199
•
Configure basic BGP functions on the public network.
•
Configure PIM-SSM on the public network.
•
Determine the IP addresses of the MDT peers.
•
Determine the cluster IDs of the route reflectors.
Configuring BGP MDT peers or peer groups
Configure a BGP MDT peer or peer group on a PE router in BGP IPv4 MDT address family view.
Then, the PE router can exchange MDT information with the BGP peer or peer group. MDT
information includes the IP address of the PE and default-group to which the PE belongs. On a public
network running PIM-SSM, the multicast VPN establishes a default-MDT rooted at the PE (multicast
source) based on the MDT information.
Perform this task on PE devices.
To configure a BGP MDT peer or peer group on a PE router:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP instance view.
bgp
as-number
[
instance
instance-name
]
N/A
3.
Create a BGP IPv4 MDT
address family and enter its
view.
address-family ipv4 mdt
By default, no BGP IPv4 address
family exists.
4.
Enable
the device to
exchange MDT routing
information with the BGP
peer or the peer group.
peer
{
group-name
|
ip-address
[
mask-length
] }
enable
By default, the router cannot
exchange BGP MDT routing
information with a BGP peer or
peer group.
For more information about this
command, see
Layer 3—IP
Routing Configuration Guide
.
IMPORTANT:
Before you configure this
command, you must create a
BGP peer or peer group in BGP
instance view. For more
information, see
Layer 3—IP
Routing Configuration Guide
.
Configuring a BGP MDT route reflector
BGP MDT peers in the same AS must be fully meshed to maintain connectivity. However, when
multiple BGP MDT peers exist in an AS, connection establishment among them might result in
increased costs. To reduce connections between BGP MDT peers, you can configure one of them as
a route reflector and specify other routers as clients.
When clients establish BGP MDT connections with the route reflector, the route reflector forwards (or
reflects) BGP MDT routing information between clients. The clients are not required to be fully
meshed. To save bandwidth if the clients have been fully meshed, you can disable the routing
reflection between clients by using the
undo reflect between-clients
command.
The route reflector and its clients form a cluster. Typically, a cluster has only one route reflector
whose router ID identifies the cluster. However, you can configure several route reflectors in a cluster
