Ecmp Vpn Route Redistribution; Protocols And Standards; Restrictions And Guidelines For Mpls L3Vpn; Mpls L3Vpn Configuration Task List - HP FlexNetwork 10500 Series Configuration Manual

ECMP VPN route redistribution

This feature enables a VPN instance to redistribute all routes that have the same prefix and RD into
its routing table. Based on the ECMP routes, the device can perform load sharing (as configured by
the balance command) or MPLS L3VPN FRR. For more information about the balance command,
see BGP in Layer 3—IP Routing Command Reference.
Figure 63 Network diagram
VPN 1
As shown in
on PE 1. The RD of VPN instance VPN1 is 1:1. CE 2 accesses the backbone network through VPN
instances created on PE 2 and PE 3. The VPN instances created on PE 2 and PE 3 have the same
name VPN2 and the same RD 1:2. VPN instances VPN1 and VPN2 can communicate with each
other.
Both PE 2 and PE 3 can advertise routes from CE 2 to PE 1, and the advertised routes have the
same RD 1:2. By default, BGP redistributes only the optimal route into the routing table of VPN
instance VPN1. After you enable this feature on VPN instance VPN1, BGP redistributes routes from
both PE 2 and PE 3 to the routing table of VPN instance VPN1.

Protocols and standards

•
RFC 3107, Carrying Label Information in BGP-4
•
RFC 4360, BGP Extended Communities Attribute
•
RFC 4364, BGP/MPLS IP Virtual Private Networks (VPNs)
•
RFC 4577, OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private
Networks (VPNs)

Restrictions and guidelines for MPLS L3VPN

MPLS L3VPN is mutually exclusive with EVI and VXLAN. For more information about EVI and
VXLAN, see EVI Configuration Guide and VXLAN Configuration Guide.

MPLS L3VPN configuration task list

Tasks at a glance
(Required.)
PE 1
CE 1
Figure 63, CE 1 accesses the backbone network through VPN instance VPN1 created
Configuring basic MPLS L3VPN
PE 2
MPLS
backbone
PE 3
201
VPN 2
CE 2