Non MPLSAware ATM Switches

ATM Switch/LSR

Router

Non MPLS-aware ATM Switch

Virtual Path Tunnel

ATM Network

ATM Network

MPLS Network

In the example network, the ATM LSR denver-atm is now non-MPLS-aware. Figure 5-14 shows the VP tunnel across the LSR denver-atm.

Figure 5-14 VP Tunnels Across denver-atm

Virtual Path Tunnel

Figure 5-14 VP Tunnels Across denver-atm

Virtual Path Tunnel

A VP tunnel is created from the LSR washington-atm to the LSR brussels-atm that carries the LVCs across the non-MPLS-aware ATM switch. Look at Example 5-21 to see the configuration needed on the LSRs. An ATM subinterface is created for the VP tunnel.

Example 5-21 Configuration for MPLS over VP Tunnel hostname washington-atm

mpls label protocol ldp tag-switching tdp router-id Loopback0 force

interface Loopback0 ip address 10.200.253.2 255.255.255.255

interface ATM0/0/1 ip unnumbered Loopback0

Example 5-21 Configuration for MPLS over VP Tunnel (Continued)

atm pvp 12 tag-switching ip

interface ATM0/0/1.12 point-to-point ip unnumbered Loopback0 tag-switching ip hostname denver-atm !

interface ATM2/0/0 ip unnumbered Loopback0

interface ATM2/0/1 ip unnumbered Loopback0 atm pvp 20 interface ATM2/0/0 12

hostname brussels-atm !

interface ATM2/0/1 ip unnumbered Loopback0 atm pvp 20

interface ATM2/0/1.20 point-to-point ip unnumbered Loopback0 tag-switching ip

NOTE PVP stands for permanent virtual path.

The PVP 12 is switched to PVP 20 on the ATM switch denver-atm. The LSR washington-atm now forms an OSPF adjacency and LDP neighborship directly with the LSR brussels-atm across the

VP tunnel. The LVCs (TVCs) are created onto the VP tunnel as they are mapped onto the created subinterface. Example 5-22 shows this.

Example 5-22 Verifying MPLS over VP Tunnel

denver-atm#show

atm vp

Interface

VPI Type

X-Interface

X-VPI

Status

ATM2/0/0

12 PVP

ATM2/0/1

20

UP

ATM2/0/1

20 PVP

ATM2/0/0

12

UP

washington-atm#show ip ospf

neighbor

Neighbor ID

Pri State

Dead Time

Address

Interface

10.200.253.3

1 FULL/

- 00:00:32

10.200.253.3

ATM0/0/1.12

10.200.253.4

1 FULL/

- 00:00:37

10.200.253.4

ATM0/0/2

washington-atm#show mpls ldp neighbor

Peer LDP Ident:

10.200.253.

4:1; Local LDP Ident

1

.200.253

.2:2

TCP connection: 10.

200.253.4.48103 - 10

.200.253.2.

646

State:

Oper; Msgs sent/rcvd: 123/122; Downstream on demand

Up time

: 01:13:07

LDP discovery sources:

ATM0/0/2, Src IP

addr: 10.200.253.4

Peer LDP Ident:

10.200.253.

3:2; Local LDP Ident

1

.200.253

.2:3

TCP connection: 10.

200.253.3.11316 - 10

.200.253.2.

646

State:

Oper; Msgs sent/rcvd: 29/29; Downstream on

demand

Up time

: 00:18:44

LDP discovery sources:

ATM0/0/1.12, Src

IP addr: 10.200.253.

3

washington-atm#show atm vc

interface ATM 0/0/1.

12

Interface

VPI VCI

Type X-Interface

X-VPI

X-VCI

Encap

Status

ATM0/0/1.12

12 3

PVC ATM0

0

169

SNAP

UP

ATM0/0/1.12

12 4

PVC ATM0

0

170

SNAP

UP

ATM0/0/1.12

12 5

PVC ATM0

0

168

QSAAL

UP

ATM0/0/1.12

12 16

PVC ATM0

0

167

ILMI

UP

ATM0/0/1.12

12 18

PVC ATM0

0

213

PNNI

UP

ATM0/0/1.12

12 32

PVC ATM0

0

197

SNAP

UP

ATM0/0/1.12

12 33

TVC(I) ATM0

0

218

MUX

UP

ATM0/0/1.12

12 33

TVC(O) ATM0/0/2

1

47

UP

ATM0/0/1.12

12 34

TVC(I) ATM0/0/2

1

39

UP

ATM0/0/1.12

12 34

TVC(O) ATM0/0/2

1

48

UP

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