Configuration Prerequisites - HP FlexNetwork 7500 Series Configuration Manual

Configuration prerequisites

Before you configure BGP MDT, complete the following tasks:
•
Configure MPLS L3VPN on the public network.
•
Configure basic BGP functions on the public network.
•
Configure the PIM-SSM on the public network.
•
Determine the IP addresses of the MDT peers.
•
Determine the cluster IDs of the route reflectors.
Enabling 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 the 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 BGP MDT peers or peer groups:
Step
Enter system view.
1.
Enter BGP view.
2.
Create a BGP IPv4
3.
MDT address family
and enter its view.
Enable the MDT
4.
routing information
exchanging capability
between local routers
and their BGP peers
or peer groups.
Configuring a BGP MDT route reflector
BGP MDT peers in the same AS must be fully meshed to maintain connectivity. However, when
many BGP MDT peers exist in an AS, connection establishment among them might result in
increased costs. To reduce connections between them, 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. 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. You must configure the same cluster ID for them to avoid routing loops.
Command
system-view
bgp as-number
address-family ipv4 mdt
peer { group-name | ip-address
[ mask-length ] } enable
197
Remarks
N/A
N/A
By default, BGP IPv4 address families
do not exist.
By default, local routers cannot
exchange BGP MDT routing
information with their peers or peer
groups.
IMPORTANT:
Before you configure this command,
you must create BGP peers or peer
groups in BGP view. For more
information, see Layer 3—IP Routing
Configuration Guide.