BGP add-path with Juniper

10 Sep 2015

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Hi, list.
I'm trying to use BGP add-path feature in BIRD connected my Juniper
router, but I have no luck with it.

Here is my BIRD (version 1.5.0) config:
template bgp probe {
    multihop;
    import where avoid_martians();
    export none;
    import keep filtered;
    add paths rx;
}

protocol bgp mh1 from probe {
    local as 65530;
    neighbor xx.xx.146.2 as 65530;  # Juniper's address
}

Here is Juniper's bgp group config:
show configuration protocols bgp group BGP-PROBE
type internal;
multihop;
import DropEverything;
family inet {
    unicast {
        add-path {
            send {
                prefix-policy accept-all;
                path-count 6;
            }
        }
    }
}
export accept-all;
peer-as 65530;
neighbor xx.xx.146.23;

In this configuration, BGP sessions establishes without any problem, but
Juniper believes that BIRD doesn't support AddPath feature:
# show bgp neighbor xx.xx.146.23 | match AddPath           
  Peer does not support Addpath

When I try to enable capability advertisement in BIRD config by setting
"capabilities on;" switch, Juniper refuses to establish BGP session with
log message:
Sep 10 16:39:46  mx480 rpd[1632]: bgp_parse_open_options: peer
xx.xx.146.23+60740 (proto): Bad capability length 1, when 0 left
Sep 10 16:39:46  mx480 rpd[1632]: bgp_get_open:2666: NOTIFICATION sent
to xx.xx.146.23+60740 (proto): code 2 (Open Message Error) subcode 7
(unsupported capability)

I'll be grateful for any advice.
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BGP add-path with Juniper

Stanislaw Datskevich