Add communities on direct routes in Juniper

Sun Oct 15 12:50:24 UTC 2023

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