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BGP Next Hop

BGP Next Hop

in the BGP configuration below, I am not sure why on R2 and R3 the next hop is not the IP address of R1 interfaces ,either( 192.168.12.1 or 192.168.13.1)
I mean on R2 to reach the loopback (3.3.3.3) of R3,  the Next-hop is showing the 192.168.13.3 and on R3 to reach the loopback(2.2.2.2) of R2, the Next-hop is showing 192.168.12.2
I thought the Next-hop should be the interfaces of R1either( 192.168.12.1 or 192.168.13.1)

I can ping 3.3.3.3 from R2 and 2.2.2.2 from R3

Thank you

bgp
R1#
interface Ethernet0/0
 ip address 192.168.12.1 255.255.255.0
!
interface Ethernet0/1
 ip address 192.168.13.1 255.255.255.0
!
router bgp 1
 bgp log-neighbor-changes
 neighbor 192.168.12.2 remote-as 1
 neighbor 192.168.12.2 route-reflector-client
 neighbor 192.168.12.2 next-hop-self
 neighbor 192.168.13.3 remote-as 1
 neighbor 192.168.13.3 route-reflector-client
 neighbor 192.168.13.3 next-hop-self

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R2#
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface Ethernet0/0
 ip address 192.168.12.2 255.255.255.0

router bgp 1
 network 2.2.2.2 mask 255.255.255.255
 neighbor 192.168.12.1 remote-as 1
 neighbor 192.168.23.3 remote-as 1

ip route 192.168.13.0 255.255.255.0 192.168.12.1

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R3#
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface Ethernet0/0
 ip address 192.168.13.3 255.255.255.0

router bgp 1
 network 3.3.3.3 mask 255.255.255.255
 neighbor 192.168.12.2 remote-as 1
 neighbor 192.168.13.1 remote-as 1

ip route 192.168.12.0 255.255.255.0 192.168.13.1

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R1#sh ip bgp
BGP table version is 7, local router ID is 192.168.13.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>i 2.2.2.2/32       192.168.12.2             0    100      0 i
 *>i 3.3.3.3/32       192.168.13.3             0    100      0 i
R1#

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R2#show ip bgp 
BGP table version is 3, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  2.2.2.2/32       0.0.0.0                  0         32768 i
 *>i 3.3.3.3/32       192.168.13.3             0    100      0 i
R2#

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R3#sh ip bgp
BGP table version is 3, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>i 2.2.2.2/32       192.168.12.2             0    100      0 i
 *>  3.3.3.3/32       0.0.0.0                  0         32768 i
R3#

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R2#ping 3.3.3.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R2#

R3#ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R3#
RoutersNetworking

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Last Comment
Benjamin Van Ditmars

8/22/2022 - Mon
Rafael

Look at R2.

What is "neighbor 192.168.23.3 remote-as 1" ?  Looks like the IP is incorrect.

did you mean it to say 192.168.13.x ??

-Rafael
jskfan

ASKER
Thank you,

corrected that and  cleared bgp, but still the same :
 
R2#sh run | sec bgp
router bgp 1
 bgp log-neighbor-changes
 network 2.2.2.2 mask 255.255.255.255
 neighbor 192.168.12.1 remote-as 1
 neighbor 192.168.13.3 remote-as 1
R2#

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R3#sh run | sec bgp
router bgp 1
 bgp log-neighbor-changes
 network 3.3.3.3 mask 255.255.255.255
 neighbor 192.168.12.2 remote-as 1
 neighbor 192.168.13.1 remote-as 1
R3#

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R2#sh ip bgp       
BGP table version is 3, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  2.2.2.2/32       0.0.0.0                  0         32768 i
 * i 3.3.3.3/32       192.168.13.3             0    100      0 i
 *>i                  192.168.13.3             0    100      0 i
R2#

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R3#sh ip bgp       
BGP table version is 3, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 * i 2.2.2.2/32       192.168.12.2             0    100      0 i
 *>i                  192.168.12.2             0    100      0 i
 *>  3.3.3.3/32       0.0.0.0                  0         32768 i
R3#

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Benjamin Van Ditmars

include connected interfaces in the redistributon
redistribure connected subnets on the routers that run ibgp
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jskfan

