BGP advertise-map in XOS

[Elie_Raad]

I have a Multi-homed Routers connected to 2 ISPs. I need to Create like an Advertise-map on the Standby Router connected to the Standby ISP to only advertise my Public address if the primary link goes down .

Is there a way of doing it in XOS ?
Thank You,
Elie

[Nick_Yakimenko]

As i wrote before https://community.extremenetworks.com/extreme/topics/bgp-advertise-map-in-xos?topic-reply-list%5Bset...
if secondary ISP receives routes with localpref 50 and from other uplinks with 100, then routes will become unavailable through other uplinks and become active through direct connection

[Jarek]

Hi Elie,

first of all you need to know what BGP communities are accepted by your ISP's.
You should ask them, because sometimes they do not publish all BGP communities .

You can use for example well known (if they are accepted):
- no-export - which means do not export to any eBGP neighbor
- no-advertise - which means, do not export to any BGP neighbor at all.--

Jarek

[Balaji]

Elie,

My understanding is that you would like to advertise only the public network to the ISP, with that in mind the below configuration should work. (please correct me if the requirement is something different)

Below is the policy to filter the routes to be advertised and the command to apply the policy for a neighbor.

edit policy Route_Filter

entry permit-route {
if match any {
nlri 10.249.2.0/24;
} then {
permit;
} }

configure bgp neighbor 10.250.1.12 route-policy out Route_Filter

[Jarek]

Ok, now it is clear 🙂

--
Jarek

[Jarek]

Ok, now it is clear 🙂

--
Jarek