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Example: Logical System Configuration

Figure 35: Logical System Topology Diagram

Image g016933.gif

Figure 35 shows four pairs of customer edge (CE) routers that are connected across an MPLS backbone. Routers CE1 and CE5 are part of the red VPN, routers CE2 and CE6 are in the blue VPN, routers CE3 and CE7 belong to a VPLS domain, and routers CE4 and CE8 are connected with standard protocols. Two logical systems are configured on provider edge (PE) routers PE1 and PE2 and provider core Router P0. Each of these three routers has two logical systems: LS1 and LS2. To illustrate the concept of a logical system, both VPNs are part of logical system LS1, the VPLS instance belongs to LS2, and the remaining routers use the main router portion of routers PE1, P0, and PE2.

On Router CE1, configure OSPF to connect to the red VPN in logical system LS1 on Router PE1:

Router CE1

[edit]
interfaces {
fe-1/0/1 {
vlan-tagging;
unit 0 {
description "routing-instance red CE";
vlan-id 101;
family inet {
address 10.11.1.1/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.11.1.100/32;
}
}
}
}
protocols {
ospf {
area 0.0.0.0 {
interface fe-1/0/1.0;
interface lo0.0;
}
}
}

On Router CE2, configure BGP to connect to the blue VPN in logical system LS1 on Router PE1:

Router CE2

[edit]
interfaces {
fe-1/0/2 {
vlan-tagging;
unit 0 {
description "routing-instance blue CE";
vlan-id 102;
family inet {
address 10.21.1.1/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.21.1.100/32;
}
}
}
}
routing-options {
autonomous-system 200;
}
protocols {
bgp {
export export_loopback;
group to_PE {
type external;
local-address 10.21.1.1;
peer-as 100;
neighbor 10.21.1.2;
}
}
}
policy-options {
policy-statement export_loopback {
from {
route-filter 10.21.1.100/32 exact;
}
then accept;
}
}

On Router CE3, configure the Fast Ethernet interface in VLAN 600 to connect with the VPLS routing instance in logical system LS2 on Router PE1:

Router CE3

[edit]
interfaces {
fe-1/0/0 {
vlan-tagging;
unit 0 {
description "vpls interface";
vlan-id 600;
family inet {
address 10.1.1.1/24;
}
}
}
}

On Router CE4, configure the Fast Ethernet interface to connect with the main router at Router PE1:

Router CE4

[edit]
interfaces {
fe-1/0/3 {
vlan-tagging;
unit 0 {
description "main router interface";
vlan-id 103;
family inet {
address 10.31.1.1/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.255.41.177/32;
}
}
}
}

On Router PE1, create two VPN routing and forwarding (VRF) routing instances in logical system LS1: red and blue. Configure the CE-facing logical interfaces so that traffic from Router CE1 is placed in the red VPN and traffic from Router CE2 is placed in the blue VPN. Next, create a logical interface at fe-0/0/1.1 to connect to logical system LS1 on Router P0.

Also on Router PE1, create a VPLS routing instance in logical system LS2. Configure a logical interface so that traffic from Router CE3 is sent into the VPLS domain and connects to logical system LS2 on Router P0.

Create a logical system administrator for LS1. The logical system administrator can be responsible for the maintenance of this logical system.

Finally, configure a logical interface to interconnect Router CE4 with the main router portion of Router P0.

