Closed
Description
Please the issue detail below , this looks like CLI sequencing issue.
R5-----------------------R6
14.1.1.1 14.1.1.2
lo(105.105.105.105) ( 106.106.106.106)
R5 config :
router bgp 3
neighbor 105.105.105.105 remote-as 2
neighbor 105.105.105.105 ebgp-multihop 255
neighbor 105.105.105.105 update-source 106.106.106.106
rfp full-table-download off
R6 config:
router bgp 2
neighbor 106.106.106.106 remote-as 3
neighbor 106.106.106.106 ebgp-multihop 255
neighbor 106.106.106.106 update-source 105.105.105.105
rfp full-table-download off
In above config please note that ebgp-multihop cli is configure before the update source
when this config is applied Ebgp BGP session getting stuck in Active state , clear bgp also did not helped
If i change the sequence like below ( update source command first and ebgp-multihop at the end )
session coming up fine.
router bgp 2
neighbor 106.106.106.106 remote-as 3
neighbor 106.106.106.106 update-source 105.105.105.105
neighbor 106.106.106.106 ebgp-multihop 255
rfp full-table-download off
Logs during issue state , TCP connection itself failed
R5:
2018/10/30 00:52:11 BGP: 106.106.106.106 [FSM] BGP_Stop (Active->Idle), fd -1
2018/10/30 00:52:11 BGP: 106.106.106.106 went from Active to Idle
2018/10/30 00:52:12 BGP: 106.106.106.106 [FSM] Timer (start timer expire).
2018/10/30 00:52:12 BGP: 106.106.106.106 [FSM] BGP_Start (Idle->Connect), fd -1
2018/10/30 00:52:12 BGP: 106.106.106.106 [FSM] Waiting for NHT
2018/10/30 00:52:12 BGP: 106.106.106.106 went from Idle to Connect
2018/10/30 00:52:12 BGP: 106.106.106.106 [FSM] TCP_connection_open_failed (Connect->Active), fd -1
2018/10/30 00:52:12 BGP: 106.106.106.106 went from Connect to Active
R6:
2018/10/30 00:52:29 BGP: 105.105.105.105 [FSM] BGP_Stop (Active->Idle), fd -1
2018/10/30 00:52:29 BGP: 105.105.105.105 went from Active to Idle
2018/10/30 00:52:30 BGP: 105.105.105.105 [FSM] Timer (start timer expire).
2018/10/30 00:52:30 BGP: 105.105.105.105 [FSM] BGP_Start (Idle->Connect), fd -1
2018/10/30 00:52:30 BGP: 105.105.105.105 [FSM] Waiting for NHT
2018/10/30 00:52:30 BGP: 105.105.105.105 went from Idle to Connect
2018/10/30 00:52:30 BGP: 105.105.105.105 [FSM] TCP_connection_open_failed (Connect->Active), fd -1
2018/10/30 00:52:30 BGP: 105.105.105.105 went from Connect to Active
Full config of R5 and R6:-
R5 Config
frr defaults traditional
hostname dev
log syslog informational
no ipv6 forwarding
hostname R5
service integrated-vtysh-config
username cumulus nopassword
!
debug bgp neighbor-events
!
interface ens161
ip address 13.1.1.2/24
!
interface ens192
ip address 14.1.1.1/24
!
interface lo
ip address 105.105.105.105/32
!
router bgp 2
neighbor 106.106.106.106 remote-as 3
neighbor 106.106.106.106 ebgp-multihop 255
neighbor 106.106.106.106 update-source 105.105.105.105
rfp full-table-download off
!
router ospf
ospf router-id 105.105.105.105
passive-interface lo
network 13.1.1.0/24 area 0
network 14.1.1.0/24 area 0
network 105.105.105.105/32 area 0
!
line vty
!
End
R6 Config
hostname dev
log syslog informational
no ipv6 forwarding
hostname R6
service integrated-vtysh-config
username cumulus nopassword
!
debug bgp neighbor-events
debug bgp update-groups
debug bgp zebra
!
ip route 44.4.4.4/32 blackhole
ip route 44.44.4.4/32 blackhole
!
interface ens192
ip address 14.1.1.2/24
!
interface lo
ip address 106.106.106.106/32
!
router bgp 3
neighbor 105.105.105.105 remote-as 2
neighbor 105.105.105.105 ebgp-multihop 255
neighbor 105.105.105.105 update-source 106.106.106.106
rfp full-table-download off
!
router ospf
ospf router-id 106.106.106.106
passive-interface lo
network 14.1.1.0/24 area 0
network 106.106.106.106/32 area 0
!
ip prefix-list R6 seq 5 permit 27.0.0.0/8
ip prefix-list R6 seq 10 permit 27.0.0.0/8 le 32
!
route-map R6 permit 10
match ip address prefix-list R6
!
line vty
!
end