R3102-R3103-HP 6600/HSR6600 Routers MPLS Command Reference Guide

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The external route tag is used to avoid routing loops. If the external route tag carried in a Type 5 or 7 LSA
received by a PE is the same as the locally configured external route tag, the PE neglects the LSA in route
calculation to avoid routing loops.
HP recommends that you configure configuring the same external route tag for PEs in the same area.
An external route tag is not transferred in any BGP extended community attribute. It is only locally
significant and takes effect only on the PEs that receive BGP routes and generate OSPF Type 5 or 7 LSAs.
You can configure the same external route tag for different OSPF processes.
Examples
# In OSPF process 100, set the external route tag for imported VPN routes to 100.
<Sysname> system-view
[Sysname] ospf 100
[Sysname-ospf-100] route-tag 100
Related commands
• import-route
• default (Layer 3—IP Routing Command Reference)
routing-table limit (VPN instance view/IPv4 VPN view)
Use routing-table limit to limit the maximum number of routes in a VPN instance, preventing too many
routes from being accepted by a PE.
Use undo routing-table limit to restore the default.
Syntax
routing-table limit number { warn-threshold | simply-alert }
undo routing-table limit
Default
A VPN instance supports up to 100000 routes.
Views
VPN instance view, IPv4 VPN view
Default command level
2: System level
Parameters
number: Specifies the maximum number of routes supported. The value range varies by device.
warn-threshold: Specifies a threshold for warning, in the range of 1 to 100, in percentages. When the
percentage of the number of existing routes to the maximum number of routes supported exceeds the
specified threshold, the system gives an alarm message but still allows new routes. If the number of routes
in the VPN instance reaches the maximum supported, no more routes are added.
simply-alert: Specifies that when the number of routes exceeds the maximum number of routes supported,
the system still accepts routes but generates a system log (Syslog) message.
Usage guidelines
A limit configured in VPN instance view applies to both the IPv4 VPN and the IPv6 VPN.