ASKER
After I redistributed connected, still the next-hop is the same:
R2#sh ip bgp
BGP table version is 5, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  2.2.2.2/32       0.0.0.0                  0         32768 i
 * i 3.3.3.3/32       192.168.13.3             0    100      0 i
 *>i                  192.168.13.3             0    100      0 i
 *>  192.168.12.0     0.0.0.0                  0         32768 ?
 r i 192.168.13.0     192.168.13.3             0    100      0 ?
 r>i                  192.168.13.3             0    100      0 ?
R2#

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R3#sh ip bgp
BGP table version is 5, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 * i 2.2.2.2/32       192.168.12.2             0    100      0 i
 *>i                  192.168.12.2             0    100      0 i
 *>  3.3.3.3/32       0.0.0.0                  0         32768 i
 r i 192.168.12.0     192.168.12.2             0    100      0 ?
 r>i                  192.168.12.2             0    100      0 ?
 *>  192.168.13.0     0.0.0.0                  0         32768 ?
R3#

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jskfan

ASKER
unless if the Next-Hop is always supposed to be the Last Hop before the destination Network...
Soulja

Next hop self only changes the prefixes learned from EBGP peers, not route reflected IBGP prefixes. There is an option to do next hop self all.  If your version has that option it will change the next hop for IBGP and EBGP learned prefixes.
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jskfan

ASKER
I removed the Next-hop- self.. I agree it does not have any impact.

What I need to point out is I can ping loopback of R3  from R2 with source loopback of R2 and can do the same thing from the R3 source loopback.

At this point is Next-Hop important ?
jskfan

ASKER
I will take it back (regarding the ping from loopback to loopback).. because I have static route that has achieved that on R2 and R3
R2(config)# ip route 3.3.3.3 255.255.255.255 192.168.12.1

R3(config)# ip route 2.2.2.2 255.255.255.255 192.168.13.1
Rafael

Can you redisplay the following and repost.

show ip route [bgp]
show ip bgp neighbors

Thanks
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Soulja

Next hop self isn't important if your concern is IBGP routes. You are already using a route reflector and as stated next hop self is normally for EBGP announced prefixes.
jskfan

ASKER
R1#sh ip route bgp 
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

R1#sh ip bgp nei
R1#sh ip bgp neighbors 
BGP neighbor is 2.2.2.2,  remote AS 1, internal link
  BGP version 4, remote router ID 0.0.0.0
  BGP state = Active
  Neighbor sessions:
    0 active, is not multisession capable (disabled)
    Stateful switchover support enabled: NO for session 0
  Message statistics:
    InQ depth is 0
    OutQ depth is 0
    
                         Sent       Rcvd
    Opens:                  0          0
    Notifications:          0          0
    Updates:                0          0
    Keepalives:             0          0
    Route Refresh:          0          0
    Total:                  0          0
  Default minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  BGP table version 4, neighbor version 1/4
  Output queue size : 0
  Index 0, Advertise bit 0
  Route-Reflector Client
  Slow-peer detection is disabled
  Slow-peer split-update-group dynamic is disabled
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               0          0
    Prefixes Total:                 0          0
    Implicit Withdraw:              0          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          0
    Used as multipath:            n/a          0

                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    Total:                                0          0
  Number of NLRIs in the update sent: max 2, min 0
  Last detected as dynamic slow peer: never
  Dynamic slow peer recovered: never
  Refresh Epoch: 1
  Last Sent Refresh Start-of-rib: never
  Last Sent Refresh End-of-rib: never
  Last Received Refresh Start-of-rib: never
  Last Received Refresh End-of-rib: never
                		       Sent	  Rcvd
	Refresh activity:	       ----	  ----
	  Refresh Start-of-RIB          0          0
	  Refresh End-of-RIB            0          0

  Address tracking is enabled, the RIB does have a route to 2.2.2.2
  Connections established 1; dropped 1
  Last reset 00:14:54, due to Active open failed
  Transport(tcp) path-mtu-discovery is enabled
  Graceful-Restart is disabled
  No active TCP connection

BGP neighbor is 3.3.3.3,  remote AS 1, internal link
  BGP version 4, remote router ID 0.0.0.0
  BGP state = Active
  Neighbor sessions:
    0 active, is not multisession capable (disabled)
    Stateful switchover support enabled: NO for session 0
  Message statistics:
    InQ depth is 0
    OutQ depth is 0
    
