topic Re: Basic MPLS configuration on CML. MPLS not being enabled... in DevNet Sandbox

Basic MPLS configuration on CML. MPLS not being enabled...

prinsloo007 — Mon, 09 Oct 2023 13:08:42 GMT

I configured the below basic MPLS core network on CML but when I try to enable MPLS on the interfaces within the MPLS core it is not being enabled. When I do a "sh mpls interface" or "sh mpls ldp neighbors" I don't get any output.

R1
hostname R1
int lo0 
ip add 1.1.1.1 255.255.255.255
ip ospf 1 area 0 

int f0/0
ip add 10.0.0.1 255.255.255.0
no shut
ip ospf 1 area 0

R2
hostname R2
int lo0
ip add 2.2.2.2 255.255.255.255
ip ospf 1 are 0 

int f0/0
ip add 10.0.0.2 255.255.255.0
no shut
ip ospf 1 area 0

int f0/1 
ip add 10.0.1.2 255.255.255.0 
no shut 
ip ospf 1 area 0 


R3
hostname R3
int lo0 
ip add 3.3.3.3 255.255.255.255
ip ospf 1 are 0 

int f0/0 
ip add 10.0.1.3 255.255.255.0 
no shut 
ip ospf 1 area 0

Step 2 – Configure LDP on all the interfaces in the MPLS Core

I tried the below 2 options to configure LDP on the interfaces.

At each interface enter the mpls ip command
Under the ospf process use the mpls ldp autoconfig command

R1
router ospf 1
mpls ldp autoconfig

R2
router ospf 1
mpls ldp autoconfig

R3
router ospf 1
mpls ldp autoconfig

Re: Basic MPLS configuration on CML. MPLS not being enabled...

balaji.bandi — Mon, 09 Oct 2023 13:47:31 GMT

what IOS image you using for router ?

show version - post here the output

1. are you able to ping p2p interface between routers

2. post show ip interface brief (see interface up )

( some device you need to disable ip cef on IOL Routers)

other side you need to enable ip cef (the one supported) also try global command - mpls label protocol ldp

3. Do you have ospf peering working , show ip ospf neigh

Re: Basic MPLS configuration on CML. MPLS not being enabled...

M02@rt37 — Mon, 09 Oct 2023 14:04:31 GMT

Hello @prinsloo007

take care on GNS3, sometimes due to commands, OSPF process is "shutdown".

All you config is pretty good. Do no shut on OSPF process if necesary.

Check OSPF adjencies on all Routers:

After that it should be good!

Note: add command #ip cef command on each Routers

Re: Basic MPLS configuration on CML. MPLS not being enabled...

AselaPerera9446 — Sat, 03 Aug 2024 03:49:21 GMT

I feel like buying CML is useless. will never reckon to anyone at least if you can't practice MPLS, it is a useless product.

Re: Basic MPLS configuration on CML. MPLS not being enabled...

MHM Cisco World — Sat, 03 Aug 2024 11:53:57 GMT

there is free GNS3 you can use
for CML it so useful for L2 and security

MHM

Re: Basic MPLS configuration on CML. MPLS not being enabled...

bigevilbeard — Sat, 03 Aug 2024 13:58:20 GMT

@AselaPerera9446 far as I am aware MPLS is supported on CML, unsure if this was an issue for the user on the sandbox version back when this posted https://developer.cisco.com/docs/modeling-labs/ios-xrv-9000/#features-tested-with-cml

Re: Basic MPLS configuration on CML. MPLS not being enabled...

Ramblin Tech — Sat, 03 Aug 2024 14:43:26 GMT

CML is far from useless and I have successfully configured MPLS on it many times. It is vital to identify the proper virtual node type to deploy for your particular use-case, as each node type has trade-offs between supported features and resource footprint (RAM, CPU) requirements, and no node type supports every feature.