Network Diagram

This document uses this network setup:Configurations

This document uses these configurations:

Quick Configuration Guide

Pomerol

Pulligny

Pauillac

Quick Configuration Guide

Complete these steps to configure MPLS:

Set up your network as usual (MPLS needs a standard IP connection in order to establish forwarding bases).

Ensure that the routing protocol (OSPF or IS-IS) is working correctly. These commands are shown in italics in the configurations in this section.

Use the ip cef command (for better performances, use the ip cef distributed command when available) in the general configuration mode (shown in bold in the configurations in this section) to enable.

Use the mpls ip command (or the tag-switching ip command on older Cisco IOS versions) in the general configuration mode and in each interface (shown in bold in the configurations in this section) to enable.

Note:  The LSRs must have (up) Loopback interfaces with an address mask of 32 bits.

Pomerol

Current configuration:

!

version 12.2

!

hostname Pomerol

!

ip cef

!--- Enables Cisco Express Forwarding globally.

!

interface Loopback0

 ip address 10.10.10.3 255.255.255.255

 ip router isis

!--- Assigns an IP address to interface loopback0

!--- and enables IS-IS for IP on the interface.

!

interface Serial0/0

 encapsulation frame-relay

!

interface Serial0/0.1 point-to-point

 ip address 10.1.1.6 255.255.255.252

 ip router isis

 tag-switching ip

!--- Enables dynamic Label Switching of

!--- IPv4 packets on an interface.

 frame-relay interface-dlci 301

!

interface Serial0/0.2 point-to-point

 ip address 10.1.1.9 255.255.255.252

 ip router isis

 tag-switching ip

 frame-relay interface-dlci 303

!

interface Serial0/0.3 point-to-point

 ip address 10.1.1.21 255.255.255.252

 ip router isis

 tag-switching ip

 frame-relay interface-dlci 306

!

router isis

 net 49.0001.0000.0000.0003.00

 is-type level-1

!

ip classless

!

end

Pulligny

Current configuration:

!

version 12.1

!

hostname Pulligny

!

ip cef

!

interface Loopback0

 ip address 10.10.10.2 255.255.255.255

!

interface Serial0/1

 no ip address

 encapsulation frame-relay

!

interface Serial0/0.1 point-to-point

 ip address 10.1.1.2 255.255.255.252

 ip router isis

 tag-switching ip

 frame-relay interface-dlci 201

!

interface Serial0/0.2 point-to-point

 ip address 10.1.1.10 255.255.255.252

 ip router isis

tag-switching ip

 frame-relay interface-dlci 203

!

router isis

 redistribute static ip

 passive-interface Loopback0

 net 49.0001.0000.0000.0002.00

 is-type level-1

!--- Enables the IS-IS process on the router,

!--- makes loopback interface passive

!--- (does not send IS-IS packets on interface),

!--- and assigns area and system ID to router.

!

ip classless

!

end

Pauillac

Current configuration : 2366 bytes

!

version 12.1

!

hostname pauillac

!

ip cef

!

interface Loopback0

 ip address 10.10.10.1 255.255.255.255

 ip router isis

!

interface Serial0/0

 no ip address

 encapsulation frame-relay

!

interface Serial0/0.1 point-to-point

 ip address 10.1.1.1 255.255.255.252

 ip router isis

 tag-switching ip

 frame-relay interface-dlci 102

!

interface Serial0/0.2 point-to-point

 ip address 10.1.1.5 255.255.255.252

 ip access-group 150 out

 ip router isis

 tag-switching ip

 frame-relay interface-dlci 103

!

interface Serial0/0.3 point-to-point

 bandwidth 512

 ip address 10.1.1.13 255.255.255.252

 ip router isis

 tag-switching ip

 frame-relay interface-dlci 104

!

interface Serial0/0.4 point-to-point

 ip address 10.1.1.17 255.255.255.252

 ip router isis

 tag-switching ip

 frame-relay interface-dlci 105

!

!

router isis

 net 49.0001.0000.0000.0001.00

 is-type level-1

!

ip classless

!

end

Verify

This section provides information you can use to confirm your configuration is working properly.

Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.

show tag-switching tdp neighbor

show tag-switching tdp bindings

show tag-switching forwarding-table

show tag-switching forwarding-table a.b.c.d detail

traceroute a.b.c.d

An exhaustive list of commands is included in the MPLS Command Reference. Other sample show commands are described in Configuring Basic MPLS Using OSPF.

