Huawei Quidway NetEngine80E Configuration Manual page 797

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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Issue 02 (2014-09-30)
The peer fake-as command can be used to hide the actual AS number of a BGP device.
EBGP peers in other ASs will use the fake AS number of this BGP device to set up
EBGP peer relationships with this device.
NOTE
This command can be used only on EBGP peers.
Enable AS number replacement.
Before advertising a route to a specified CE, a PE on which AS number replacement is
configured replaces the AS number of the CE in the AS_Path attribute of the route with the
local AS number.
NOTICE
Exercise caution when running the peer substitute-as command, because improper use of
this command may cause routing loops.
1. Run:
system-view
The system view is displayed.
2. Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
3. Run:
ipv4-family vpn-instance vpn-instance-name
The BGP-VPN instance IPv4 address family view is displayed.
4. Run:
peer { ipv4-address | group-name } substitute-as
AS number replacement is enabled.
Configure the AS_Path attribute to carry only public AS numbers.
A route advertised by a BGP device to its peer usually carries AS numbers. The AS numbers
may be public or private. Public AS numbers can be used on the Internet. They are assigned
and managed by the Internet Assigned Number Authority (IANA). Private AS numbers
cannot be advertised to the Internet, and they are used only within ASs. If private AS
numbers are advertised to the Internet, a routing loop may occur. To address this problem,
configure the device to delete private AS numbers from the AS_Path attribute.
1. Run:
system-view
The system view is displayed.
2. Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
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8 BGP Configuration
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