                         Sent       Rcvd
    Opens:                  0          0
    Notifications:          0          0
    Updates:                0          0
    Keepalives:             0          0
    Route Refresh:          0          0
    Total:                  0          0
  Default minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  BGP table version 4, neighbor version 1/4
  Output queue size : 0
  Index 0, Advertise bit 0
  Route-Reflector Client
  Slow-peer detection is disabled
  Slow-peer split-update-group dynamic is disabled
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               0          0
    Prefixes Total:                 0          0
    Implicit Withdraw:              0          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          0
    Used as multipath:            n/a          0
          
                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    Total:                                0          0
  Number of NLRIs in the update sent: max 2, min 0
  Last detected as dynamic slow peer: never
  Dynamic slow peer recovered: never
  Refresh Epoch: 1
  Last Sent Refresh Start-of-rib: never
  Last Sent Refresh End-of-rib: never
  Last Received Refresh Start-of-rib: never
  Last Received Refresh End-of-rib: never
				       Sent	  Rcvd
	Refresh activity:	       ----	  ----
	  Refresh Start-of-RIB          0          0
	  Refresh End-of-RIB            0          0

  Address tracking is enabled, the RIB does have a route to 3.3.3.3
  Connections established 1; dropped 1
  Last reset 00:14:11, due to Active open failed
  Transport(tcp) path-mtu-discovery is enabled
  Graceful-Restart is disabled
  No active TCP connection
          
R1# 

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R2#sh ip route bgp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set


R2#
R2#sh ip bgp neighbors 
BGP neighbor is 1.1.1.1,  remote AS 1, internal link
  BGP version 4, remote router ID 0.0.0.0
  BGP state = Idle
  Neighbor sessions:
    0 active, is not multisession capable (disabled)
    Stateful switchover support enabled: NO
  Default minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  BGP table version 3, neighbor version 1/3
  Output queue size : 0
  Index 0, Advertise bit 0
  Slow-peer detection is disabled
  Slow-peer split-update-group dynamic is disabled
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               0          0
    Prefixes Total:                 0          0
    Implicit Withdraw:              0          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          0
    Used as multipath:            n/a          0

                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    Total:                                0          0
  Number of NLRIs in the update sent: max 1, min 0
  Last detected as dynamic slow peer: never
  Dynamic slow peer recovered: never
  Refresh Epoch: 1
  Last Sent Refresh Start-of-rib: never
  Last Sent Refresh End-of-rib: never
  Last Received Refresh Start-of-rib: never
  Last Received Refresh End-of-rib: never
				       Sent	  Rcvd
	Refresh activity:	       ----	  ----
	  Refresh Start-of-RIB          0          0
	  Refresh End-of-RIB            0          0

  Address tracking is enabled, the RIB does not have a route to 1.1.1.1
  Connections established 1; dropped 1
  Last reset 00:15:41, due to Peer closed the session of session 1
  Transport(tcp) path-mtu-discovery is enabled
  Graceful-Restart is disabled
  No active TCP connection

BGP neighbor is 3.3.3.3,  remote AS 1, internal link
  BGP version 4, remote router ID 0.0.0.0
  BGP state = Idle
  Neighbor sessions:
    0 active, is not multisession capable (disabled)
    Stateful switchover support enabled: NO
  Default minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  BGP table version 3, neighbor version 1/3
  Output queue size : 0
  Index 0, Advertise bit 0
  Slow-peer detection is disabled
  Slow-peer split-update-group dynamic is disabled
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               0          0
    Prefixes Total:                 0          0
    Implicit Withdraw:              0          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          0
    Used as multipath:            n/a          0

                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    Total:                                0          0
  Number of NLRIs in the update sent: max 0, min 0
  Last detected as dynamic slow peer: never
  Dynamic slow peer recovered: never
  Refresh Epoch: 1
  Last Sent Refresh Start-of-rib: never
  Last Sent Refresh End-of-rib: never
  Last Received Refresh Start-of-rib: never
  Last Received Refresh End-of-rib: never
				       Sent	  Rcvd
	Refresh activity:	       ----	  ----
	  Refresh Start-of-RIB          0          0
	  Refresh End-of-RIB            0          0

  Address tracking is enabled, the RIB does not have a route to 3.3.3.3
  Connections established 0; dropped 0
  Last reset never
  Transport(tcp) path-mtu-discovery is enabled
  Graceful-Restart is disabled
  No active TCP connection

