Example: Multicast with Interprovider VPNs
Interprovider VPNs are also mentioned in RFC 2547. An example is shown in Figure 18. The topology is slightly different; the main difference is the addition of Multicast Source Discovery Protocol (MSDP) between two provider core transit (P) routers. In this limited topology, each P router is an SP-RP for the local autonomous system (AS), and router CE1 is the VPN-RP. VPN-A is the name of the routing instance on routers PE0 and PE1.
CE0
[edit]
protocols {
pim {
dense-groups {
229.0.0.0/8;
}
rp {
static {
address 10.254.14.132;
}
}
interface all {
mode sparse-dense;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
PE0
[edit]
protocols {
pim {
rp {
static {
address 10.254.71.49;
}
}
interface all {
mode sparse;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
routing-instances {
VPN-A {
protocols {
pim {
dense-groups {
229.0.0.0/8;
}
vpn-group-address 239.1.1.1;
rp {
static {
address 10.254.14.132;
}
}
interface t1-1/0/0:0.0 {
mode sparse-dense;
version 2;
}
interface lo0.1 {
mode sparse-dense;
version 2;
}
}
}
}
}
P0
[edit]
protocols {
...
msdp {
peer 10.254.71.48 {
local-address 10.254.71.49;
}
}
...
pim {
rp {
local {
address 10.254.71.49;
}
}
interface all {
mode sparse;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
P1
[edit]
protocols {
...
msdp {
peer 10.254.71.49 {
local-address 10.254.71.48;
}
}
...
pim {
rp {
local {
address 10.254.71.48;
}
}
interface all {
mode sparse;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
PE1
[edit]
protocols {
pim {
rp {
static {
address 10.254.71.48;
}
}
interface all {
mode sparse;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
routing-instances {
VPN-A {
protocols {
pim {
dense-groups {
229.0.0.0/8;
}
vpn-group-address 239.1.1.1;
rp {
static {
address 10.254.14.132;
}
}
interface t1-1/0/0:0.0 {
mode sparse-dense;
version 2;
}
interface lo0.1 {
mode sparse-dense;
version 2;
}
}
}
}
}
CE1
[edit]
protocols {
pim {
dense-groups {
229.0.0.0/8;
}
rp {
local {
address 10.254.14.132;
}
}
interface all {
mode sparse-dense;
version 2;
}
interface fxp0.0 {
disable;
}
}
}