Optional) Enabling Next-Hop-Based Label Allocation On The Asbr - Huawei quidway s7700 Configuration Manual

Smart routing switch

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Quidway S7700 Smart Routing Switch

Configuration Guide - VPN

route-distinguisher route-distinguisher

The RD is configured for the IPv6 VPN instance.

vpn-target vpn-target &<1-8> import-extcommunity

The VPN target extended community for the IPv6 VPN instance is created.

For the same VPN in the inter-AS VPN-Option B mode, the VPN targets of the ASBR and the

PE in an AS should match with each other.

The VPN targets of the PE in different Ass must match with each other likewise.

Step 5 (Optional) Run

routing-table limit number { alert-percent | simply-alert }

The maximum number of routes is configured for the IPv6 VPN instance.

Step 6 (Optional) Run:

prefix limit number { alert-percent [ route-unchanged ] | simply-alert }

The maximum number of prefixes of the IPv6 VPN instance is configured.

Step 7 (Optional) Run:

limit-log-interval interval

The frequency of displaying logs when the number of routes exceeds the threshold is configured.

Step 8 (Optional) Run:

import route-policy policy-name

An import routing policy is created for the IPv6 VPN instance.

Step 9 (Optional) Run:

export route-policy policy-name

An export routing policy is created for the IPv6 VPN instance.

4.8.6 (Optional) Enabling Next-Hop-based Label Allocation on the

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 enabled

together on the ASBR.

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 IPv6 VPN routes with the same next hop and outgoing

label. Compared with allocating a label for each IPv6 VPN route, next-hop-based label allocation

greatly saves the label resources.

Do as follows on the ASBR:

Issue 01 (2011-07-15)

Huawei Proprietary and Confidential

4 BGP MPLS IPv6 VPN Configuration