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expenses. To reduce connections between them, you can configure one of them as a route reflector
and specify other routers as clients. The clients establish BGP MDT connections with the route
reflector, and the route reflector forwards (reflects) BGP MDT routing information between clients. In
this way, the clients need not to be fully meshed. Furthermore, you can disable client-to-client
reflection to reduce overloads if the clients have been fully meshed.
The route reflector and its clients form a cluster. In general, a cluster has only one route reflector
whose router ID identifies the cluster. However, you can configure several route reflectors in a cluster
to improve network reliability, and they must have the same cluster ID configured to avoid routing
loops.
Perform the following configuration on the PE.
To configure a BGP MDT route reflector:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP view.
bgp
as-number
N/A
3.
Enter BGP MDT
sub-address family view.
ipv4-family mdt
N/A
4.
Configure the local device as
a route reflector and specify
its clients.
peer
{
group-name
|
ip-address
}
reflect-client
By default, neither route reflectors
nor clients exist.
5.
Disable route reflection
between clients.
undo reflect between-clients
Optional.
Enabled by default.
6.
Configure the cluster ID of
the route reflector.
reflector cluster-id
{
cluster-id
|
ip-address
}
Optional.
By default, a route reflector uses its
router ID as the cluster ID.
Specifying the source IP address for multicast
across VPNs
To implement multicast across VPNs, you must specify the source IP address for multicast across
VPNs.
Configuration prerequisites
Before you perform this configuration, complete the following tasks:
•
Create a VPN instance on each PE and specify the share-group.
•
Create the receivers' VPN instances on the source-side PE, and
{
For source-side PE configuration, specify the share-group.
{
For receiver-side PE configuration, create the multicast source's VPN instance on the
receiver-side PE and specify the share-group.
•
Configure the RD in all VPN instances on the PEs and enable IP multicasting.
•
Configure the same PIM mode (PIM-SM, BIDIR-PIM, or PIM-SSM) in the multicast source's
VPN and the receivers' VPNs.
•
Determine the IP addresses of the multicast source and RP, and their home VPN instances.
