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DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide
115
7-66 router bgp
This command is used to enable (configure) the BGP routing process. Use the no form of this command to remove a
BGP routing process.
router bgp AS-NUMBER
no router bgp AS-NUMBER
Parameters
Usage Guideline
This command is to set the route-preference for BGP route. BGP route contains two
types one is IBGP and the other is EBGP. When two or more route protocols have
learned one same route, the route-preference will be used to decide which one
should be added into IP route table. Of course, for one route the smaller the route-
preference, the better the route is.
Users can verify the settings by entering the show ip route-preference command in
Privileged mode.
Example
This example shows how to configure the iBGP route-preference for autonomous
system 200.
DXS-3600-32S#configure terminal
DXS-3600-32S(config)#router bgp 200
DXS-3600-32S(config-router)#route-preference ibgp 15
DXS-3600-32S(config-router)#
AS-NUMBER Specifies the number of an autonomous system that identifies the router to other
BGP routers. The range for 2-byte numbers is 1 to 65535. The range for 4-byte
numbers is 1 to 4294967295.
Default
No BGP routing process is enabled by default.
Command Mode
Global Configuration Mode.
Command Default Level
Level: 8. (EI Mode Only Command)
Usage Guideline
Each public autonomous system that directly connects to the Internet is assigned a
unique number that identifies both the BGP routing process and the autonomous
system (a number from 1 to 64511). Private autonomous system numbers are in the
range from 64512 to 65534 (65535 is reserved for special use).
The AS Number size is defined as 2 bytes in RFC1771 and RFC4271.
But the AS Number can be expanded to 4 bytes to support much AS
number.[RFC4893] To support 4-byte AS number, the AS number range is supported
from 1 to 4294967295.
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.
Use this command to enter router configuration mode for the specified routing
process.
Example
This example shows how to configure a BGP process for autonomous system 200.
DXS-3600-32S#configure terminal
DXS-3600-32S(config)#router bgp 200
DXS-3600-32S(config-router)#
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