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BGP: part of routes are disappeared after restart bgp neighbor #35

Open xivamar opened 8 years ago

xivamar commented 8 years ago

Problem Description:

Part of BGP routes aren't added in routing table after restart bgp neighbor.

OpenSwitch version:

OpenSwitch 0.4.0 (Build: appliance-ops-0.4.0-master-20161012101714-dev)

Test Topology:

topologyipv4

Steps to reproduce the problem (see attached file):

  1. Configure DUTs as in attached file.

  2. Check routing table and bgp routing table via show ip route, show ip bgp on DUT1. All routes should be in the tables.

    OpenSwitch-1# show ip bgp 
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
             i internal, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

Local router-id 102.0.0.2
  Network          Next Hop            Metric LocPrf Weight Path
*> 100.0.0.0/23     0.0.0.0                  0      0  32768  i
*  101.0.0.0/20     101.0.0.1                0      0  32768 64501 i
*> 101.0.0.0/20     102.0.0.1                0      0  32768 64501 i
*  102.0.0.0/21     101.0.0.1                0      0  32768 64501 64502 i
*> 102.0.0.0/21     102.0.0.1                0      0  32768 64502 i
*> 103.0.0.0/22     101.0.0.1                0      0  32768 64501 64503 i
*> 103.0.0.0/22     102.0.0.1                0      0  32768 64501 64503 i
*> 120.0.0.0/24     101.0.0.1                0      0  32768 64501 64503 i
*> 120.0.0.0/24     102.0.0.1                0      0  32768 64501 64503 i
Total number of entries 9

OpenSwitch-1# show ip route 
Displaying ipv4 routes selected for forwarding
'[x/y]' denotes [distance/metric]
100.0.0.1/32,  1 unicast next-hops 
   via  loopback1,  [0/0],  connected
101.0.0.0/20,  1 unicast next-hops 
   via  101.0.0.1,  [20/0],  bgp
101.0.0.0/30,  1 unicast next-hops 
   via  eth3,  [0/0],  connected
102.0.0.0/21,  1 unicast next-hops 
   via  102.0.0.1,  [20/0],  bgp
102.0.0.0/30,  1 unicast next-hops 
   via  eth1,  [0/0],  connected
103.0.0.0/22,  1 unicast next-hops 
   via  101.0.0.1,  [20/0],  bgp
120.0.0.0/24,  1 unicast next-hops 
   via  101.0.0.1,  [20/0],  bgp
OpenSwitch-1#

  3. Restart bgp neighbor 102.0.0.1 on DUT1.

            OpenSwitch-1# conf ter
        OpenSwitch-1(config)# router bgp 64500
        OpenSwitch-1(config-router)# neighbor 102.0.0.1 shutdown 
        OpenSwitch-1(config-router)# no neighbor 102.0.0.1 shutdown 
        OpenSwitch-1(config-router)# end
        OpenSwitch-1#

  4. Check bgp routing table on DUT1. - NOK: Part of routes are disappeared.

    OpenSwitch-1# show ip bgp 
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
             i internal, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Local router-id 102.0.0.2
  Network          Next Hop            Metric LocPrf Weight Path
*> 100.0.0.0/23     0.0.0.0                  0      0  32768  i
*  101.0.0.0/20     101.0.0.1                0      0  32768 64501 i
*  102.0.0.0/21     101.0.0.1                0      0  32768 64501 64502 i
*> 102.0.0.0/21     102.0.0.1                0      0  32768 64502 i
*> 103.0.0.0/22     101.0.0.1                0      0  32768 64501 64503 i
*> 120.0.0.0/24     101.0.0.1                0      0  32768 64501 64503 i
Total number of entries 6
OpenSwitch-1#

If in step 3 use clear bgp * in and clear bgp * out commands result will be as in step 4.

config.txt