Router-ID & BGP address-family questions

Hi Experts,
I have 3 general questions:
1 - When it is necessary to put router-id manually (whether OSPF, BGP)....?
during MPLS?MPBGP?IPv6....
2 - when do we need to put under bgp: no bgp default ipv4-unicast ? and use
address-family ipv4?
3 - if we have interface as ip unnumbered, can we include its subnet (taken
from loopback not in routing protocol) in routing protocol?
Please clarify these points!!!

Thanks,

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Received on Mon Jan 31 2011 - 12:57:18 ART