Cisco ASR 9000 Series Routing Configuration Manual page 137

Implementing BGP
After a neighbor group is configured, each neighbor can inherit the configuration through the use command.
If a neighbor is configured to use a neighbor group, the neighbor (by default) inherits the entire configuration
of the neighbor group, which includes the address family-independent and address family-dependent
configurations. The inherited configuration can be overridden if you directly configure commands for the
neighbor or configure session groups or address family groups through the use command.
You can configure an address family-independent configuration under the neighbor group. An address
family-dependent configuration requires you to configure the address family under the neighbor group to
enter address family submode.
From neighbor group configuration mode, you can configure address family-independent parameters for the
neighbor group. Use the address-family command when in the neighbor group configuration mode.
After specifying the neighbor group name using the neighbor group command, you can assign options to
the neighbor group.
Note All commands that can be configured under a specified neighbor group can be configured under a neighbor.
SUMMARY STEPS
1. configure
2. router bgp as-number
3. address-family { ipv4 | ipv6 } unicast
4. exit
5. neighbor-group name
6. remote-as as-number
7. address-family { ipv4 | ipv6 } unicast
8. route-policy route-policy-name { in | out }
9. exit
10. exit
11. neighbor ip-address
12. use neighbor-group group-name
13. remote-as as-number
14. commit
DETAILED STEPS
Command or Action
Step 1
configure
Step 2
router bgp as-number
Example:
RP/0/RSP0/CPU0:router(config)# router bgp 120
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
Configuring a BGP Neighbor Group and Neighbors
Purpose
Specifies the autonomous system number and enters the
BGP configuration mode, allowing you to configure the
BGP routing process.
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