MPLS-TE

As I promised, a short briefing on the MPLS-TE.

CONFIGURATION CONCEPT

 1) Configuring a Device to Support Tunnels

Enable standard CEF operation.
Enables the MPLS traffic engineering tunnel feature on a device.

Router(config)# ip cef
Router(config)# mpls traffic-eng tunnels

and additions

Router(config)#mpls traffic-eng logging lsp setups
Router(config)#mpls traffic-eng logging lsp teardowns
Router(config)#mpls traffic-eng reoptimize events link-up

2) Configuring an Interface to Support RSVP-based Tunnel Signalling and IGP Flooding 

Enable the MPLS traffic engineering tunnel feature on an interface.
Enable RSVP for IP on an interface and specify amount of bandwidth to be reserved.

Router(config-if)# mpls traffic-eng tunnels
Router(config-if)# ip rsvp bandwidth [bandwidth]

and additions:

Router(config-if)# mpls traffic-eng administrative-weight 100

3) Configuring extension for MPLS Traffic Engineering

a) Configuring IS-IS for MPLS Traffic Engineering

Enable IS-IS routing and specify an IS-IS process for IP, which places you in router configuration mode. Turn on MPLS traffic engineering for IS-IS level 1
Specify the traffic engineering router identifier for the node to be the IP address associated with interface loopback0.
Configure a router to generate and accept only new-style TLVs.

Router(config)# router isis
Router(config-router)# mpls traffic-eng level-1
Router(config-router)# mpls traffic-eng router-id loopback0
Router(config-router)# metric-style wide

b) Configuring OSPF for MPLS Traffic Engineering 

Configures OSPF routing process for IP, which places you in global configuration mode.
The process ID is an internally used identification parameter for an OSPF routing process. It is locally assigned and can be any positive integer. A unique value is assigned for each OSPF routing process.
Turn on MPLS traffic engineering for OSPF area 0.
Specify the traffic engineering router identifier for the node to be the IP address associated with interface loopback0.

Router(config)# router ospf process-id
Router(config-router)# mpls traffic-eng area 0
Router(config-router)# mpls traffic-eng router-id loopback0

4) Configuring an MPLS Traffic Engineering Tunnel

a) Configuring an MPLS Traffic Engineering Tunnel not be used IGP path 

Configure an interface type and enter interface configuration mode.
Give the tunnel interface an IP address. An MPLS traffic engineering tunnel interface should be unnumbered since it represents a unidirectional link.
Specify the destination for a tunnel. Set encapsulation mode of the tunnel to MPLS traffic engineering.
Configure bandwidth for the MPLS traffic engineering tunnel.
Configure the tunnel to use a named IP explicit path.
Configure the tunnel to use a path dynamically calculated from the traffic engineering topology database.
Path option 2 is used if path option 1 is currently unavailable.

Router(config)# interface tunnel1 
Router(config)# ip unnumbered loopback0
Router(config-if)# tunnel destination A.B.C.D
Router(config-if)# tunnel mode mpls traffic-eng
Router(config-if)# tunnel mpls traffic-eng bandwidth [bandwidth]
Router(config-if)# tunnel mpls traffic-eng path-option 1 explicit name test
Router(config-if)# tunnel mpls traffic-eng path-option 2 dynamic

ip explicit-path name test enable
next-address strict A.B.C.D
next-address strict A.B.C.D

additions:

tunnel mpls traffic-eng priority 0 0 

b) To configure an MPLS traffic engineering tunnel to be used by an IGP 

Causes the IGP to use the tunnel in its enhanced SPF calculation.

Router(config-if)# interface tunnel1 
Router(config-if)# tunnel mpls traffic-eng autoroute announce

EXAMPLE

1) Configuring a Device to Support Tunnels
---------------------------------- 
You must enter the following commands (step 1 and 2) on EVERY ROUTER in the traffic-engineered portion of your network. 
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IS-IS 

Step 1: MPLS Traffic Engineering Configuration

ip cef
mpls traffic-eng tunnels

interface loopback 0
ip address 11.11.11.11 255.255.255.255
ip router isis

interface s1/0
ip address 131.0.0.1 255.255.0.0
ip router isis

mpls traffic-eng tunnels
ip rsvp bandwidth 1000

Step 2: IS-IS Configuration

router isis
network 47.0000.0011.0011.00
is-type level-1
metric-style wide
mpls traffic-eng router-id Loopback0
mpls traffic-eng level-1

OSPF 

Step 1. MPLS Traffic Engineering Configuration

ip cef
mpls traffic-eng tunnels

interface loopback 0
ip address 11.11.11.11 255.255.255.255

interface s1/0
ip address 131.0.0.1 255.255.0.0
mpls traffic-eng tunnels
ip rsvp bandwidth 1000

Step 2: OSPF Configuration

router ospf 0
network 10.0.0.0.255.255.255 area 0
mpls traffic-eng router-id Loopback0
mpls traffic-eng area 0

2) Configuring an MPLS Traffic Engineering Tunnel ( OSPF Example )

This example shows you how to configure a dynamic path tunnel and an explicit path in the tunnel. Before you configure MPLS traffic engineering tunnels, you must enter the appropriate global and interface commands on the specified router.

Tunnel1

Tunnel 1: Dynamic Path Tunnel Configuration

interface tunnel1
  ip unnumbered loopback 0
  tunnel destination 15.15.15.15
  tunnel mode mpls traffic-eng
  tunnel mpls traffic-eng bandwidth 100
  tunnel mpls traffic-eng priority 1 1
  tunnel mpls traffic-eng path-option 1 dynamic

If everything is configured correctly, you can be happy ^_^ and see it here

16:24:40.747: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel1, changed state to up

Tunnel 1: Dynamic Path Tunnel Verification

show mpls traffic-eng tunnel  
show ip interface tunnel1

and ping

Tunnel2

Tunnel 2: Explicit Path Tunnel Configuration

interface tunnel2
  ip unnumbered loopback 0
  tunnel destination 15.15.15.15
  tunnel mode mpls traffic-eng
  tunnel mpls traffic-eng bandwidth 100
  tunnel mpls traffic-eng priority 1 1
  tunnel mpls traffic-eng path-option 1 explicit identifier 1

Explicit Path Configuration

ip explicit-path identifier 1
 next-address 131.0.0.1 
 next-address 135.0.0.1 
 next-address 136.0.0.1 
 next-address 133.0.0.1 

Tunnel 2: Explicit Path Tunnel Verifcation This section includes the commands that verify that the tunnel is up.

show mpls traffic-eng tunnel  
show ip interface tunnel2

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Aaaaaand

Congratulations, the task is completed.