235
Step Command
Remarks
2.
Enter BGP IPv6 unicast
address family view,
BGP-VPN IPv6 unicast
address family view, or
BGP IPv6 multicast
address family view.
•
Enter BGP IPv6 unicast address family
view:
a.
bgp
as-number
b.
address-family ipv6
[
unicast
]
•
Enter BGP-VPN IPv6 unicast address
family view:
a.
bgp
as-number
b.
ip vpn-instance
vpn-instance-name
c.
address-family ipv6
[
unicast
]
•
Enter BGP IPv6 multicast address family
view:
a.
bgp
as-number
b.
address-family ipv6 multicast
N/A
3.
Disable BGP from
considering AS_PATH
during best route
selection.
bestroute as-path-neglect
By default, BGP considers
AS_PATH during best route
selection.
Advertising a fake AS number to a peer or peer group
After you move a BGP router from an AS to another AS (from AS 2 to AS 3 for example), you have to
modify the AS number of the router on all its EBGP peers. To avoid such modifications, you can configure
the router to advertise a fake AS number 2 to its EBGP peers so that the EBGP peers still think that Router
A is in AS 2.
To advertise a fake AS number to a peer or peer group (IPv4 unicast/multicast address family):
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP view or BGP-VPN
instance view.
•
Enter BGP view:
bgp
as-number
•
Enter BGP-VPN instance view:
a.
bgp
as-number
b.
ip vpn-instance
vpn-instance-name
N/A
3.
Advertise a fake AS number to
a peer or peer group.
peer
{
group-name
|
ip-address
}
fake-as
as-number
By default, no fake AS number is
advertised to a peer or peer group.
This command applies to only
EBGP peers or EBGP peer groups.
To advertise a fake AS number to a peer or peer group (IPv6 unicast/multicast address family):
Step Command
Remarks
1.
Enter system view.
system-view
N/A
