Cisco ASR 9000 Series Configuration Guide

Storing updates from a neighbor works only if either the neighbor is route refresh capable or the
soft-reconfiguration inbound command is configured. Even if the neighbor is route refresh capable and
the soft-reconfiguration inbound command is configured, the original routes are not stored unless the
always option is used with the command. The original routes can be easily retrieved with a route refresh
request. Route refresh sends a request to the peer to resend its routing information. The soft-reconfiguration
inbound command stores all paths received from the peer in an unmodified form and refers to these stored
paths during the clear. Soft reconfiguration is memory intensive.
Note
SUMMARY STEPS
1.
configure
2.
router bgp as-number
3.
neighbor ip-address
4.
address-family { ipv4 | ipv6 } unicast
5.
soft-reconfiguration inbound [ always]
6.
commit
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
Places the router in neighbor configuration mode for BGP routing
and configures the neighbor IP address as a BGP peer.
neighbor ip-address
Example:
RP/0/RSP0/CPU0:router(config-bgp)#
neighbor 172.168.40.24
Step 3
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-nbr)#
address-family ipv4 unicast
Step 4
To see a list of all the possible keywords and arguments for this
command, use the CLI help (?).
Configures the software to store updates received from a specified
neighbor. Soft reconfiguration inbound causes the software to store
soft-reconfiguration inbound [ always]
Example:
RP/0/RSP0/CPU0:router(config-bgp-nbr-af)#
soft-reconfiguration inbound always
Step 5
the original unmodified route in addition to a route that is modified
or filtered. This allows a “soft clear” to be performed after the inbound
policy is changed.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
OL-30423-03 111
Implementing BGP
Configuring Software to Store Updates from a Neighbor

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English