Specifying The Vpn Label Processing Mode; Configuring Bgp As Number Substitution And Soo; Configuration Prerequisites; Configuration Procedure - HP 12500 Series Configuration Manual

Specifying the VPN label processing mode

The VPN label processing mode of an egress PE can be either of the following:
POPGO forwarding: Pop the label, and then search for the outbound interface according to the
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label and forward the packet out the interface.
POP forwarding: Pop the label, and then search the FIB to find the outbound interface and forward
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the packet out the interface.
To specify the VPN label processing mode on an egress PE:
To do...
Enter system view
Specify the VPN label processing
mode as POPGO forwarding
NOTE:
To add two switches to an IRF fabric, configure the same VPN label processing mode (POPGO by using
•
vpn popgo or POP by using undo vpn popgo) for the two switches. Otherwise, the two switches cannot
form an IRF fabric. For more information about IRF, see
After you execute the vpn popgo command, you must reboot the switch to validate the configuration.
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After the command is executed successfully, the switch does not inform you of the current VPN label
processing mode. You can use the display vpn label operation command to view the current VPN label
processing mode.

Configuring BGP AS number substitution and SoO

Configuration prerequisites

Before configuring BGP AS number substitution and SoO, complete the following tasks:
Configure basic MPLS L3VPN
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Ensure CEs at different sites to have the same AS number
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Configuration procedure

When CEs at different sites have the same AS number, you need to configure the BGP AS number
substitution function to avoid route loss.
With the BGP AS number substitution function, when a PE advertises a route to the specified peer (CE),
if an AS number identical to that of the CE exist in the AS_PATH of the route, it will be replaced with that
of the PE before the route is advertised.
If the PE connects to multiple CEs in the same site, use a routing policy to add the SoO attribute to the
routes received from the CEs.
Use the command...
system-view
vpn popgo
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Remarks
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Required
POP forwarding by default
IRF Configuration Guide
.