[quagga-users 14813] BGP flapping: BGP type 2 length 3300 is too large, attribute total length is 2309.

Hi,
after 3 years of operating quagga bgpd, i did have suddenly hit error
between two Quagga BGPD routers:

2017/09/30 20:05:47 BGP: 185.120.68.25: BGP type 2 length 3300 is too
large, attribute total length is 2309.  attr_endp is 0x55b24ff1f323.
endp is 0x55b24ff1ef3c

Routers do exchange these and flap indefinitely. Other peers than quagga
seem to be ok.

I encountered the error on 0.99.24.1-2 from Ubuntu, but it persists
after upgrading both nodes to 1.1.1-3

Do you have any idea why this happened after years of issue-less
operation and what can i do about it ? I am out of options here.

Bellow are both sides configs.

Thanks for any suggestions
Zdenek Janda




Config of router #1:




!
! quagga common template
!
hostname r2
password quagga
enable password quagga
!
!
! bgpd base template
!
log file /var/log/quagga/bgpd.log
!
! bgpd config of r2
!
router bgp 65200
 bgp router-id 185.120.68.3
 bgp confederation identifier 8646
 bgp confederation peers 65100
 network 185.120.68.0/22
 no synchronization
 no bgp enforce-first-as
 bgp always-compare-med
! bgp scan-time 15
!
 neighbor INT65100 peer-group
 neighbor INT65100 description CZ1 internal peering
 neighbor INT65100 timers 10 30
 neighbor INT65100 next-hop-self
 neighbor INT65100 send-community both
 neighbor INT65100 soft-reconfiguration inbound
!
 neighbor 185.120.68.25 remote-as 65100
 neighbor 185.120.68.25 peer-group INT65100
 neighbor 185.120.68.25 description r1
!
 neighbor INT65200 peer-group
 neighbor INT65200 description CZ2 internal peering
 neighbor INT65200 timers 10 30
 neighbor INT65200 next-hop-self
 neighbor INT65200 send-community both
 neighbor INT65200 soft-reconfiguration inbound
!
 neighbor 185.120.68.30 remote-as 65200
 neighbor 185.120.68.30 peer-group INT65200
 neighbor 185.120.68.30 description r4
!
 neighbor NIX peer-group
 neighbor NIX description NIX public route-servers
 neighbor NIX timers 10 30
 neighbor NIX next-hop-self
 neighbor NIX send-community both
 neighbor NIX soft-reconfiguration inbound
 neighbor NIX prefix-list GENOUT out
 neighbor NIX prefix-list NIXIN in
!
 neighbor 91.210.16.246 remote-as 6881
 neighbor 91.210.16.246 peer-group NIX
 neighbor 91.210.16.246 description nix1
!
 neighbor 91.210.16.245 remote-as 6881
 neighbor 91.210.16.245 peer-group NIX
 neighbor 91.210.16.245 description nix2
!
 neighbor 91.210.16.1 remote-as 47200
 neighbor 91.210.16.1 peer-group NIX
 neighbor 91.210.16.1 description nix3
!
 neighbor 91.210.16.2 remote-as 47200
 neighbor 91.210.16.2 peer-group NIX
 neighbor 91.210.16.2 description nix4
!
 neighbor NIXCIS peer-group
 neighbor NIXCIS description Cloudinfrastack generic peer group
 neighbor NIXCIS timers 10 30
 neighbor NIXCIS next-hop-self
 neighbor NIXCIS send-community both
 neighbor NIXCIS soft-reconfiguration inbound
 neighbor NIXCIS prefix-list GENOUT out
!
 neighbor 91.210.16.201 remote-as 6939
 neighbor 91.210.16.201 peer-group NIXCIS
 neighbor 91.210.16.201 description as-hurricane
!
 neighbor NET3 peer-group
 neighbor NET3 description Net3 generic peer group
 neighbor NET3 timers 10 30
 neighbor NET3 next-hop-self
 neighbor NET3 send-community both
 neighbor NET3 soft-reconfiguration inbound
!
 neighbor 185.120.69.195 remote-as 50980
 neighbor 185.120.69.195 peer-group NET3
 neighbor 185.120.69.195 description as-net3
!
 ip prefix-list NIXIN description NIX ip prefixes in
 ip prefix-list NIXIN seq 99 permit any
!
 ip prefix-list GENOUT description Cloudinfrastack ip prefixes out
 ip prefix-list GENOUT seq 10 permit 185.120.68.0/22 le 24
 ip prefix-list GENOUT seq 10 permit 185.133.196.0/22 le 24
 ip prefix-list GENOUT seq 99 deny any
!