Router PE1

[edit]
logical-systems {
ls1 { # The configuration for the first logical system begins here.
interfaces {
fe-0/0/1 {
unit 1 { # This is the core-facing interface for logical system LS1.
description "ls1 interface";
vlan-id 101;
family inet {
address 10.11.2.1/24;
}
family iso;
family mpls;
}
}
fe-0/1/1 {
unit 0 { # This logical interface connects to Router CE1.
description "routing-instance red interface";
vlan-id 101;
family inet {
address 10.11.1.2/24;
}
}
}
fe-0/1/2 {
unit 0 { # This logical interface connects to Router CE2.
description "routing-instance blue interface";
vlan-id 102;
family inet {
address 10.21.1.2/24;
}
}
}
lo0 {
unit 1 {
description "ls1 loopback";
family inet {
address 10.10.10.10/32;
}
family iso {
address 47.1111.1111.1111.1111.00;
}
}
}
}
protocols { # You configure RSVP, MPLS, IS-IS, and BGP for logical system LS1.
rsvp {
interface all;
}
mpls {
label-switched-path to_10.10.10.12 {
to 10.10.10.12;
}
interface all;
}
bgp {
group to_other_PE {
type internal;
local-address 10.10.10.10;
family inet-vpn {
any;
}
neighbor 10.10.10.12;
}
}
isis {
interface all;
}
}
policy-options {
policy-statement from_bgp_to_ospf {
then accept;
}
}
routing-instances {
blue {
instance-type vrf; # You configure instance blue within logical system LS1.
interface fe-0/1/2.0;
route-distinguisher 10.10.10.10:200;
vrf-target target:20:20;
protocols {
bgp {#BGP connects the blue instance with Router CE2.
group to_CE {
type external;
local-address 10.21.1.2;
peer-as 200;
neighbor 10.21.1.1;
}
}
}
}
red {
instance-type vrf; # You configure instance red within logical system LS1.
interface fe-0/1/1.0;
route-distinguisher 10.10.10.10:100;
vrf-target target:10:10;
protocols {
ospf {#OSPF connects the red instance with Router CE1.
export from_bgp_to_ospf;
area 0.0.0.0 {
interface all;
}
}
}
}
}
routing-options {
autonomous-system 100;
}
}
ls2 {# The configuration for the second logical system begins here.
interfaces {
fe-0/0/1 {
unit 0 {# This is the core-facing interface for logical system LS2.
description "ls2 interface";
vlan-id 100;
family inet {
address 10.1.2.1/24;
}
family iso;
family mpls;
}
}
fe-0/1/0 {
unit 0 {# This logical interface connects to Router CE3.
description "vpls interface";
encapsulation vlan-vpls;
vlan-id 600;
family vpls;
}
}
lo0 {
unit 2 {
description "ls2 loopback";
family inet {
address 10.20.20.20/32;
}
family iso {
address 47.2222.2222.2222.2222.00;
}
}
}
}
protocols { # You configure RSVP, MPLS, IS-IS, and BGP for logical system LS2.
rsvp {
interface all;
}
mpls {
label-switched-path to_10.20.20.22 {
to 10.20.20.22;
}
interface all;
}
bgp {
group to_VPLS_PE {
type internal;
local-address 10.20.20.20;
family l2vpn {
signaling;
}
neighbor 10.20.20.22;
}
}
isis {
interface fe-0/0/1.0;
interface lo0.2;
}
}
routing-instances {
new {
instance-type vpls; # You configure VPLS within logical system LS2.
interface fe-0/1/0.0;
route-distinguisher 10.20.20.20:100;
vrf-target target:30:30;
protocols {
vpls {
site-range 10;
site newPE {
site-identifier 1;
}
}
}
}
}
routing-options {
autonomous-system 400;
}
}
}
interfaces {
fe-0/0/1 {
vlan-tagging;
unit 3 {# This is the core-facing interface for the main router of PE1.
description "main router to P0";
vlan-id 103;
family inet {
address 10.31.2.1/24;
}
family iso;
family mpls;
}
}
fe-0/1/3 {
vlan-tagging;
unit 0 {# This logical interface in the main router of PE1 connects to CE4.
description "main router to CE4";
vlan-id 103;
family inet {
address 10.31.1.2/24;
}
}
}
fe-0/1/0 {# You must always configure physical interface statements for
vlan-tagging; # logical system interfaces at the [edit interfaces] hierarchy level.
encapsulation vlan-vpls;
}
fe-0/1/1 {
vlan-tagging;
}
fe-0/1/2 {
vlan-tagging;
}
lo0 {
unit 0 {
description "main router loopback";
family inet {
address 10.255.41.173/32;
}
}
}
}
routing-options {
static {
route 10.255.41.177/32 next-hop 10.31.1.1;
}
autonomous-system 500;
}
protocols {
bgp {# The main router uses BGP as the exterior gateway protocol.
group to_main_ls {
type internal;
local-address 10.255.41.173;
export export_address;
neighbor 10.255.41.179;
neighbor 10.255.41.175;
}
}
ospf {# The main router uses OSPF as the interior gateway protocol.
area 0.0.0.0 {
interface lo0.0;
interface fe-0/0/1.3;
}
}
}
policy-options {
policy-statement export_address {
from {
route-filter 10.255.41.177/32 exact;
}
then accept;
}
}
system {
login {
class ls1–admin {
permissions all;
logical-system ls1;
}
user ls1–admin {
class ls1–admin;
authentication plain-text password;
New password: password
Retype new password: password
}
}
}

