BGP DMZ Link Bandwidth for Unequal Cost Recursive Load Balancing
Border Gateway Protocol demilitarized zone (BGP DMZ) Link Bandwidth for Unequal Cost Recursive Load
Balancing provides support for unequal cost load balancing for recursive prefixes on local node using BGP
DMZ Link Bandwidth. The unequal load balance is achieved by using the dmz-link-bandwidth command
in BGP Neighbor configuration mode and the bandwidth command in Interface configuration mode.
BFD Multihop Support for BGP
Bi-directional Forwarding Detection Multihop (BFD-MH) support is enabled for BGP. BFD Multihop
establishes a BFD session between two addresses that may span multiple network hops. Cisco IOS XR Software
BFD Multihop is based on RFC 5883. For more information on BFD Multihop, refer Cisco ASR 9000 Series
Aggregation Services Router Interface and Hardware Component Configuration Guide and Cisco ASR 9000
Series Aggregation Services Router Interface and Hardware Component Command Reference.
BGP Multi-Instance and Multi-AS
Multiple BGP instances are supported on the router corresponding to a Autonomous System (AS). Each BGP
instance is a separate process running on the same or on a different RP/DRP node. The BGP instances do not
share any prefix table between them. No need for a common adj-rib-in (bRIB) as is the case with distributed
BGP. The BGP instances do not communicate with each other and do not set up peering with each other. Each
individual instance can set up peering with another router independently.
Multi-AS BGP enables configuring each instance of a multi-instance BGP with a different AS number.
Multi-Instance and Multi-AS BGP provides these capabilities:
•
Mechanism to consolidate the services provided by multiple routers using a common routing infrastructure
into a single IOS-XR router.
•
Mechanism to achieve AF isolation by configuring the different AFs in different BGP instances.
•
Means to achieve higher session scale by distributing the overall peering sessions between multiple
instances.
•
Mechanism to achieve higher prefix scale (especially on a RR) by having different instances carrying
different BGP tables.
•
Improved BGP convergence under certain scenarios.
•
All BGP functionalities including NSR are supported for all the instances.
•
The load and commit router-level operations can be performed on previously verified or applied
configurations.
Restrictions
•
The router supports maximum of 4 BGP instances.
•
Each BGP instance needs a unique router-id.
•
Only one Address Family can be configured under each BGP instance (VPNv4, VPNv6 and RT-Constrain
can be configured under multiple BGP instances).
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
OL-30423-03 63
Implementing BGP
BGP DMZ Link Bandwidth for Unequal Cost Recursive Load Balancing
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