Config of router #2:

!
! quagga common template
!
hostname r2
password quagga
enable password quagga
!
!
! bgpd base template
!
log file /var/log/quagga/bgpd.log
!
! bgpd config of r2
!
router bgp 65100
 bgp router-id 185.120.68.2
 bgp confederation identifier 8646
 bgp confederation peers 65200
 network 185.120.68.0/22
 no synchronization
 no bgp enforce-first-as
 bgp always-compare-med
! bgp scan-time 15
!
 neighbor INT65100 peer-group
 neighbor INT65100 description CZ1 internal peering
 neighbor INT65100 timers 10 30
 neighbor INT65100 next-hop-self
 neighbor INT65100 send-community both
 neighbor INT65100 soft-reconfiguration inbound
!
 neighbor 185.120.68.17 remote-as 65100
 neighbor 185.120.68.17 peer-group INT65100
 neighbor 185.120.68.17 description r1
!
 neighbor INT65200 peer-group
 neighbor INT65200 description CZ2 internal peering
 neighbor INT65200 timers 10 30
 neighbor INT65200 next-hop-self
 neighbor INT65200 send-community both
 neighbor INT65200 soft-reconfiguration inbound
!
 neighbor 185.120.68.26 remote-as 65200
 neighbor 185.120.68.26 peer-group INT65200
 neighbor 185.120.68.26 description r3
!
 neighbor OFX peer-group
 neighbor OFX description OFX public route-servers
 neighbor OFX timers 10 30
 neighbor OFX next-hop-self
 neighbor OFX send-community both
 neighbor OFX soft-reconfiguration inbound
 neighbor OFX route-map OFX-RM-OUT out
 neighbor OFX prefix-list OFX-PF-IN in
!
 neighbor 185.99.116.1 remote-as 33877
 neighbor 185.99.116.1 peer-group OFX
 neighbor 185.99.116.1 description ofx1
!
 neighbor 185.99.116.2 remote-as 33877
 neighbor 185.99.116.2 peer-group OFX
 neighbor 185.99.116.2 description ofx2
!
 neighbor PEERINGCZ peer-group
 neighbor PEERINGCZ description Cloudinfrastack Peering.cz peer group
 neighbor PEERINGCZ timers 10 30
 neighbor PEERINGCZ next-hop-self
 neighbor PEERINGCZ send-community both
 neighbor PEERINGCZ soft-reconfiguration inbound
 neighbor PEERINGCZ route-map PEERINGCZ-RM-OUT out
 neighbor PEERINGCZ prefix-list PEERINGCZ-PF-IN in
!
 neighbor 91.213.211.1 remote-as 61195
 neighbor 91.213.211.1 peer-group PEERINGCZ
 neighbor 91.213.211.1 description as-peeringcz1
!
 neighbor 91.213.211.2 remote-as 61195
 neighbor 91.213.211.2 peer-group PEERINGCZ
 neighbor 91.213.211.2 description as-peeringcz2
!
 neighbor 91.213.211.100 remote-as 39392
 neighbor 91.213.211.100 peer-group PEERINGCZ
 neighbor 91.213.211.100 description as-supernetworkpr1
!
 neighbor 91.213.211.101 remote-as 39392
 neighbor 91.213.211.101 peer-group PEERINGCZ
 neighbor 91.213.211.101 description as-supernetworkpr2
!
 neighbor SUPERNETWORK peer-group
 neighbor SUPERNETWORK description Supernetwork peer group
 neighbor SUPERNETWORK timers 10 30
 neighbor SUPERNETWORK next-hop-self
 neighbor SUPERNETWORK send-community both
 neighbor SUPERNETWORK soft-reconfiguration inbound
 neighbor SUPERNETWORK route-map SUPERNETWORK-RM-OUT out
 neighbor SUPERNETWORK prefix-list SUPERNETWORK-PF-IN in
!
 neighbor 88.86.99.193 remote-as 39392
 neighbor 88.86.99.193 peer-group SUPERNETWORK
 neighbor 88.86.99.193 description as-supernetworktr1
!
 neighbor HURRICANE peer-group
 neighbor HURRICANE description Cloudinfrastack generic peer group
 neighbor HURRICANE timers 10 30
 neighbor HURRICANE next-hop-self
 neighbor HURRICANE send-community both
 neighbor HURRICANE soft-reconfiguration inbound
 neighbor HURRICANE route-map HURRICANE-RM-OUT out
