Cisco ASR 9000 Series Routing Configuration Guide

DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Specifies the autonomous system number and enters the BGP
configuration mode, allowing you to configure the BGP routing process.
router bgp as-number
Example:
RP/0/RSP0/CPU0:router(config)# router
bgp 120
Step 2
Specifies either an IPv4 or IPv6 address family unicast and enters address
family configuration submode.
address-family { ipv4 | ipv6 } unicast
Example:
RP/0/RSP0/CPU0:router(config-bgp)#
address-family ipv4 unicast
Step 3
To see a list of all the possible keywords and arguments for this
command, use the CLI help (?).
Configures the maximum number of parallel routes that BGP installs in
the routing table.
maximum-paths { ebgp | ibgp | eibgp }
maximum [ unequal-cost ]
Step 4
Example:
RP/0/RSP0/CPU0:router(config-bgp-af)#
maximum-paths ebgp 3
Note
•
Valid values for maximum-paths are 8 for ASR 9000
Ethernet Line Card and 32 for ASR 9000 Enhanced
Ethernet Line Card.
•
The ASR 9000 Ethernet Line Card limits the number of
routes to be installed to 8 in the forwarding hardware even
though the maximum-path value configured is more than
8.
•
ebgp maximum : Consider only eBGP paths for multipath.
•
ibgp maximum [ unequal-cost ]: Consider load balancing between
iBGP learned paths.
•
eibgp maximum : Consider both eBGP and iBGP learned paths
for load balancing. eiBGP load balancing always does unequal-cost
load balancing.
When eiBGP is applied, eBGP or iBGP load balancing cannot be
configured; however, eBGP and iBGP load balancing can coexist.
Exits the current configuration mode.exit
Example:
RP/0/RSP0/CPU0:router(config-bgp-af)#
exit
Step 5
Configures a CE neighbor. The ip-address argument must be a private
address.
neighbor ip-address
Example:
RP/0/RSP0/CPU0:router(config-bgp)#
neighbor 10.0.0.0
Step 6
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
175
Implementing BGP
Enabling BGP Unequal Cost Recursive Load Balancing

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English