On Router P0, configure logical systems LS1, LS2, and the main router. For the logical system, you must configure physical interface properties at the main router [edit interfaces] hierarchy level and assign the logical interfaces to the logical systems. Next, you must configure protocols (such as RSVP, MPLS, BGP, and IS-IS), routing options, and policy options for the logical systems. Last, configure the same logical system administrator for LS1 that you configured on Router PE1. Configure this same logical system administrator for LS2 to have permission to view the LS2 configuration, but not change the configuration for LS2.

In this example, logical system LS1 transports traffic for the red VPN that exists between routers CE1 and CE5. LS1 also connects the blue VPN that exists between routers CE2 and CE6. Logical system LS2 transports VPLS traffic between routers CE3 and CE7.

For the main router on Router P0, you can configure the router as usual. In this example, the main router transports traffic between routers CE4 and CE8. As a result, configure the interfaces and routing protocols (OSPF, BGP) to connect to the main router portion of routers PE1 and PE2.

Router P0

[edit]
logical-systems {
ls1 { # The configuration for the first logical system begins here.
interfaces {
fe-1/1/3 {
unit 1 { # This logical interface connects to LS1 on Router PE1.
description "ls1 interface";
vlan-id 101;
family inet {
address 10.11.2.2/24;
}
family iso;
family mpls;
}
}
so-1/2/0 {
unit 1 { # This logical interface connects to LS1 on Router PE2.
description "ls1 interface";
dlci 101;
family inet {
address 10.11.3.1/24;
}
family iso;
family mpls;
}
}
lo0 {
unit 1 {
description "ls1 loopback";
family inet {
address 10.10.10.11/32;
}
family iso {
address 47.1111.1111.1111.1112.00;
}
}
}
}
protocols { # You configure RSVP, MPLS, and IS-IS for logical system LS1.
rsvp {
interface all;
}
mpls {
interface all;
}
isis {
interface all;
}
}
}
ls2 {# The configuration for the second logical system begins here.
interfaces {
fe-1/1/3 {
unit 0 {# This logical interface connects to LS2 on Router PE1.
description "ls2 interface";
vlan-id 100;
family inet {
address 10.1.2.2/24;
}
family iso;
family mpls;
}
}
so-1/2/0 {
unit 0 {# This logical interface connects to LS2 on Router PE2.
description "ls2 interface";
dlci 100;
family inet {
address 10.1.3.1/24;
}
family iso;
family mpls;
}
}
lo0 {
unit 2 {
description "ls2 loopback";
family inet {
address 10.20.20.21/32;
}
family iso {
address 47.2222.2222.2222.2223.00;
}
}
}
}
protocols { # You configure RSVP, MPLS, and IS-IS for logical system LS2.
rsvp {
interface all;
}
mpls {
interface all;
}
isis {
interface fe-1/1/3.0;
interface so-1/2/0.0;
interface lo0.2;
}
}
}
}
interfaces {
fe-1/1/3 {
vlan-tagging;
unit 3 {# This logical interface connects to the main router on Router PE1.
description "main router interface";
vlan-id 103;
family inet {
address 10.31.2.2/24;
}
family iso;
family mpls;
}
}
so-1/2/0 {
dce; # You must configure all physical interface statements for logical
encapsulation frame-relay; # routers at the [edit interfaces] hierarchy level.
unit 3 { # This logical interface connects to the main router on Router PE2.
description "main router interface";
dlci 103;
family inet {
address 10.31.3.1/24;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
description "main router loopback";
family inet {
address 10.255.41.175/32;
}
}
}
}
routing-options {
autonomous-system 500;
}
protocols { # You configure BGP and OSPF for the main router.
bgp {
group to_main_ls {
type internal;
local-address 10.255.41.175
neighbor 10.255.41.179;
neighbor 10.255.41.173;
}
}
ospf {
area 0.0.0.0 {
interface lo0.0;
interface fe-1/1/3.3;
interface so-1/2/0.3;
}
}
}
system {
login {
class ls1–admin {
permissions all;
logical-system ls1;
}
class ls1–onlooker {
permissions view;
logical-system ls2;
}
user ls1–admin {
class ls1–admin;
}
}
}

On Router PE2, create two VRF routing instances in logical system LS1: red and blue. Configure the CE-facing logical interfaces so that traffic from Router CE5 is placed in the red VPN and traffic from Router CE6 is placed in the blue VPN. Next, create one logical interface on so-1/2/0.1 to connect to logical system LS1 on Router P0.

