[c-nsp] Layer 2 VLAN advice..

[Peter Kranz]

So in terms of enabling MPLS on a fully meshed set of routers running BGP
and OSPF.. 

Here are the general steps I believe;

#conf t
Tag-switching advertise-tags
!
Int g0/0 
	Mtu 9216	
	Tag-switching ip
!

However, what can I expect to happen when this is done, i.e. will existing
BGP sessions drop between the routers who's interfaces I have changed to
tag-switching IP? What other kinds of gotchas? 

Ideally I'd like to add MPLS capabilities in a hitless manner to the
existing network.	

-Peter