Huawei AR1200 Series - Optional) Enabling Next-Hop-Based Label Allocation on the ASBR

The MPLS label is allocated based on the VPN instance IPv4 address family, which ensures that
all the routes in a VPN instance use the same MPLS label.
Step 7 (Optional) Run:
routing-table limit number { alert-percent | simply-alert }
The maximum number of routes of the VPN instance IPv4 address family is configured.
Step 8 (Optional) Run:
prefix limit number { alert-percent [ route-unchanged ] | simply-alert }
The maximum number of prefixes of the VPN instance IPv4 address family is configured.
Step 9 (Optional) Run:
limit-log-interval interval
The frequency of displaying logs when the number of routes exceeds the threshold is configured.
Step 10 (Optional) Run:
import route-policy policy-name
The import routing policy of the VPN instance IPv4 address family is configured.
Step 11 (Optional) Run:
export route-policy policy-name
The export routing policy of the VPN instance IPv4 address family is configured.
----End
3.7.6 (Optional) Enabling Next-Hop-based Label Allocation on the
ASBR
To save label resources on an ASBR, you can enable next-hop-based label allocation on the
ASBR. Note that next-hop-based label allocation and one label per instance need to be used
together on the ASBR.
Context
In a VPN Option B scenario, after next-hop-based label allocation is enabled on the ASBR, the
ASBR allocates only one label for the IPv4 VPN routes with the same next hop and outgoing
label. Compared with allocating a label for each IPv4 VPN route, next-hop-based label allocation
saves label resources.
Perform the following steps on the ASBR.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
bgp as-number
The BGP view is displayed.
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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