 neighbor HURRICANE prefix-list HURRICANE-PF-IN in
!
 neighbor 91.213.211.118 remote-as 6939
 neighbor 91.213.211.118 peer-group HURRICANE
 neighbor 91.213.211.118 description as-hurricanepr2
!
 neighbor COGENT peer-group
 neighbor COGENT description Cogent peer group
 neighbor COGENT timers 10 30
 neighbor COGENT next-hop-self
 neighbor COGENT send-community both
 neighbor COGENT soft-reconfiguration inbound
 neighbor COGENT route-map COGENT-RM-OUT out
 neighbor COGENT prefix-list COGENT-PF-IN in
!
 neighbor 149.6.25.89 remote-as 174
 neighbor 149.6.25.89 peer-group COGENT
 neighbor 149.6.25.89 description as-cogent
!
 neighbor LEVEL3 peer-group
 neighbor LEVEL3 description Cloudinfrastack Level3 peer group
 neighbor LEVEL3 timers 10 30
 neighbor LEVEL3 next-hop-self
 neighbor LEVEL3 send-community both
 neighbor LEVEL3 soft-reconfiguration inbound
 neighbor LEVEL3 route-map LEVEL3-RM-OUT out
 neighbor LEVEL3 prefix-list LEVEL3-PF-IN in
!
 neighbor 212.162.8.177 remote-as 3356
 neighbor 212.162.8.177 peer-group LEVEL3
 neighbor 212.162.8.177 description as-level3
!
 neighbor TELIA peer-group
 neighbor TELIA description Cloudinfrastack Telia peer group
 neighbor TELIA timers 10 30
 neighbor TELIA next-hop-self
 neighbor TELIA send-community both
 neighbor TELIA soft-reconfiguration inbound
 neighbor TELIA route-map TELIA-RM-OUT out
 neighbor TELIA prefix-list TELIA-PF-IN in
!
 neighbor 213.248.77.138 remote-as 1299
 neighbor 213.248.77.138 peer-group TELIA
 neighbor 213.248.77.138 description as-telia
!
 ip prefix-list OFX-PF-IN description OFX ip prefixes in
 ip prefix-list OFX-PF-IN seq 99 permit any
!
 ip prefix-list PEERINGCZ-PF-IN description PEERINGCZ ip prefixes in
 ip prefix-list PEERINGCZ-PF-IN seq 99 permit any
!
 ip prefix-list SUPERNETWORK-PF-IN description SUPERNETWORK ip prefixes in
 ip prefix-list SUPERNETWORK-PF-IN seq 99 permit any
!
 ip prefix-list HURRICANE-PF-IN description HURRICANE ip prefixes in
 ip prefix-list HURRICANE-PF-IN seq 99 permit any
!
 ip prefix-list COGENT-PF-IN description COGENT ip prefixes in
 ip prefix-list COGENT-PF-IN seq 99 permit any
!
 ip prefix-list LEVEL3-PF-IN description LEVEL3 ip prefixes in
 ip prefix-list LEVEL3-PF-IN seq 99 permit any
!
 ip prefix-list TELIA-PF-IN description TELIA ip prefixes in
 ip prefix-list TELIA-PF-IN seq 99 permit any
!
 ip prefix-list GEN-PF-OUT description Generic ip prefixes out
 ip prefix-list GEN-PF-OUT seq 10 permit 185.133.196.0/22
 ip prefix-list GEN-PF-OUT seq 20 permit 185.120.68.0/22
 ip prefix-list GEN-PF-OUT seq 99 deny any
!
route-map OFX-RM-OUT permit 10
  match ip address prefix-list GEN-PF-OUT
  set weight 0
  set local-preference 100
!
route-map PEERINGCZ-RM-OUT permit 10
  match ip address prefix-list GEN-PF-OUT
  set weight 0
  set local-preference 100
!
route-map SUPERNETWORK-RM-OUT permit 10
  match ip address prefix-list GEN-PF-OUT
  set weight 0
  set local-preference 100
!
route-map HURRICANE-RM-OUT permit 10
  match ip address prefix-list GEN-PF-OUT
  set weight 0
  set local-preference 100
!
route-map COGENT-RM-OUT permit 10
  match ip address prefix-list GEN-PF-OUT
  set weight 0
  set local-preference 100
!
route-map LEVEL3-RM-OUT permit 10
  match ip address prefix-list GEN-PF-OUT
  set weight 0
  set local-preference 100
!
route-map TELIA-RM-OUT permit 10
  match ip address prefix-list GEN-PF-OUT
  set weight 0
  set local-preference 100
!