Per Vrf And Per Ce Label For Ipv6 Provider Edge; Ipv4 Bgp-Policy Accounting On Cisco Asr 9000'S A9K-Sip-700; Ipv6 Unicast Routing On Cisco Asr 9000'S A9K-Sip-700 - Cisco ASR 9000 Series Routing Configuration Manual

Implementing BGP
of the core links is mapped to OSPF cost, hence it is imperative that BGP carries this cost correctly between
each of the PEs. This functionality is achieved by using the AiGP.

Per VRF and Per CE Label for IPv6 Provider Edge

The per VRF and per CE label for IPv6 feature makes it possible to save label space by allocating labels per
default VRF or per CE nexthop.
All IPv6 Provider Edge (6PE) labels are allocated per prefix by default. Each prefix that belongs to a VRF
instance is advertised with a single label, causing an additional lookup to be performed in the VRF forwarding
table to determine the customer edge (CE) next hop for the packet.
However, use the label mode command with the per-ce keyword or the per-vrf keyword to avoid the additional
lookup on the PE router and conserve label space.
Use per-ce keyword to specify that the same label be used for all the routes advertised from a unique customer
edge (CE) peer router. Use the per-vrf keyword to specify that the same label be used for all the routes
advertised from a unique VRF.

IPv4 BGP-Policy Accounting on Cisco ASR 9000's A9K-SIP-700

Border Gateway Protocol (BGP) policy accounting measures and classifies IP traffic that is sent to, or received
from, different peers. Policy accounting is enabled on an individual input or output interface basis. Counters
based on parameters such as community list, autonomous system number, or autonomous system path are
assigned to identify the IP traffic.
Using BGP policy accounting, you can account for traffic according to the route it traverses. Service providers
can identify and account for all traffic by customer and bill accordingly.
For more information on BGP policy accounting and how to configure BGP policy accounting, refer the
Implementing Cisco Express Forwarding module in Cisco ASR 9000 Series Aggregation Services Router IP
Addresses and Services Configuration Guide.

IPv6 Unicast Routing on Cisco ASR 9000's A9K-SIP-700

Cisco ASR 9000's A9K-SIP-700 provides complete Internet Protocol Version 6 (IPv6) unicast capability.
An IPv6 unicast address is an identifier for a single interface, on a single node. A packet that is sent to a unicast
address is delivered to the interface identified by that address. Cisco IOS XR software supports the following
IPv6 unicast address types:
• Global aggregatable address
• Site-local address
• Link-local address
• IPv4-compatible IPv6 address
For more information on IPv6 unicase addressing, refer the Implementing Network Stack IPv4 and IPv6
module in Cisco ASR 9000 Series Aggregation Services Router IP Addresses and Services Configuration
Guide.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
Per VRF and Per CE Label for IPv6 Provider Edge
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