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21. Basic MPLS - LDP

Ok, time for some MPLS! For this lab I will be using the OSPF routing

protocol first, then we can move to IS-IS next. All we will be doing here is

configuring LDP

First up, lets enabled LDP on all OSPF interfaces. Normally you would do

this under each interface, but here we will use the MPLS LDP AUTOCONFIG

command. This is a good command to use as it ensures that you do not miss

configuring LDP on an interface.

RP/0/7/CPU0:R1#

RP/0/7/CPU0:R1#conf t

Sun Apr 1 18:58:04.084 UTC

RP/0/7/CPU0:R1(config)#router ospf LAB

Under the OSPF LAB process, we need to configure mpls ldp autoconfig and then

commit it.

RP/0/7/CPU0:R1(config-ospf)#mpls ldp auto

RP/0/7/CPU0:R1(config-ospf)#commit

Sun Apr 1 18:58:12.277 UTC

RP/0/7/CPU0:R1(config-ospf)#exit

RP/0/7/CPU0:R1(config)#exit

Ok, now lets see what interfaces have LDP on them

RP/0/7/CPU0:R1#sh mpls ldp int

Sun Apr 1 18:58:18.902 UTC

MPLS LDP application must be enabled to use this command

Ahh, we configured the command but never enabled MPLS LDP. Remember, if a

process is not needed – it does not run. So, lets enable the process

RP/0/7/CPU0:R1#conf t

Sun Apr 1 18:58:22.811 UTC

RP/0/7/CPU0:R1(config)#mpls ldp

Now, one thing to note on IOS XR, LDP is the only label protocol supported,

TDP is not available.

RP/0/7/CPU0:R1(config-ldp)#label ?

accept Configure inbound label acceptance control

advertise Configure outbound label advertisement control

allocate Configure label allocation control

<cr>

RP/0/7/CPU0:R1(config-ldp-lbl)#tag?

% Invalid input detected at '^' marker.

RP/0/7/CPU0:R1(config-ldp)#comm

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Cisco Router IOS XR Manuale Utente Pagina 75