Implementation Description
In this article, I will build an Interprovider L3VPN Option A setup on a single vMX. Each individual router will be configured as a logical router. The vMX router has a back-to-back connection between ge-0/0/0 and ge-0/0/1 ports. For each different link, a different VLAN number will be configured to separate the traffic generated based on router ID number.
Network Diagram
IP Allocation
- AS 20: 192.168.20.0/16
- CE 21: 192.168.0.21/32
- CE 22: 192.168.0.22/32
- Link 1121: 192.168.20.0/31
- Link 1622: 192.168.20.2/31
- AS 30: 192.168.30.0/16
- CE 31: 192.168.0.31/32
- CE 32: 192.168.0.32/32
- Link 1131: 192.168.30.0/31
- Link 1632: 192.168.30.2/31
- AS 100: 10.100.0.0/16
- PE 11: 10.100.0.11/32
- P 12: 10.100.0.12/32
- ASBR 13: 10.100.0.13/32
- Internal Links: 10.100.1.0/16
- AS 200: 10.200.0.0/16
- PE 16: 10.200.0.16/32
- P 15: 10.200.0.15/32
- ASBR 14: 10.200.0.14/32
- Internal Links: 10.200.1.0/16
- Inter-ASBR links:
- Link 20: 172.167.20.0/31
- LInk 30: 172.167.30.0/31
Full Configuration
## Last changed: 2018-03-06 12:52:17 UTC
version 15.1F4.15;
groups {
isis {
logical-systems {
<*> {
protocols {
isis {
level 1 disable;
interface <*> {
point-to-point;
}
}
}
}
}
}
}
apply-groups isis;
system {
host-name MX;
root-authentication {
encrypted-password "$5$L3F31155$kVyagZl2v/WM9s32/hi7VCXxM5o0vupYD.LO3uvCif4"; ## SECRET-DATA
}
services {
ssh;
netconf {
ssh;
}
}
syslog {
user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file interactive-commands {
interactive-commands any;
}
}
}
logical-systems {
11-PE {
interfaces {
ge-0/0/0 {
unit 1112 {
vlan-id 1112;
family inet {
address 10.100.1.0/31;
}
family iso;
family mpls;
}
unit 1121 {
vlan-id 1121;
family inet {
address 192.168.20.0/31;
}
}
unit 1131 {
vlan-id 1131;
family inet {
address 192.168.30.0/31;
}
}
}
lo0 {
unit 11 {
family inet {
address 10.100.0.11/32;
}
family iso {
address 49.0100.0101.0000.0011.00;
}
}
}
}
protocols {
mpls {
interface all;
}
bgp {
group internal {
type internal;
local-address 10.100.0.11;
family inet-vpn {
any;
}
neighbor 10.100.0.13;
}
}
isis {
interface ge-0/0/0.1112;
interface lo0.11;
}
ldp {
interface all;
}
}
routing-instances {
Cust-20 {
instance-type vrf;
interface ge-0/0/0.1121;
route-distinguisher 10.100.0.11:20;
vrf-target target:100:20;
protocols {
bgp {
group to-Cust {
type external;
peer-as 20;
as-override;
neighbor 192.168.20.1;
}
}
}
}
Cust-30 {
instance-type vrf;
interface ge-0/0/0.1131;
route-distinguisher 10.100.0.11:30;
vrf-target target:100:30;
protocols {
bgp {
group to-Cust {
type external;
peer-as 30;
as-override;
neighbor 192.168.30.1;
}
}
}
}
}
routing-options {
autonomous-system 100;
}
}
12-P {
interfaces {
ge-0/0/0 {
unit 1213 {
vlan-id 1213;
family inet {
address 10.100.1.2/31;
}
family iso;
family mpls;
}
}
ge-0/0/1 {
unit 1112 {
vlan-id 1112;
family inet {
address 10.100.1.1/31;
}
family iso;
family mpls;
}
}
lo0 {
unit 12 {
family inet {
address 10.100.0.12/32;
}
family iso {
address 49.0100.0101.0000.0012.00;
}
}
}
}
protocols {
mpls {
interface all;
}
isis {
interface all;
}
ldp {
interface all;
}
}
routing-options {
autonomous-system 100;
}
}
13-ASBR {
interfaces {
