Configuring Bgp Rt Filtering; About Bgp Rt Filtering - HP FlexNetwork 10500 Series Configuration Manual

Step
4. Set the backup next hop
for FRR.
5. Return to system view.
6. Enter BGP instance view.
7. (Optional.) Use
echo-mode BFD to detect
the connectivity to the
next hop of the primary
route.
8. Enter BGP-VPN instance
view.
9. Enter BGP-VPN IPv4
unicast address family
view.
10. Enable MPLS L3VPN
FRR.

Configuring BGP RT filtering

About BGP RT filtering

The BGP RT filtering feature reduces the number of routes advertised in an MPLS L3VPN.
After RT filtering is configured, a PE advertises its import target attribute to the peer PEs in the RT
filter address family. The peer PEs use the received import target attribute to filter routes and
advertise only the routes that match the attribute to the PE.
When a large number of IBGP peers exist, the BGP RT filtering and the route reflection features are
used together as a best practice. Route reflection reduces the number of IBGP connections. BGP RT
filtering reduces the number of routes advertised in the network.
Command
apply fast-reroute
backup-nexthop ip-address
quit
bgp as-number [ instance
instance-name ]
primary-path-detect bfd echo
ip vpn-instance
vpn-instance-name
address-family ipv4 [ unicast ]
•
(Method 1) Enable MPLS
L3VPN FRR for the address
family:
pic
•
(Method 2) Use a routing policy
to specify a backup next hop for
the address family:
fast-reroute route-policy
route-policy-name
219
Remarks
By default, no backup next hop
address is set for FRR.
This step is required to enable
MPLS L3VPN FRR in Method 2.
For more information about this
command, see Layer 3—IP
Routing Command Reference.
N/A
N/A
By default, ARP is used to detect
the connectivity to the next hop.
Use this command if necessary in
VPNv4 route backup an IPv4 route.
For more information about this
command, see Layer 3—IP
Routing Command Reference.
N/A
N/A
By default, MPLS L3VPN FRR is
disabled.
Method 1 might result in routing
loops. Use it with caution.
By default, no routing policy is
used.
The apply fast-reroute
backup-nexthop command can
take effect in the routing policy that
is being used. Other apply
commands do not take effect.
For more information about the
command, see Layer 3—IP
Routing Command Reference.