Sample Output

The following output focuses on the LDP. The LDP currently implemented in IOS is TDP (Tag Distribution Protocol), which contains some Cisco-proprietary extensions, but it be used with LDP, the IETF official protocol for label distribution. TDP will be replaced by LDP in the future.

You can use the show tag-switching tdp * command to verify the state of TDP. You can see neighbors using the show tag-switching tdp neighbor command.

Pulligny# show tag-switching tdp discovery

Local TDP Identifier:

 10.10.10.2:0

TDP Discovery Sources:

  Interfaces:

 Serial0/0.1: xmit/recv

   TDP Id: 10.10.10.1:0

 Serial0/0.2: xmit/recv

   TDP Id: 10.10.10.3:0

!--- Ensure you are able to ping this IP address

!--- If not, check whether a route exists in the routing table

Pulligny# show tag-switching tdp neighbor

Peer TDP Ident: 10.10.10.1:0; Local TDP Ident 10.10.10.2:0

        TCP connection: 10.10.10.1.711 - 10.10.10.2.11001

        State: Oper; PIEs sent/rcvd: 27907/27925; ; Downstream

        Up time: 2w2d

        TDP discovery sources:

          Serial0/0.1

        Addresses bound to peer TDP Ident:

          10.1.1.1        10.1.1.13       10.1.1.17       10.10.10.1

          10.1.1.5        10.200.28.89

Peer TDP Ident: 10.10.10.3:0; Local TDP Ident 10.10.10.2:0

        TCP connection: 10.10.10.3.11001 - 10.10.10.2.711

        State: Oper; PIEs sent/rcvd: 22893/22874; ; Downstream

        Up time: 1w6d

        TDP discovery sources:

          Serial0/0.2

        Addresses bound to peer TDP Ident:

          10.200.28.91    10.1.1.6        10.1.1.9        10.1.1.21

          10.10.10.3You can use the show tag-switching tdp bindings command to view the established bindings between labels and routes.

Pulligny# show tag-switching tdp bindings

(...)

  tib entry: 10.10.10.4/32, rev 22

        local binding:  tag: 21

        remote binding: tsr: 10.10.10.1:0, tag: 22

        remote binding: tsr: 10.10.10.3:0, tag: 25

  tib entry: 10.10.10.6/32, rev 51

        local binding:  tag: 23

        remote binding: tsr: 10.10.10.3:0, tag: 18

        remote binding: tsr: 10.10.10.1:0, tag: 20

(...)You can use the show tag-switching forwarding-table command to see which bindings are used to build the LFIB.

Pulligny# show tag-switching forwarding-table

Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop

tag    tag or VC   or Tunnel Id      switched   interface

16     Pop tag     10.1.1.4/30       0          Se0/0.2    point2point

       Pop tag     10.1.1.4/30       0          Se0/0.1    point2point

17     Pop tag     10.1.1.20/30      0          Se0/0.2    point2point

18     Pop tag     10.10.10.3/32     0          Se0/0.2    point2point

19     Pop tag     10.10.10.1/32     0          Se0/0.1    point2point

20     Pop tag     10.1.1.12/30      0          Se0/0.1    point2point

21     Pop tag     10.1.1.16/30      0          Se0/0.1    point2point

22     20          10.10.10.5/32     0          Se0/0.1    point2point

23     22          10.10.10.6/32     0          Se0/0.2    point2point

24     22          10.10.10.4/32     0          Se0/0.1    point2pointYou can use the show tag-switching forwarding-table 10.10.10.4 detail command to view the details of a given destination.

Pulligny# show tag-switching forwarding-table 10.10.10.4 detail

Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop

tag    tag or VC   or Tunnel Id      switched   interface

21     22          10.10.10.4/32     12103      Se0/0.1    point2point

        MAC/Encaps=4/8, MTU=1500, Tag Stack{22}

        30918847 00016000

Per-packet load-sharingYou can also use the traceroute command, if the network does IP TTL propagation, to view the hops. Refer to Multiprotocol Label Switching on Cisco Routers for more information on the mpls ip ttl propagate command.

Pesaro# traceroute 10.10.10.4

Type escape sequence to abort.

Tracing the route to 10.10.10.4

  1 10.1.1.21 [MPLS: Label 25 Exp 0] 296 msec 256 msec 244 msec

  2 10.1.1.5 [MPLS: Label 22 Exp 0] 212 msec 392 msec 352 msec

  3 10.1.1.14 436 msec *  268 msecNote: Exp 0 appears in the output if the experimental field is used for Quality of Service (QoS).

Troubleshoot

There is currently no specific troubleshooting information available for this configuration.

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