[c-nsp] eBGP/iBGP question

hank at interall.co.il hank at interall.co.il
Thu Dec 24 03:16:08 EST 2020


We are trying to figure out something with our BGP/OSPF setup.

We have two routers - each with a connection abroad hearing the full  
800K prefix table via eBGP.
These two routers are connected via iBGP (as well as OSPF), yet  
router1 only hears 19K prefixes from
router0 whereas router0 hears all 800K prefixes from router1:

Router0:
Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down   
St/PfxRcd
62.40.125.1       0 20965 5793423 1835150 454926506    0    0     5w4d  
      18791
83.97.88.89       0 21320 109164804 1835118 454926506    0    0      
5w4d     813154
128.139.220.90    0   378 102799517 102295152 454926506    0    0     
15w6d     804788

Router1:
Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down   
St/PfxRcd
62.40.125.65      0 20965 1879521  662142 174748912    0    0 05:38:56  
      18792
83.97.88.93       0 21320 38692259  568243 174748912    0    0  
05:39:04     813161
128.139.220.91    0   378 29861127 28724590 174748912    0    0     
15w6d      18799

How can we get Router1 which peers with 128.139.220.91 to hear the  
full routing table?

Ideas and clues welcome.

Relevant configs below.

Thanks,
Hank

Router0 config:

router bgp 378
  !
  bgp log neighbor changes detail
  address-family ipv4 unicast
   bgp dampening 5 750 3000 10
   redistribute static route-policy static-to-bgp
   redistribute ospf 378 metric 254 route-policy BezeqINT_LNS_BGP
!
route-policy static-to-bgp
!  Sets BGP community
   apply BGPv4-blackhole
end-policy
!
route-policy BezeqINT_LNS_BGP
   if (destination in pfx_IUCC_LNS_p1_permit) then
     set community (378:0)
   endif
end-policy
!
prefix-set pfx_IUCC_LNS_p1_permit
   10.64.10.2/32
end-set
  !
  neighbor-group ILAN
   remote-as 378
   address-family ipv4 unicast
    next-hop-self
  !
  neighbor 128.139.220.90
   use neighbor-group ILAN
   update-source Loopback0
   address-family ipv4 unicast
    maximum-prefix 1200000 75
    soft-reconfiguration inbound always
!
---------------------------------------------------

Router1


!
router bgp 378
  address-family ipv4 unicast
   bgp dampening 5 750 3000 10
   redistribute static route-policy static-to-bgp
  !
  neighbor 128.139.220.91
   use neighbor-group ILAN
   update-source Loopback0
   address-family ipv4 unicast
    maximum-prefix 1200000 75
    route-policy default_policy_pass_all out
    soft-reconfiguration inbound always
   !
!
neighbor-group ILAN
   remote-as 378
   address-family ipv4 unicast
    next-hop-self
!
route-policy static-to-bgp
   ! Just sets community
   apply BGPv4-blackhole
end-policy
!
route-policy default_policy_pass_all
   pass
end-policy




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