ge-0/0/0 {
unit 20 {
vlan-id 20;
family inet {
address 172.167.20.0/31;
}
}
unit 30 {
vlan-id 30;
family inet {
address 172.167.30.0/31;
}
}
}
ge-0/0/1 {
unit 1213 {
vlan-id 1213;
family inet {
address 10.100.1.3/31;
}
family iso;
family mpls;
}
}
lo0 {
unit 13 {
family inet {
address 10.100.0.13/32;
}
family iso {
address 49.0100.0101.0000.0013.00;
}
}
}
}
protocols {
mpls {
interface all;
}
bgp {
group internal {
type internal;
local-address 10.100.0.13;
family inet-vpn {
any;
}
neighbor 10.100.0.11;
}
}
isis {
interface all;
}
ldp {
interface all;
}
}
routing-instances {
Cust-20 {
instance-type vrf;
interface ge-0/0/0.20;
route-distinguisher 10.100.0.13:20;
vrf-target target:100:20;
protocols {
bgp {
group to-AS200 {
type external;
peer-as 200;
neighbor 172.167.20.1;
}
}
}
}
Cust-30 {
instance-type vrf;
interface ge-0/0/0.30;
route-distinguisher 10.100.0.13:30;
vrf-target target:100:30;
protocols {
bgp {
group to-AS200 {
type external;
peer-as 200;
neighbor 172.167.30.1;
}
}
}
}
}
routing-options {
autonomous-system 100;
}
}
14-ASBR {
interfaces {
ge-0/0/0 {
unit 1415 {
vlan-id 1415;
family inet {
address 10.200.1.4/31;
}
family iso;
family mpls;
}
}
ge-0/0/1 {
unit 20 {
vlan-id 20;
family inet {
address 172.167.20.1/31;
}
}
unit 30 {
vlan-id 30;
family inet {
address 172.167.30.1/31;
}
}
}
lo0 {
unit 14 {
family inet {
address 10.200.0.14/32;
}
family iso {
address 49.0200.0102.0000.0014.00;
}
}
}
}
protocols {
mpls {
interface all;
}
bgp {
group internal {
type internal;
local-address 10.200.0.14;
family inet-vpn {
any;
}
neighbor 10.200.0.16;
}
}
isis {
interface all;
}
ldp {
interface all;
}
}
routing-instances {
Cust-20 {
instance-type vrf;
interface ge-0/0/1.20;
route-distinguisher 10.200.0.13:20;
vrf-target target:200:20;
protocols {
bgp {
group to-AS100 {
type external;
peer-as 100;
neighbor 172.167.20.0;
}
}
}
}
Cust-30 {
instance-type vrf;
interface ge-0/0/1.30;
route-distinguisher 10.200.0.14:30;
vrf-target target:200:30;
protocols {
bgp {
group to-AS100 {
type external;
peer-as 100;
neighbor 172.167.30.0;
}
}
}
}
}
routing-options {
autonomous-system 200;
}
}
15-P {
interfaces {
ge-0/0/0 {
unit 1516 {
vlan-id 1516;
family inet {
address 10.200.1.6/31;
}
family iso;
family mpls;
}
}
ge-0/0/1 {
unit 1415 {
vlan-id 1415;
family inet {
address 10.200.1.5/31;
}
family iso;
family mpls;
}
}
lo0 {
unit 15 {
family inet {
address 10.200.0.15/32;
}
family iso {
address 49.0100.0102.0000.0015.00;
}
}
}
}
protocols {
mpls {
interface all;
}
isis {
interface all;
}
ldp {
interface all;
}
}
}
16-PE {
interfaces {
ge-0/0/0 {
unit 1622 {
vlan-id 1622;
family inet {
address 192.168.20.2/31;
}
}
unit 1632 {
vlan-id 1632;
family inet {
address 192.168.30.2/31;
}
}
}
ge-0/0/1 {
unit 1516 {
vlan-id 1516;
family inet {
address 10.200.1.7/31;
}
family iso;
family mpls;
}
}
lo0 {
unit 16 {
family inet {
address 10.200.0.16/32;
}
family iso {
address 49.0200.0102.0000.0016.00;
}
}
}
}
protocols {
mpls {
interface all;
}
bgp {
group internal {
type internal;
local-address 10.200.0.16;
family inet-vpn {
any;
}
neighbor 10.200.0.14;
}
}
isis {
interface all;
}
ldp {
interface all;
}
}
routing-instances {
Cust-20 {
