at all we need "no ip bgp default ipv4-unicast"
command under router bgp config ?

-- 
Regards,
*Gaurav Thukral*
Blogs and organic groups at http://www.ccie.net