Huawei quidway s7700 Configuration Manual page 117

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
ip vpn-instance vpn-instance-name
The VPN instance view is displayed.
Step 3 Run:
vpn-target vpn-target &<1-8> [ both | export-extcommunity | import-extcommunity ]
The VPN target extended community attribute for the VPN instance is created.
VPN target is the extended community attribute of the Border Gateway Protocol (BGP). It
controls the import and export of VPN routes. You can configure a maximum of 8 VPN targets
with a command.
Step 4 (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 prevent the PE from
importing too many routes from the CE.
Step 5 (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 from the CE.
Step 6 (Optional) Run:
limit-log-interval interval
The frequency of displaying logs when the number of routes exceeds the threshold is configured.
Step 7 (Optional) Run:
import route-policy policy-name
Issue 01 (2011-07-15)
NOTE
It is recommended to perform either Step 4 or Step 5.
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 maximum. 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.
For the remote cross routes learnt through the MP-IBGP and the BGP routes learnt from CEs, the system
automatically refreshes them.
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3 BGP MPLS IP VPN Configuration
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