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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 4 Configuring Multiprotocol Label Switching
IPv6 VPN over MPLS
BGP Features
The following features are supported on Cisco 10000 series routers by the IPv6 VPN over MPLS (6VPE)
feature:
• Site of Origin (SoO)
SoO is used to prevent routing loops in the case of a dual-homed CE. The 6VPE feature supports the
SoO Attribute for control of IPv6 VPN routes in the same way as it is currently supported for IPv4
VPNs.
For information on configuring this feature, see the How to Configure EIGRP MPLS VPN PE-CE
Site of Origin (SoO) Support section in the EIGRP MPLS VPN PE-CE Site of Origin (SoO) guide at:
http://www.cisco.com/en/US/docs/ios/12_4/ip_route/configuration/guide/h_mvesoo_ps6350_TSD
_Products_Configuration_Guide_Chapter.html#wp1048097
• ASN Override
If a global ASN is specified, BGP automatically replaces the ASN with a unique number to ensure
the site is uniquely identified. The 6VPE feature supports the ASN Override BGP feature via the use
of the as-override keyword in the same way as the feature is currently supported by IPv4 VPNs.
• Allow-AS-in
A BGP speaker normally ignores a received update that contains its own ASN in the AS_PATH
attribute. This check must be omitted in the case of hub-and-spoke topology. The 6VPE feature
supports the Allow-AS-in BGP feature via the use of the allowas-in keyword in the same way as the
feature is currently supported by IPv4 VPNs.
• BGP Prefix List Filtering
The 6VPE feature supports the ability to filter MP-BGP IPv6 advertisements based on configured
IPv6 prefixes.
For information on configuring this feature, see the Configuring BGP Filtering Using Prefix Lists
section in the Configuring BGP chapter of the Cisco IOS IP Configuration Guide, Release 12.2
guide at:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbgp.html#wp1001470
• BGP AS Path Filtering
The 6VPE feature supports the ability to filter MP-BGP IPv6 advertisement based on configured AS
paths.
For information on configuring this feature, see the Configuring BGP Path Filtering by Neighbor
section in the Configuring BGP chapter of the Cisco IOS IP Configuration Guide, Release 12.2
guide at:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbgp.html#wp1001644
• BGP Max Prefix
The 6VPE feature supports an upper limit on the number of BGP routes that have been learned from
a given CE. The 6VPE feature also supports the Max Prefix BGP feature via the use of the
maximum-prefix keyword in the same way as the feature is currently supported by IPv4 VPNs.
For information on configuring this feature, see the Configuring BGP section in the Configuring
BGP chapter of the Cisco IOS IP Configuration Guide, Release 12.2 guide at:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbgp.html
• BGP Route Refresh