Also on Router PE2, create a VPLS routing instance in logical system LS2. Configure a logical interface so that traffic from Router CE7 is sent into the VPLS domain and connects to logical system LS2 on Router P0.

Configure a logical interface to interconnect Router CE8 with the main router portion of Router P0.

Finally, you can optionally create a logical system administrator that has configuration privileges for LS1 and viewing privileges for LS2.

Router PE2

[edit]
logical-systems {
ls1 { # The configuration for the first logical system begins here.
interfaces {
fe-0/2/0 {
unit 1 { # This logical interface connects to Router CE5.
description "routing-instance red interface";
vlan-id 101;
family inet {
address 10.11.4.1/24;
}
}
unit 2 { # This logical interface connects to Router CE6.
description "routing-instance blue interface";
vlan-id 102;
family inet {
address 10.21.4.1/24;
}
}
}
so-1/2/0 {
unit 1 {# This is the core-facing interface for logical system LS1.
description "ls1 interface";
dlci 101;
family inet {
address 10.11.3.2/24;
}
family iso;
family mpls;
}
}
lo0 {
unit 1 {
description "ls1 loopback";
family inet {
address 10.10.10.12/32;
}
family iso {
address 47.1111.1111.1111.1113.00;
}
}
}
}
protocols {
rsvp {# You configure RSVP, MPLS, IS-IS, and BGP for logical system LS1.
interface all;
}
mpls {
label-switched-path to_10.10.10.10 {
to 10.10.10.10;
}
interface all;
}
bgp {
group to_other_PE {
type internal;
local-address 10.10.10.12;
family inet {
any;
}
family inet-vpn {
any;
}
neighbor 10.10.10.10;
}
}
isis {
interface all;
}
}
policy-options {
policy-statement from_bgp_to_ospf {
then accept;
}
}
routing-instances {
blue {
instance-type vrf; # You configure instance blue within logical system LS1.
interface fe-0/2/2.0;
route-distinguisher 10.10.10.12:200;
vrf-target target:20:20;
protocols {
bgp { # BGP connects the blue instance with Router CE6.
group to_CE {
local-address 10.21.4.1;
peer-as 300;
neighbor 10.21.4.2;
}
}
}
}
red {
instance-type vrf; # You configure instance red within logical system LS1.
interface fe-0/2/1.0;
route-distinguisher 10.10.10.12:100;
vrf-target target:10:10;
protocols {
ospf { # OSPF connects the red instance with Router CE5.
export from_bgp_to_ospf;
area 0.0.0.0 {
interface all;
}
}
}
}
}
routing-options {
autonomous-system 100;
}
}
logical-systems {
ls2 { # The configuration for the second logical system begins here.
interfaces {
fe-0/2/0 {
unit 0 { # This logical interface connects to Router CE7.
description "vpls interface";
encapsulation vlan-vpls;
vlan-id 600;
family vpls;
}
}
so-1/2/0 {
unit 0 { # This is the core-facing interface for logical system LS2.
description "ls2 interface";
dlci 100;
family inet {
address 10.1.3.2/24;
}
family iso;
family mpls;
}
}
lo0 {
unit 2 {
description "ls2 loopback";
family inet {
address 10.20.20.22/32;
}
family iso {
address 47.2222.2222.2222.2224.00;
}
}
}
}
protocols { # You configure RSVP, MPLS, IS-IS, and BGP for logical system LS2.
rsvp {
interface all;
}
mpls {
label-switched-path to_10.20.20.20 {
to 10.20.20.20;
}
interface all;
}
bgp {
group to_VPLS_PE {
type internal;
local-address 10.20.20.22;
family l2vpn {
signaling;
}
neighbor 10.20.20.20;
}
}
isis {
interface so-1/2/0.0;
interface lo0.2;
}
}
routing-instances {
new {
instance-type vpls; # You configure VPLS within logical system LS2.
interface fe-0/2/0.0;
route-distinguisher 10.20.20.22:100;
vrf-target target:30:30;
protocols {
vpls {
site-range 10;
site newPE {
site-identifier 2;
}
}
}
}
}
routing-options {
autonomous-system 400;
}
}
interfaces {
fe-0/2/0 {   # You must always configure physical interface statements for the
vlan-tagging; # logical system interfaces at the [edit interfaces] hierarchy level.
encapsulation vlan-vpls;
}
fe-0/2/1 {
vlan-tagging;
}
fe-0/2/2 {
vlan-tagging;
}
fe-0/2/3 {
vlan-tagging;
unit 0 { # This logical interface in the main router of PE2 connects to CE8.
description "main router to CE8";
vlan-id 103;
family inet {
address 10.31.4.1/24;
}
}
}
so-1/2/0 {
encapsulation frame-relay;
unit 3 { # This is the core-facing interface for the main router of PE2.
description "main router to P0";
dlci 103;
family inet {
address 10.31.3.2/24;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
description "main router loopback";
family inet {
address 10.155.41.179/32;
}
}
}
}
routing-options {
static {
route 10.255.41.180/32 next-hop 10.31.4.2;
}
autonomous-system 500;
}
protocols {
bgp {# The main router uses BGP as the exterior gateway protocol.
group to_main_ls {
type internal;
local-address 10.255.41.179;
export export_address;
neighbor 10.255.41.173;
neighbor 10.255.41.175;
}
}
ospf {# The main router uses OSPF as the interior gateway protocol.
area 0.0.0.0 {
interface so-1/2/0.3;
interface fe-0/2/3.0;
interface lo0.0;
}
}
}
policy-options {
policy-statement export_address {
from {
route-filter 10.255.41.180/32 exact;
}
then accept;
}
}
}
system {
login {
class ls1–admin {
permissions all;
logical-system ls1;
}
class ls1–onlooker {
permissions view;
logical-system ls2;
}
user ls1–admin {
class ls1–admin;
}
}
}

