Configuring Inter-As Vpn; Configuring Inter-As Option A - HP HSR6800 Configuration Manual

•
Soft GRE—Used when no public tunnel exists or the existing public tunnels do not meet tunnel
policy requirements.
Soft GRE encapsulates VPN packets with a GRE header and then an IP header. The
destination IP address of the IP header is the IP address of the remote PE (BGP VPNv4 peer).
The source IP address is the output interface address by default. You can use the mpls l3vpn
soft-gre sourcecommand to specify a source IP address.
•
Public tunnel—Used when a qualified public tunnel exists.
To ensure that PEs identify and receive VPN packets correctly, you can specify a key for soft GRE. A
PE accepts the received VPN packets when it is configured with the same key as the remote PE.
Otherwise, the PE drops the packets.
To configure soft GRE:
Step
19. Enter system view.
20. Enter MPLS view.
21. Enable soft GRE.
22. (Optional.) Configure a key
for soft GRE.
23. (Optional.)
source address for soft
GRE.

Configuring inter-AS VPN

If the MPLS backbone on which the VPN routes rely spans multiple ASs, you must configure inter-AS
VPN.
Three inter-AS VPN solutions are available. You can choose them as required.
Before you configure an inter-AS VPN, complete the following tasks:
•
Configure an IGP for the MPLS backbones in each AS to implement IP connectivity of the
backbones in the AS.
•
Configure basic MPLS for the MPLS backbones of each AS.
•
Configure MPLS LDP for the MPLS backbones so that LDP LSPs can be established.
•
Configure basic MPLS L3VPN for each AS.
When configuring basic MPLS L3VPN for each AS, specific configurations may be required on PEs
or ASBR PEs. This depends on the inter-AS VPN solution selected.

Configuring inter-AS option A

Inter-AS option A applies to scenarios where the number of VPNs and that of VPN routes on the PEs
are relatively small. It is simple to implement.
To configure inter-AS option A, complete the following tasks:
•
Configure basic MPLS L3VPN on each AS.
•
Configure each ASBR-PE, taking the peer ASBR-PE as its CE.
Command
system-view
mpls
mpls l3vpnsoft-gre
mpls l3vpn soft-gre keykey-number
Configure a
mpls l3vpn soft-gre
sourceip-address
274
Remarks
N/A
N/A
By default, soft GRE is
disabled.
By default, no key is
configured for soft GRE.
By default, soft GRE uses the
primary IP address of the
output interface as the source
address.