instance-type vrf;
interface ge-0/0/0.1622;
route-distinguisher 10.100.0.16:20;
vrf-target target:200:20;
protocols {
bgp {
group to-Cust {
type external;
peer-as 20;
as-override;
neighbor 192.168.20.3;
}
}
}
}
Cust-30 {
instance-type vrf;
interface ge-0/0/0.1632;
route-distinguisher 10.100.0.16:30;
vrf-target target:200:30;
protocols {
bgp {
group to-Cust {
type external;
peer-as 30;
as-override;
neighbor 192.168.30.3;
}
}
}
}
}
routing-options {
autonomous-system 200;
}
}
21-CE {
interfaces {
ge-0/0/1 {
unit 1121 {
vlan-id 1121;
family inet {
address 192.168.20.1/31;
}
}
}
lo0 {
unit 21 {
family inet {
address 192.168.0.21/32;
}
}
}
}
protocols {
bgp {
group AS100 {
type external;
export to-bgp;
peer-as 100;
neighbor 192.168.20.0;
}
}
}
policy-options {
policy-statement to-bgp {
from protocol direct;
then accept;
}
}
routing-options {
autonomous-system 20;
}
}
22-CE {
interfaces {
ge-0/0/1 {
unit 1622 {
vlan-id 1622;
family inet {
address 192.168.20.3/31;
}
}
}
lo0 {
unit 22 {
family inet {
address 192.168.0.22/32;
}
}
}
}
protocols {
bgp {
group AS200 {
type external;
export to-bgp;
peer-as 200;
neighbor 192.168.20.2;
}
}
}
policy-options {
policy-statement to-bgp {
from protocol direct;
then accept;
}
}
routing-options {
autonomous-system 20;
}
}
31-CE {
interfaces {
ge-0/0/1 {
unit 1131 {
vlan-id 1131;
family inet {
address 192.168.30.1/31;
}
}
}
lo0 {
unit 31 {
family inet {
address 192.168.0.31/32;
}
}
}
}
protocols {
bgp {
group AS100 {
type external;
export to-bgp;
peer-as 100;
neighbor 192.168.30.0;
}
}
}
policy-options {
policy-statement to-bgp {
from protocol direct;
then accept;
}
}
routing-options {
autonomous-system 30;
}
}
32-CE {
interfaces {
ge-0/0/1 {
unit 1632 {
vlan-id 1632;
family inet {
address 192.168.30.3/31;
}
}
}
lo0 {
unit 32 {
family inet {
address 192.168.0.32/32;
}
}
}
}
protocols {
bgp {
group AS200 {
type external;
export to-bgp;
peer-as 200;
neighbor 192.168.30.2;
}
}
}
policy-options {
policy-statement to-bgp {
from protocol direct;
then accept;
}
}
routing-options {
autonomous-system 30;
}
}
}
interfaces {
ge-0/0/0 {
description "to ge-0/0/1";
vlan-tagging;
}
ge-0/0/1 {
description "to ge-0/0/0";
vlan-tagging;
}
ge-0/0/2 {
description "to ge-0/0/3";
vlan-tagging;
}
ge-0/0/3 {
description "to ge-0/0/2";
vlan-tagging;
}
ge-0/0/4 {
description "to ge-0/0/5";
vlan-tagging;
}
ge-0/0/5 {
description "to ge-0/0/4";
vlan-tagging;
}
ge-0/0/6 {
description "to ge-0/0/7";
vlan-tagging;
}
ge-0/0/7 {
description "to ge-0/0/6";
vlan-tagging;
}
ge-0/0/8 {
description "to eth1";
}
ge-0/0/9 {
description "to eth2";
}
fxp0 {
unit 0 {
family inet {
address 192.168.83.11/24;
}
}
}
}
Verification
[edit]
root@MX:21-CE# run show route
inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
172.167.20.0/31 *[BGP/170] 00:04:04, localpref 100
AS path: 100 I, validation-state: unverified
> to 192.168.20.0 via ge-0/0/1.1121
192.168.0.21/32 *[Direct/0] 04:10:00
> via lo0.21
192.168.0.22/32 *[BGP/170] 00:04:04, localpref 100
AS path: 100 200 100 I, validation-state: unverified
> to 192.168.20.0 via ge-0/0/1.1121
192.168.20.0/31 *[Direct/0] 04:09:08
> via ge-0/0/1.1121
192.168.20.1/32 *[Local/0] 04:09:08
