Add communities on direct routes in Juniper

Sun Oct 15 20:45:33 UTC 2023

I believe you need to add the communities either on the import policy which pulls in the direct route or the export policy to the neighbor(s) you want to feed the communities to. 

Owen

> On Oct 15, 2023, at 05:51, Jason R. Rokeach via NANOG <nanog at nanog.org> wrote:
> 
> Hi Stanislav,
> I believe this is what you are looking for:
> 
> [edit]
> jcluser at Lothlorien-MX1# show | compare 
> [edit interfaces lo0 unit 0 family inet]
>        address 10.0.0.0/32 { ... }
> +       address 5.5.5.5/32;
> [edit protocols bgp]
> -   export IPV4-STATIC;
> +   export [ IPV4-STATIC TAG-DIRECT ];
> [edit policy-options]
> +   policy-statement TAG-DIRECT {
> +       from {
> +           protocol direct;
> +           route-filter 5.5.5.5/32 exact;
> +       }
> +       then {
> +           community set MYCOMMUNITY;
> +           accept;
> +       }
> +   }
> [edit policy-options]
> +   community MYCOMMUNITY members 5:5;
> 
> [edit]
> jcluser at Lothlorien-MX1# commit 
> commit complete
> 
> [edit]
> jcluser at Lothlorien-MX1# run show route advertising-protocol bgp 172.19.0.2 detail | find 5.5.5.5 
> * 5.5.5.5/32 (1 entry, 1 announced)
> BGP group RR-LOADBALANCER type External
>     Nexthop: Self
>     AS path: [65000] I 
>     Communities: 5:5
> 
> Regards,
> Jason R. Rokeach
> 
> 
> ------- Original Message -------
>> On Sunday, October 15th, 2023 at 8:29 AM, Saku Ytti - saku at ytti.fi <saku_at_ytti_fi_wamwii at simplelogin.co> wrote:
>> 
>> 
>> Unfortunately not yet, as far as I know. Long time ago I gave this to
>> my account team
>> 
>> Title: Direct routes must support tag and or community
>> Platform: Trio, priority MX80, MPC2
>> JunOS: 12.4Rx
>> Command: 'set interfaxe ge-4/2.0 family inet address 10.42.42.1/24
>> tag|community X'
>> JTAC: n/a
>> ER:
>> - Router must be able to add tags communities to direct routes directly, like
>> it does for static routes
>> 
>> Usage Case:
>> Trivial way to signal route information to BGP. Often tag/community is used
>> by service providers to singal 'this is PI/PA prefix, leak it to internet' or
>> 'this is backup route, reduce its MED'. However for some reason it is only
>> supported for static routes, while usage scenario and benefits are exactly the
>> same for direct routes.
>> 
>> On Sun, 15 Oct 2023 at 15:27, Stanislav Datskevych via NANOG
>> nanog at nanog.org wrote:
>> 
>>> Dear all,
>>> 
>>> Is there a way to add BGP communities on direct (interface) routes in Junipers? The task looks to be simple but the solution eludes me.
>>> In Cisco/Arista, for example, I could use "network 192.0.2.0/24 route-map <SOME_MAP_THAT_ADDS_COMMUNITIES>".
>>> 
>>> In Juniper it seems to be impossible. I even tried putting interface-routes into rib-group with an import policy.
>>> But it seems the import policy only works on importing routes into Secondary routing tables (e.g. inet.50), and not into the Primary one (inet.0).
>>> 
>>> I know it's possible to add communities on later stage while announcing networks to peers, in [protocols bgp group <name> export]. But I'd better slap the community on the routes right when they're imported into RIB, not when they announced to peers.
>>> 
>>> Thanks in advance.
>> 
>> 
>> 
>> --
>> ++ytti
> 