Origin As of prefix IS local-as (private AS number)

[admin@atrinnet.net]

Hi Dears i have this topoly but when announce prefix 1.1.1.0/24 allow by prefix-list on bgp connection private-As

(65444-by 65445) in As-path see valid as-number How fix this ?

The Origin As is private As-number

[paul driver]

Hello
Can you elaborate please--- i think I understand what you want to do but the topology isnt unclear.

RTR1 =AS65445
RTR2= AS65444  - 1.1.1.0/24

[admin@atrinnet.net]

My primary As is valid i create bgp session router B and A (by local-AS)

and filter by prefix-list announce 1.1.1.0/24 (announce by session local-AS)

now show ip bgp 1.1.1.0/24

show origin as is valid AS (must be private AS)

Prefix 1.1.1.0/24 Announce by router B

[paul driver · Accepted solution]

Hello
So based on your topology and that url link you wish  - the base premise is for a single rtr 65445 (65444) to allow two different ebgp rtrs to peer towards it using different AS numbers

Also for any advertised prefixes to/from either ebgp peer, will be seen traversing the local/hidden ASN of that single rtr

Example
router bgp 65445
network 1.1.1.0 mask 255.255.255.0
neighbor 10.1.12.2 remote-as 65100
neighbor 10.1.13.3 remote-as 65101
neighbor 10.1.13.3 local-as 65444 no-prepend replace-as

local-as = allows ebgp rtr 65101 to peer with 65445 using AS65444
no-prepend = allows single rtr 65445 to remove or not prepend the local-asn 65444 towards rtr 65100 for any routes/prefixes advertised from 65101
replace-as = will replace and not show asn 65445 for any routse advertised to rtr 65101  so ONLY as 65444 is shown in all advertised prefixes 

[admin@atrinnet.net]

I see this link but i dont find any configuration How do this by bgp 

https://bgplabs.net/session/3-localas/#start-the-lab