Step 3 (Optional) Run:
description description-information
The description about the VPN instance is configured.
The description can be used to record the relationship between a VPN instance and a certain
VPN.
Step 4 Run:
route-distinguisher route-distinguisher
The RD of the VPN instance is configured.
A VPN instance takes effect only after the RD is configured. Before configuring the RD, you
can configure only the description about the VPN instance.
Step 5 (Optional) Run:
apply-label per-instance
The label is allocated based on VPN instance. That is, all the routes in a VPN instance use the
same label.
The MPLS labels are generally allocated on a one label per route basis.
The S7700 provides the feature of the MPLS label allocation based on the VPN instance, that
is, all the routes of a VPN instance share the same label.
Step 6 (Optional) Run:
routing-table limit number { alert-percent | simply-alert }
The maximum number of routes of the VPN instance is configured.
You can define the maximum number of routes for a VPN instance to avoid importing too many
routes.
NOTE
If the routing-table limit command is run, the system gives a prompt when the number of routes injected
into the routing table of the VPN instance exceeds the upper limit. If the routing-table limit command is
run to increase the maximum number of routes supported in a VPN instance or the undo routing-table
limit command is run to remove the limit on the routing table, for excess routes, the following operations
are required:
l For the excessive static routes, you need to reconfigure them manually.
l For the excessive routes learnt from CEs through the IGP multi-instance routing protocol, you need to
re-initiate the multi-instance process of the routing protocol on the PE.
l For the remote cross routes learnt through the MP-IBGP and the BGP routes learnt from CEs, the
system automatically refreshes them.
Step 7 (Optional) Run:
prefix limit number { alert-percent [ route-unchanged ] | simply-alert }
The maximum number of prefixes of the VPN instance is configured.
You can define the maximum number of prefixes for a VPN instance to avoid importing too
many prefixes.
Step 8 (Optional) Run:
limit-log-interval interval
The frequency of displaying logs when the number of routes exceeds the threshold is configured.
----End
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
119
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