An IPv6 VPN Instance takes effect only after the RD is configured. Before configuring the RD,
you may configure only the description for the IPv6 VPN Instance .
Step 5
(Optional) Run:
apply-label per-instance
The label is allocated based on IPv6 VPN instance . That is, all the routes in An IPv6 VPN
Instance use the same label.
By default, the MPLS labels are allocated on one label per route.
The S7700 provides the feature of the MPLS label allocation based on the IPv6 VPN instance ,
that is, all the routes of the IPv6 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 IPv6 VPN instance is configured.
You can define the maximum number of routes that can be supported by An IPv6 VPN
Instance to avoid a PE importing too many routes of the IPv6 VPN instance .
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 to
increase the maximum number of routes supported in an IPv6 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.
Step 7
(Optional) Run:
prefix limit
number
{
alert-percent
[
route-unchanged
] |
simply-alert
}
The maximum number of prefixes of the IPv6 VPN instance is configured.
You can define the maximum number of prefixes for the IPv6 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
4.5.3 Configuring Route Related Attributes of an IPv6 VPN Instance
In the networking of Hub and Spoke, VPN targets are configured on the Hub-PE and Spoke-
PEs to control the advertisement of IPv6 VPN routes. The import VPN target configured on the
Hub-PE must contain the export VPN targets configured on all Spoke-PEs. The export VPN
target configured on the Hub-PE must contain the import VPN targets configured on all Spoke-
PEs.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
4 BGP MPLS IPv6 VPN Configuration
Issue 01 (2011-07-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
342