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BGP Multipath Load Sharing for eBGP and iBGP in an MPLS VPN
The IGP Convergence Acceleration feature leverages the load balance infrastructure of equal paths for
unequal paths. An indirection object is inserted for table output chain building. When the interface goes
down, the routing protocols purge their routes and the inplace modifier prevents marking of labels with
incomplete adjacency. Therefore, the indirection object can use the new adjacency labels. This update in
the IGP Convergence Acceleration feature makes the convergence independent of the number of BGP
prefixes, thereby allowing a faster failover.
Configuring IGP Convergence Acceleration
To configure the IGP Convergence Acceleration feature for unequal cost paths, enter the following
commands beginning in global configuration mode:
Command
Step 1
Router(config)# cef table output-chain
build favor convergence-speed
Step 2
Router(config)# cef table output-chain
build inplace-modify load-sharing
Step 3
Router(config)# ip routing protocol purge
interface
Configuring BGP Multipath Load Sharing for eBGP and iBGP in an MPLS
VPN
To configure the BGP Multipath Load Sharing for Both eBGP and iBGP in an MPLS VPN feature,
perform the following configuration tasks:
•
•
Cisco 10000 Series Router Software Configuration Guide
4-4
Configuring Multipath Load Sharing for eBGP and iBGP, page 4-5
Verifying Multipath Load Sharing for eBGP and iBGP, page 4-5
Chapter 4
Purpose
Enables the output chain building to favor convergence.
Enables the output chain building for inplace-modify.
Allows the routing protocol to purge routes without letting RIB
delete BGP prefixes.
Configuring Multiprotocol Label Switching
OL-2226-23
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Troubleshooting
