HI,
In my lab, I have two routers which like this, they can't connect each other whith eBGP,
OA-SH ------------- CustomerA-SH
OA-SH run BGP AS 65001 and CustomerA-SH run BGP AS 65002
the configuration :
admin@oashanghai1.OA-SH (routing[type=default-instance])# show
type default-instance
interface rtg-int-oash
name rtg-int-oash
ip-address 10.0.0.1
exit
routing-protocol bgp
type bgp
local-as 65001
router-id 10.0.0.1
address-family ipv4-unicast
afi-safi ipv4-unicast
network 10.0.254.0/24
network-address 10.0.254.0/24
exit
network 192.168.61.0/24
network-address 192.168.61.0/24
exit
exit
neighbor 10.0.0.3
neighbor-address 10.0.0.3
neighbor-as 65001
transport
local-address
routing-interface rtg-int-oash
exit
exit
address-family ipv4-unicast
afi-safi ipv4-unicast
next-hop-self true
exit
exit
neighbor 10.0.0.2
neighbor-address 10.0.0.2
neighbor-as 65001
transport
local-address
routing-interface rtg-int-oash
exit
exit
address-family ipv4-unicast
afi-safi ipv4-unicast
next-hop-self true
exit
exit
neighbor 10.0.0.9
neighbor-address 10.0.0.9
neighbor-as 65002
local-as 65001
transport
local-address
routing-interface rtg-int-oash
exit
exit
address-family ipv4-unicast
afi-safi ipv4-unicast
next-hop-self true
exit
exit
exit
admin@CustomerA-SH.CustomerA-SH (routing[type=default-instance])# show
type default-instance
interface rt-int-sh1
name rt-int-sh1
ip-address 10.0.0.9
exit
routing-protocol bgp
type bgp
local-as 65002
router-id 10.0.0.9
address-family ipv4-unicast
afi-safi ipv4-unicast
network 192.168.64.0/24
network-address 192.168.64.0/24
exit
exit
neighbor 10.0.0.1
neighbor-address 10.0.0.1
neighbor-as 65001
local-as 65002
transport
local-address
routing-interface rt-int-sh1
exit
exit
address-family ipv4-unicast
afi-safi ipv4-unicast
next-hop-self true
exit
exit
exit
admin@oashanghai1.OA-SH# show bgp neighbors 10.0.0.9
Sat 2019-10-12 09:24:31 CST
BGP neighbor is 10.0.0.9, remote AS 65002, local AS 65001, external link
BGP version 4, remote router ID 0.0.0.0
BGP state = Idle
Last read 23:35:14, Last write 00:02:18
Hold time is 90, keepalive interval is 30 seconds
Configured hold time is 90, keepalive interval is 30 seconds
Message statistics:
Inq depth is 0
Outq depth is 0
Sent Rcvd
Opens: 469 0
Notifications: 938 0
Updates: 0 0
Keepalives: 0 0
Route Refresh: 0 0
Capability: 0 0
Total: 1407 0
Minimum time between advertisement runs is 30 seconds
Update source is rtg-int-oash
For address family: IPv4 Unicast
Not part of any update group
Inbound soft reconfiguration allowed
NEXT_HOP is always this router
Community attribute sent to this neighbor(all)
0 accepted prefixes
Connections established 0; dropped 0
Last reset 23:35:14, due to NOTIFICATION sent (Cease/Connection collision resolution)
Local host: 10.0.0.1, Local port: 33507
Foreign host: 10.0.0.9, Foreign port: 179
Nexthop: 10.0.0.1
Nexthop global: ::
Nexthop local: ::
BGP connection: non shared network
BGP Connect Retry Timer in Seconds: 30
Next start timer due in 43 seconds
Read thread: off Write thread: off
Completed in 0.37 seconds
admin@oashanghai1.OA-SH# show bgp summary
Sat 2019-10-12 09:25:10 CST
IPv4 Unicast Summary:
BGP router identifier 10.0.0.1, local AS number 65001 vrf-id 0
BGP table version 3
RIB entries 7, using 1064 bytes of memory
Peers 4, using 82 KiB of memory
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.0.0.2 4 65001 2834 2834 0 0 0 23:35:29 1
10.0.0.3 4 65001 2835 2835 0 0 0 23:35:48 1
10.0.0.9 4 65002 0 1407 0 0 0 never Idle
Total number of neighbors 3
Completed in 0.35 seconds
admin@oashanghai1.OA-SH# show bgp force
Sat 2019-10-12 09:29:28 CST
BGP table version is 3, local router ID is 10.0.0.1, vrf id 0
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
10.0.254.0/24 0.0.0.0 0 32768 i
*> 192.168.61.0 0.0.0.0 0 32768 i
*>i192.168.62.0 10.0.0.2 0 100 0 i
*>i192.168.63.0 10.0.0.3 0 100 0 i
Displayed 4 routes and 4 total paths
Completed in 0.33 seconds
admin@CustomerA-SH.CustomerA-SH# show bgp neighbors
Sat 2019-10-12 09:25:01 CST
BGP neighbor is 10.0.0.1, remote AS 65001, local AS 65002, external link
BGP version 4, remote router ID 0.0.0.0
BGP state = OpenSent
Last read 23:45:32, Last write 00:00:15
Hold time is 90, keepalive interval is 30 seconds
Configured hold time is 90, keepalive interval is 30 seconds
Message statistics:
Inq depth is 0
Outq depth is 0
Sent Rcvd
Opens: 939 0
Notifications: 1874 0
Updates: 0 0
Keepalives: 0 0
Route Refresh: 0 0
Capability: 0 0
Total: 2813 0
Minimum time between advertisement runs is 30 seconds
Update source is rt-int-sh1
For address family: IPv4 Unicast
Not part of any update group
Inbound soft reconfiguration allowed
NEXT_HOP is always this router
Community attribute sent to this neighbor(all)
0 accepted prefixes
Connections established 0; dropped 0
Last reset 23:45:32, due to NOTIFICATION sent (Hold Timer Expired)
Local host: 10.0.0.9, Local port: 43669
Foreign host: 10.0.0.1, Foreign port: 179
Nexthop: 10.0.0.9
Nexthop global: ::
Nexthop local: ::
BGP connection: shared network
BGP Connect Retry Timer in Seconds: 30
Read thread: on Write thread: on
Completed in 0.39 seconds
admin@CustomerA-SH.CustomerA-SH# show bgp summary
Sat 2019-10-12 09:25:59 CST
IPv4 Unicast Summary:
BGP router identifier 10.0.0.9, local AS number 65002 vrf-id 0
BGP table version 1
RIB entries 1, using 152 bytes of memory
Peers 1, using 21 KiB of memory
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.0.0.1 4 65001 0 2813 0 0 0 never OpenSent
Total number of neighbors 1
Completed in 0.39 seconds
admin@CustomerA-SH.CustomerA-SH# show bgp force
Sat 2019-10-12 09:29:54 CST
BGP table version is 1, local router ID is 10.0.0.9, vrf id 0
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 192.168.64.0 0.0.0.0 0 32768 i
Displayed 1 routes and 1 total paths
Completed in 0.38 seconds
It seems that the BGP status between the two routers is 'OpenSent'. Which means they can't connect BGP correctly. Is there anything that I missed?
------------------------------
Alex Fang
engineer
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