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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-68
autonomous system to which Router C belongs; when creating the neighbor,
the reserved AS number of 23456 shall be used to replace 1.2 when
configuring remote-as.
Although Router B supports 4-octet AS number, it still uses the 2-octet AS
number. Therefore, the AS number of peer side can be used as remote-as
while neighbor interconnection is being created between Router A and
Router B.
Router B can recognize the 4-octet AS number used by the autonomous
system to which Router C belongs. The AS number of peer side can be used
as remote-as while creating the neighbor.
Configuration Steps
Router A
DES-7200# conf t
DES-7200(config)# router bgp 64496
DES-7200(config-router)# neighbor 172.18.1.2 remote-as 64497
DES-7200(config-router)# neighbor 172.18.2.3 remote-as 23456
Router B
DES-7200# conf t
DES-7200(config)# router bgp 64497
DES-7200(config-router)# neighbor 172.18.1.1 remote-as 64496
DES-7200(config-router)# neighbor 172.18.3.3 remote-as 1.2
# Use "bgp asnotation dot" command to change the display format of 4-octet AS
number
DES-7200(config-router)# bgp asnotation dot
DES-7200(config-router)# end
DES-7200# clear ip bgp *
Router C
DES-7200# conf t
DES-7200(config)# router bgp 1.2
DES-7200(config-router)# neighbor 172.18.2.1 remote-as 64496
DES-7200(config-router)# neighbor 172.18.3.2 remote-as 64497
Verification
Display the neighbor connection state on Router A:
DES-7200# show ip bgp summary
BGP router identifier 172.18.1.1, local AS number 64496
BGP table version is 1, main routing table version 1