PurposeCommand or Action
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 the IPv4 or IPv6 address family 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 (?).
Creates an aggregate address. The path advertised for this route is an
autonomous system set consisting of all elements contained in all paths
that are being summarized.
aggregate-address address/mask-length [
as-set ] [ as-confed-set ] [ summary-only ] [
route-policy route-policy-name ]
Step 4
Example:
RP/0/RSP0/CPU0:router(config-bgp-af)#
aggregate-address 10.0.0.0/8 as-set
•
The as-set keyword generates autonomous system set path
information and community information from contributing paths.
•
The as-confed-set keyword generates autonomous system
confederation set path information from contributing paths.
•
The summary-only keyword filters all more specific routes from
updates.
•
The route-policy route-policy-name keyword and argument
specify the route policy used to set the attributes of the aggregate
route.
commit
Step 5
Redistributing iBGP Routes into IGP
Perform this task to redistribute iBGP routes into an Interior Gateway Protocol (IGP), such as Intermediate
System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF).
Use of the bgp redistribute-internal command requires the clear route * command to be issued to
reinstall all BGP routes into the IP routing table.
Note
Redistributing iBGP routes into IGPs may cause routing loops to form within an autonomous system. Use
this command with caution.
Caution
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
OL-30423-03 87
Implementing BGP
Redistributing iBGP Routes into IGP
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