Local via ge-0/0/1.1121
192.168.20.2/31 *[BGP/170] 00:04:04, localpref 100
AS path: 100 200 I, validation-state: unverified
> to 192.168.20.0 via ge-0/0/1.1121
[edit]
root@MX:21-CE# run ping 192.168.0.22 count 3 source 192.168.0.21
PING 192.168.0.22 (192.168.0.22): 56 data bytes
64 bytes from 192.168.0.22: icmp_seq=0 ttl=52 time=9.114 ms
64 bytes from 192.168.0.22: icmp_seq=1 ttl=52 time=10.155 ms
64 bytes from 192.168.0.22: icmp_seq=2 ttl=52 time=8.088 ms
--- 192.168.0.22 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max/stddev = 8.088/9.119/10.155/0.844 ms
Label Operation
1. Customer router will send simple traffic.
root@MX:21-CE> show route 192.168.0.22
inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.22/32 *[BGP/170] 00:10:08, localpref 100
AS path: 100 200 100 I, validation-state: unverified
> to 192.168.20.0 via ge-0/0/1.1121
2. Router 11-PE will add two labels to the traffic, L3VPN label and LDP transport label.
root@MX:11-PE> show route 192.168.0.22
Cust-20.inet.0: 6 destinations, 7 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.22/32 *[BGP/170] 00:11:04, localpref 100, from 10.100.0.13
AS path: 200 20 I, validation-state: unverified
> to 10.100.1.1 via ge-0/0/0.1112, Push 299808, Push 299792(top)
3. Router 12-P is PHP and will pop the LDP label.
root@MX:12-P> show route 192.168.0.22
root@MX:12-P> show route label 299792
mpls.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
299792 *[LDP/9] 02:34:46, metric 1
> to 10.100.1.3 via ge-0/0/0.1213, Pop
299792(S=0) *[LDP/9] 02:34:46, metric 1
> to 10.100.1.3 via ge-0/0/0.1213, Pop
4. Router 13-ASBR will pop L3VPN label and will forward simple traffic on the dedicated circuit.
root@MX:13-ASBR> show route 192.168.0.22
Cust-20.inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.22/32 *[BGP/170] 00:14:39, localpref 100
AS path: 200 20 I, validation-state
5. Router 14-ASBR will add two labels to the traffic, L3VPN label and LDP transport label.
root@MX:14-ASBR> show route 192.168.0.22
Cust-20.inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.22/32 *[BGP/170] 00:16:04, localpref 100, from 10.200.0.16
AS path: 20 I, validation-state: unverified
> to 10.200.1.5 via ge-0/0/0.1415, Push 299808, Push 299792(top)
6. Router 15-P is PHP and will pop the LDP label.
root@MX:15-P> show route 192.168.0.22
root@MX:15-P> show route label 299792
mpls.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
299792 *[LDP/9] 00:23:26, metric 1
> to 10.200.1.7 via ge-0/0/0.1516, Pop
299792(S=0) *[LDP/9] 00:23:26, metric 1
> to 10.200.1.7 via ge-0/0/0.1516, Pop
7. Router 16-PE will pop L3VPN label and will forward simple traffic to the end customer.
root@MX:16-PE> show route 192.168.0.22
Cust-20.inet.0: 6 destinations, 7 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.22/32 *[BGP/170] 00:19:35, localpref 100
AS path: 20 I, validation-state: unverified
> to 192.168.20.3 via ge-0/0/0.1622
The Factors that Limit the Scalability of this Method
- All inter-AS VPN routes (potentially a very large number) must be stored in the BGP RIBs and IP routing tables on the AS boundary routers.
- You must configure VRFs on each AS boundary router.