Example: Basic Multicast over a Layer 3 VPN Configuration
In Figure 17, the multicast source sends to group 229.1.1.1, and the receiver listens to the same group address. The VPN-RP is located at router CE1, while the SP-RP is located at router P0. The routing instances are named VPN-A on both routers PE0 and PE1.
CE0
[edit]
protocols {
pim {
rp{
dense-groups {
229.0.0.0/8;
}
static {
address 10.254.245.91;
}
}
interface all {
mode sparse-dense;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
In this example, the statement interface all is configured. If the topology requires only a few interfaces to be configured for PIM, then loopback interface lo0 must also be one of the configured interfaces.
PE0
[edit]
protocols {
pim {
rp {
static {
address 10.254.71.47;
}
}
interface all {
mode sparse;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
Router PE0 also requires a standard VPN configuration, along with the PIM instance configuration. The vpn-group-address command is the only new PIM option with PIM used exclusively with a routing instance multicast configuration.
[edit]
routing-instances {
VPN-A {
instance-type vrf;
interface t1-0/3/0:0.0;
interface lo0.1
route-distinguisher 10.254.71.46:100;
vrf-import VPNA-import;
vrf-export VPNA-export;
protocols {
ospf {
export bgp-to-ospf;
area 0.0.0.0 {
interface t1-0/3/0:0.0;
interface lo0.1;
}
}
pim {
dense-groups {
229.0.0.0/8;
}
vpn-group-address 239.1.1.1;
rp {
static {
address 10.254.245.91;
}
}
interface t1-0/3/0:0.0 {
mode sparse-dense;
version 2;
}
interface lo0.1 {
mode sparse-dense;
version 2;
}
}
}
}
P0
[edit]
protocols {
pim {
rp {
local {
address 10.254.71.47;
}
}
interface all {
mode sparse;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
Again, if the configuration calls for specific interfaces to be configured for PIM, loopback interface lo0 must be included as one of the interfaces running PIM.
PE1
[edit]
protocols {
pim {
rp {
static {
address 10.254.71.47;
}
}
interface all {
mode sparse;
version 2;
}
interface fxp0.0 {
disable;
}
}
}
routing-instances {
VPN-A {
instance-type vrf;
interface t1-1/0/0:0.0;
interface lo0.1;
route-distinguisher 10.254.71.51:100;
vrf-import VPNA-import;
vrf-export VPNA-export;
protocols {
ospf {
export bgp-to-ospf;
area 0.0.0.0 {
interface t1-1/0/0:0.0;
interface lo0.1;
}
}
pim {
dense-groups {
229.0.0.0/8;
}
vpn-group-address 239.1.1.1;
rp {
static {
address 10.254.245.91;
}
}
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 10.254.245.91;
}
}
interface all {
mode sparse-dense;
version 2;
}
interface fxp0.0 {
disable;
}
}
}