BGP import route

11 Apr 2018


      Hello,
I'm not able to import route from BGP (CentOS 7). In log file I read "Got
UPDATE" but  "import updates" is always 0. With TCPDUMP I see that BGP
receive the routes

Rr

------------------------------------------------------------
# more bird.conf
log syslog all;
log stderr all;
log "/var/log/bird.logg" all;
debug protocols all;

protocol kernel {
        persist;                # Don't remove routes on bird shutdown
        scan time 20;           # Scan kernel routing table every 20 seconds
}

protocol device {
        scan time 10;           # Scan interfaces every 10 seconds
}

router id 192.168.200.6;

protocol bgp bgp1 {
       local as 64521;
       neighbor 192.168.200.1 as 64520;
       import filter all;
}
------------------------------------------------------------


------------------------------------------------------------

# tail -f /var/log/bird.logg
2018-04-11 17:46:53 <TRACE> kernel1 < interface lo goes up
2018-04-11 17:46:53 <TRACE> kernel1 < interface eth0 goes up
2018-04-11 17:46:53 <TRACE> kernel1 < interface eth1 goes up
2018-04-11 17:46:53 <TRACE> kernel1: State changed to up
2018-04-11 17:46:53 <TRACE> bgp1: Started
2018-04-11 17:46:53 <TRACE> bgp1: Connect delayed by 5 seconds
2018-04-11 17:46:53 <TRACE> kernel1: Scanning routing table
2018-04-11 17:46:53 <TRACE> kernel1: 0.0.0.0/0: [alien] ignored
2018-04-11 17:46:53 <TRACE> kernel1: 192.168.44.0/24: [alien] ignored
2018-04-11 17:46:53 <TRACE> kernel1: Pruning table master
2018-04-11 17:46:57 <TRACE> bgp1: Connecting to 192.168.200.1 from local
address 192.168.200.6
2018-04-11 17:46:57 <TRACE> bgp1: Connected
2018-04-11 17:46:57 <TRACE> bgp1: Sending
OPEN(ver=4,as=64521,hold=240,id=c0a8c806)
2018-04-11 17:46:57 <TRACE> bgp1: Connection closed
2018-04-11 17:46:57 <TRACE> bgp1: Connect delayed by 5 seconds
2018-04-11 17:47:03 <TRACE> device1: Scanning interfaces
2018-04-11 17:47:03 <TRACE> bgp1: Connecting to 192.168.200.1 from local
address 192.168.200.6
2018-04-11 17:47:03 <TRACE> bgp1: Connected
2018-04-11 17:47:03 <TRACE> bgp1: Sending
OPEN(ver=4,as=64521,hold=240,id=c0a8c806)
2018-04-11 17:47:03 <TRACE> bgp1: Got OPEN(as=64520,hold=90,id=a3a2e686)
2018-04-11 17:47:03 <TRACE> bgp1: Sending KEEPALIVE
2018-04-11 17:47:03 <TRACE> bgp1: Got KEEPALIVE
2018-04-11 17:47:03 <TRACE> bgp1: BGP session established
2018-04-11 17:47:03 <TRACE> bgp1: Connected to table master
2018-04-11 17:47:03 <TRACE> bgp1: State changed to feed
2018-04-11 17:47:03 <TRACE> bgp1: State changed to up
2018-04-11 17:47:03 <TRACE> bgp1: Sending End-of-RIB
2018-04-11 17:47:03 <TRACE> bgp1: Got UPDATE
2018-04-11 17:47:03 <TRACE> bgp1: Got UPDATE
2018-04-11 17:47:03 <TRACE> bgp1: Got UPDATE
2018-04-11 17:47:03 <TRACE> bgp1: Got UPDATE
2018-04-11 17:47:03 <TRACE> bgp1: Got UPDATE
2018-04-11 17:47:03 <TRACE> ...
------------------------------------------------------------


------------------------------------------------------------

# birdc show protocols all bgp1
BIRD 1.4.5 ready.
name     proto    table    state  since       info
bgp1     BGP      master   up     17:47:03    Established
  Preference:     100
  Input filter:   ACCEPT
  Output filter:  REJECT
  Routes:         0 imported, 0 exported, 0 preferred
  Route change stats:     received   rejected   filtered    ignored
 accepted
    Import updates:              0          0          0          0
  0
    Import withdraws:            0          0        ---          0
  0
    Export updates:              0          0          0        ---
  0
    Export withdraws:            0        ---        ---        ---
  0
  BGP state:          Established
    Neighbor address: 192.168.200.1
    Neighbor AS:      64520
    Neighbor ID:      163.162.230.134
    Neighbor caps:    restart-aware
    Session:          external
    Source address:   192.168.200.6
    Hold timer:       62/90
    Keepalive timer:  22/30
------------------------------------------------------------


------------------------------------------------------------
# tcpdump -i eth1 tcp port 179 -vvv -XX
17:37:51.260061 IP (tos 0x0, ttl 1, id 49246, offset 0, flags [DF], proto
TCP (6), length 1353)
    192.168.200.1.bgp > vm-1.59873: Flags [P.], cksum 0xad25 (correct), seq
61:1362, ack 69, win 210, options [nop,nop,TS val 1643220008 ecr 25496328],
length 1301: BGP
        Update Message (2), length: 66
          Origin (1), length: 1, Flags [T]: Incomplete
            0x0000:  02
          Next Hop (3), length: 4, Flags [T]: 192.168.200.1
            0x0000:  c0a8 c801
          Multi Exit Discriminator (4), length: 4, Flags [O]: 100
            0x0000:  0000 0064
          AS Path (2), length: 4, Flags [T]: 64520
            0x0000:  0201 fc08
          Multi-Protocol Reach NLRI (14), length: 14, Flags [OE]:
            AFI: IPv4 (1), SAFI: Unicast (1)
            nexthop: 192.168.200.1, nh-length: 4, no SNPA
              163.162.230.199/32
            0x0000:  0001 0104 c0a8 c801 0020 a3a2 e6c7
....

BGP import route

RICCARDO RUSSO