On Router CE5, configure OSPF to connect to the red VPN in logical system LS1 on Router PE2:

Router CE5

[edit]
interfaces {
fe-0/3/1 {
vlan-tagging;
unit 0 {
description "routing-instance red CE";
vlan-id 101;
family inet {
address 10.11.4.2/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.11.4.100/32;
}
}
}
}
protocols {
ospf {
area 0.0.0.0 {
interface fe-0/3/1.0;
interface lo0.0;
}
}
}
system {
login {
class ls1–admin {
permissions all;
logical-system ls1;
}
class ls1–onlooker {
permissions view;
logical-system ls2;
}
user ls1–admin {
class ls1–admin;
}
}
}

On Router CE6, configure BGP to connect to the blue VPN in logical system LS1 on Router PE2:

Router CE6

[edit]
interfaces {
fe-0/3/2 {
vlan-tagging;
unit 0 {
description "routing-instance blue CE";
vlan-id 102;
family inet {
address 10.21.4.2/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.21.4.100/32;
}
}
}
}
routing-options {
autonomous-system 300;
}
protocols {
bgp {
export export_loopback;
group to_PE {
type external;
local-address 10.21.4.2;
peer-as 100;
neighbor 10.21.4.1;
}
}
}
policy-options {
policy-statement export_loopback {
from {
route-filter 10.21.4.100/32 exact;
}
then accept;
}
}

On Router CE7, configure the Fast Ethernet interface in VLAN 600 to connect with the VPLS routing instance in logical system LS2 on Router PE2:

Router CE7

[edit]
interfaces {
fe-0/3/0 {
vlan-tagging;
unit 0 {
description "vpls interface";
vlan-id 600;
family inet {
address 10.1.1.2/24;
}
}
}
}

On Router CE8, configure the Fast Ethernet interface to connect with the main router at Router PE2:

Router CE8

[edit]
interfaces {
fe-0/3/3 {
vlan-tagging;
unit 0 {
description "main router interface";
vlan-id 103;
family inet {
address 10.31.4.2/24;
}
}
}
}
lo0 {
unit 0 {
family inet {
address 10.255.41.180/32;
}
}
}
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