point to point connection but no routes imported.

16 Feb 2024

      Hi all,

I have an issue witth the route import onbetween two machine. They are connected to each others  by a vlan and at each end ana /31 is setup. I can ping between  each end.

R1: VLAN330(1.1.1.1) ----> R2 : VLAN330(1.1.1.2)

R2( 1.1.1.2)  is connected to upstreams transit  and collect correctly the routes. But when I do the following config on this rouyer (R2):

R2 is showing some  exported routes but R1 received nothing:

```
    Route change stats:     received   rejected   filtered    ignored   accepted
      Import updates:              1          0          0          0          1
      Import withdraws:            0          0        ---          0          0
      Export updates:         934590         27          0        ---     934563
      Export withdraws:           18        ---        ---        ---         18
```

What could be the issue ? 

I have the following configuratiosn: 

R1:
```
define AS65001_IPV4 = [    1.1.1.184/29{29,32}
];

filter ebgp_home_as65001_import {
        if (net.type = NET_IP4 && ! (net ~ AS65001_IPV4)) then reject;
        accept;
}

filter ebgp_home_as65001_export {

protocol bgp home_65001_ipv4 {
  local 1.1.1.2 as 209823;
  neighbor 1.1.1.1 as 65001;
  default bgp_med 0;
  default bgp_local_pref 400;
  ipv4 {
    import keep filtered;
    import filter ebgp_home_as65001_import;
    export all;
    next hop self on;
  };
};
```

R2:

```
router id 1.1.1.1;

log syslog all;

log "/var/log/bird.log" all;
debug protocols all;

watchdog warning 5 s;
watchdog timeout 30 s;

protocol device {
  scan time 30;
}

protocol direct {
  ipv4;
  ipv6;
  check link yes;
}

protocol kernel kernel4 {
  ipv4 { import all; export where source != RTS_DEVICE; };
  learn off;
  scan time 300;
}

protocol kernel kernel6 {
  ipv6 { import all; export where source != RTS_DEVICE; };
  learn off;
  scan time 300;
}

protocol static static4 {
  ipv4 { export all; };
  # Reject default route
 route 0.0.0.0/0 unreachable;

  # main route
  route 1.1.1.184/29 blackhole;
}

filter bgp_export {
  if (net.type = NET_IP4 && ! (net ~ [ 1.1.1.184/29 ])) then reject;

  accept;
}

template bgp T_GW4 {
  local 1.1.1.1 as 65001;
  default bgp_med 0;
  default bgp_local_pref 400;
  multihop;
  ipv4 { import keep filtered; import all; export filter bgp_export; next hop self on; };
}

protocol bgp ccre1_ipv4_1 from T_GW4 { neighbor 1.1.1.2 as <PUBLIC AS >; };
```

Benoît Chesneau, Enki Multimedia
—
t. +33608655490 

Sent with Proton Mail secure email.

point to point connection but no routes imported.

Benoit Chesneau