RP/0/RSP0/CPU0:router(config-bgp-nbr)# neighbor 2.2.2.2
RP/0/RSP0/CPU0:router(config-bgp-nbr)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-bgp-nbr-af)# multipath
RP/0/RSP0/CPU0:router(config-bgp-nbr-af)# commit
RP/0/RSP0/CPU0:router(config-bgp-nbr)# neighbor 3.3.3.3
RP/0/RSP0/CPU0:router(config-bgp-nbr)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-bgp-nbr-af)# commit
You have successfully configured the BGP selective multipath feature.
Accumulated Interior Gateway Protocol Attribute
The Accumulated Interior Gateway Protocol (AiGP)Attribute is an optional non-transitive BGP Path Attribute.
The attribute type code for the AiGP Attribute is to be assigned by IANA. The value field of the AiGP Attribute
is defined as a set of Type/Length/Value elements (TLVs). The AiGP TLV contains the Accumulated IGP
Metric.
The AiGP feature is required in the 3107 network to simulate the current OSPF behavior of computing the
distance associated with a path. OSPF/LDP carries the prefix/label information only in the local area. Then,
BGP carries the prefix/lable to all the remote areas by redistributing the routes into BGP at area boundaries.
The routes/labels are then advertised using LSPs. The next hop for the route is changed at each ABR to local
router which removes the need to leak OSPF routes across area boundaries. The bandwidth available on each
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.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
56 OL-30423-03
Implementing BGP
Accumulated Interior Gateway Protocol Attribute
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