[FROG] ibgp regression on 8.5.2 ?

[mike tancsa]

I was updating an internal distribution router that got wedged in vtysh 
from 8.5 to 8.5.2 and found all my ibgp peers would not come up.  Same 
error on the half dozen peers

Jun 29 14:00:55 ibgp-4 bgpd[38150]: [HZN6M-XRM1G] %NOTIFICATION: 
received from neighbor xx.yy.zz.251 3/4 (UPDATE Message Error/Attribute 
Flags Error) 14 bytes 80 1a 0b 01 00 0b 00 00 00 00 00 00 00 01
Jun 29 14:01:00 ibgp-4 bgpd[38150]: [HZN6M-XRM1G] %NOTIFICATION: 
received from neighbor xx.yy.zz.251 3/4 (UPDATE Message Error/Attribute 
Flags Error) 14 bytes 80 1a 0b 01 00 0b 00 00 00 00 00 00 00 01
Jun 29 14:01:05 ibgp-4 bgpd[38150]: [HZN6M-XRM1G] %NOTIFICATION: sent to 
neighbor xx.yy.zz.251 3/4 (UPDATE Message Error/Attribute Flags Error) 
14 bytes c0 1a 0b 01 0

On the older versions of frr,

[NYD0B-A3BTB][EC 33554433] AIGP attribute must be flagged as "Transitive"
[HZN6M-XRM1G] %NOTIFICATION: sent to neighbor xx.yy.zz.241 3/4 (UPDATE 
Message Error/Attribute Flags Error) 14 bytes 80 1a 0b 01 0
[GW152-RVASS][EC 33554455] bgp_process_packet: BGP UPDATE receipt failed 
for peer: xx.yy.zz.241

I downgraded from 8.5.2 to 8.5.1 and all was good. Also, another peer 
thats still running 7.x was fine with it all.


Nothing special about the config. One of the untouched boxes running 8.5

  neighbor THOTLAN peer-group
  neighbor THOTLAN remote-as 11647
  neighbor THOTLAN description Core1LanEx
  neighbor THOTLAN update-source [dot.251]
  neighbor .241 peer-group HOTLAN
  neighbor .241 description The box the flipped out
  neighbor .241 bfd
   neighbor THOTLAN activate
   neighbor THOTLAN next-hop-self
   neighbor THOTLAN weight 111

The box I tried to upgrade from 8.5 to 8.5.2 that then went back to 8.5.1

  neighbor THOTLAN peer-group
  neighbor THOTLAN remote-as 11647
  neighbor THOTLAN update-source [dot.241]
  neighbor THOTLAN timers 16 50
  neighbor .251 description One of the many other peers that didnt like me
  neighbor .251 bfd
   neighbor THOTLAN activate
   neighbor THOTLAN next-hop-self
   neighbor THOTLAN soft-reconfiguration inbound
   neighbor THOTLAN weight 109


     ---Mike