Do I always need tag-switching ip

Do I always need tag-switching ip on a mpls interface
And what does it actually do
Regards
PEr

Hi
It doesnt really mention anything regarding the
tag-switching ip command
this is what i have in my config
interface FastEthernet0/0
no ip address
duplex auto
speed auto
interface FastEthernet0/0.103
encapsulation dot1Q 103
ip address 10.1.1.9 255.255.255.252
mpls traffic-eng tunnels
tag-switching ip
interface FastEthernet0/0.104
encapsulation dot1Q 104
ip address 10.1.1.13 255.255.255.252
mpls traffic-eng tunnels
interface FastEthernet0/0.108
encapsulation dot1Q 108
ip vrf forwarding int-cust
ip address 192.168.1.14 255.255.255.252
interface FastEthernet0/0.131
encapsulation dot1Q 131
ip address 10.111.64.237 255.255.255.0
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
as you can see some of the interfaces uses tag-switching ip and others dont
can you clearify if its needed or not and what does it do.
In this config there is no mpls ip commands ????
Regards

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