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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR
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Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR
router /jointfilesconvert/475093/bgp
autonomous system number registry. Reserved 2-byte autonomous system numbers are in the contiguous
block, 64496 to 64511 and reserved 4-byte autonomous system numbers are from 65536 to 65551
inclusive.
Private 2-byte autonomous system numbers are still valid in the range from 64512 to 65534 with 65535
being reserved for special use. Private autonomous system numbers can be used for internal routing
domains but must be translated for traffic that is routed out to the Internet. BGP should not be configured
to advertise private autonomous system numbers to external networks. Cisco IOS software does not
remove private autonomous system numbers from routing updates by default. We recommend that ISPs
filter private autonomous system numbers.
Note Autonomous system number assignment for public and private networks is governed by the IANA. For
information about autonomous-system numbers, including reserved number assignment, or to apply to
register an autonomous system number, see the following URL: http://www.iana.org/.
Examples The following example configures a BGP process for autonomous system 45000 and configures two
external BGP neighbors in different autonomous systems using 2-byte autonomous system numbers:
router /jointfilesconvert/475093/bgp 45000
neighbor 192.168.1.2 remote-as 40000
neighbor 192.168.3.2 remote-as 50000
neighbor 192.168.3.2 description finance
!
address-family ipv4
neighbor 192.168.1.2 activate
neighbor 192.168.3.2 activate
no auto-summary
no synchronization
network 172.17.1.0 mask 255.255.255.0
exit-address-family
The following example configures a BGP process for autonomous system 65538 and configures two
external BGP neighbors in different autonomous systems using 4-byte autonomous system numbers in
asplain notation. This example is supported in Cisco IOS Release 12.0(32)SY8, 12.2(33)SXI1,
12.0(33)S3, Cisco IOS XE Release 2.4, and later releases.
router /jointfilesconvert/475093/bgp 65538
neighbor 192.168.1.2 remote-as 65536
neighbor 192.168.3.2 remote-as 65550
neighbor 192.168.3.2 description finance
!
address-family ipv4
neighbor 192.168.1.2 activate
neighbor 192.168.3.2 activate
no auto-summary
no synchronization
network 172.17.1.0 mask 255.255.255.0
exit-address-family
The following example configures a BGP process for autonomous system 1.2 and configures two
external BGP neighbors in different autonomous systems using 4-byte autonomous system numbers in
asdot notation.
router /jointfilesconvert/475093/bgp 1.2
neighbor 192.168.1.2 remote-as 1.0
neighbor 192.168.3.2 remote-as 1.14
neighbor 192.168.3.2 description finance
!
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