Do I always need tag-switching ip

[per.nielsen]

Do I always need tag-switching ip on a mpls interface

And what does it actually do

Regards

PEr

[smoosa · Accepted solution]

Check the commands mpls ip in the global and interface configuration modes. This explains the need for mpls ip ( or tagswitching ip ) on an interface.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a00801a7ee8.html#wp1082792

Regards

[per.nielsen]

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

[smoosa]

Hi,

tag-switching ip is the pre-standard version of the command mpls ip ( they can be used interchangeably but since MPLS has been standardised, most documentation would tell you to use mpls ip ie substituting mpls for the tag-switching keyword ).Now when you enable tag-switching ip or mpls ip globally, you are turning on mpls forwarding of IP packets for the platform. This alone is not enough for you to be "tag" switching your ip packets out a particular interface. You need to turn on tag-switching ip or mpls ip on the interface you need to do MPLS forwarding of your ip packet.

Hope this helps.

Regards

[per.nielsen]

Hi

that Make sense

Thanks a lot

per