R2# 

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R3#sh ip route bgp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

R3#
R3#sh ip bgp neigh
R3#sh ip bgp neighbors 
BGP neighbor is 1.1.1.1,  remote AS 1, internal link
  BGP version 4, remote router ID 0.0.0.0
  BGP state = Idle
  Neighbor sessions:
    0 active, is not multisession capable (disabled)
    Stateful switchover support enabled: NO
  Default minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  BGP table version 3, neighbor version 1/3
  Output queue size : 0
  Index 0, Advertise bit 0
  Slow-peer detection is disabled
  Slow-peer split-update-group dynamic is disabled
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               0          0
    Prefixes Total:                 0          0
    Implicit Withdraw:              0          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          0
    Used as multipath:            n/a          0

                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    Total:                                0          0
  Number of NLRIs in the update sent: max 1, min 0
  Last detected as dynamic slow peer: never
  Dynamic slow peer recovered: never
  Refresh Epoch: 1
  Last Sent Refresh Start-of-rib: never
  Last Sent Refresh End-of-rib: never
  Last Received Refresh Start-of-rib: never
  Last Received Refresh End-of-rib: never
				       Sent	  Rcvd
	Refresh activity:	       ----	  ----
	  Refresh Start-of-RIB          0          0
	  Refresh End-of-RIB            0          0

  Address tracking is enabled, the RIB does not have a route to 1.1.1.1
  Connections established 1; dropped 1
  Last reset 00:16:25, due to Peer closed the session of session 1
  Transport(tcp) path-mtu-discovery is enabled
  Graceful-Restart is disabled
  No active TCP connection

BGP neighbor is 2.2.2.2,  remote AS 1, internal link
  BGP version 4, remote router ID 0.0.0.0
  BGP state = Idle
  Neighbor sessions:
    0 active, is not multisession capable (disabled)
    Stateful switchover support enabled: NO
  Default minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  BGP table version 3, neighbor version 1/3
  Output queue size : 0
  Index 0, Advertise bit 0
  Slow-peer detection is disabled
  Slow-peer split-update-group dynamic is disabled
                                 Sent       Rcvd
  Prefix activity:               ----       ----
    Prefixes Current:               0          0
    Prefixes Total:                 0          0
    Implicit Withdraw:              0          0
    Explicit Withdraw:              0          0
    Used as bestpath:             n/a          0
    Used as multipath:            n/a          0

                                   Outbound    Inbound
  Local Policy Denied Prefixes:    --------    -------
    Total:                                0          0
  Number of NLRIs in the update sent: max 0, min 0
  Last detected as dynamic slow peer: never
  Dynamic slow peer recovered: never
  Refresh Epoch: 1
  Last Sent Refresh Start-of-rib: never
  Last Sent Refresh End-of-rib: never
  Last Received Refresh Start-of-rib: never
  Last Received Refresh End-of-rib: never
				       Sent	  Rcvd
	Refresh activity:	       ----	  ----
	  Refresh Start-of-RIB          0          0
	  Refresh End-of-RIB            0          0

  Address tracking is enabled, the RIB does have a route to 2.2.2.2
  Connections established 0; dropped 0
  Last reset never
  Transport(tcp) path-mtu-discovery is enabled
  Graceful-Restart is disabled
  No active TCP connection

R3#

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Soulja

Post the output of sho ip route on your 3 routers. Currently it looks like you aren't even using any BGP routes.  So they must be resorting to an underlying IGP, connected, or static routes.
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Soulja

Another thing to remember is IBGP routes have a high adminstrative distance, so though they show in the BGP table, they usually don't show in the RIB.
SOLUTION
Benjamin Van Ditmars

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Soulja

Good catch Benjamin :)
Benjamin Van Ditmars

i had some time spare, and a couple of router from a lab on the desk. ;)
so i just build his setup fast.

he was also missing his redistribution of the connected loopback.
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jskfan

ASKER
Benjamin Van Ditmars

Thank you... Corrected as suggested



So on R2 next hop is the ip address of R3
*>i3.3.3.3/32       192.168.13.3             0    100      0 i


and on R3  the next hop is the ip address of R2

  Network          Next Hop            Metric LocPrf Weight Path
*>i2.2.2.2/32       192.168.12.2             0    100      0 i
ASKER CERTIFIED SOLUTION
Benjamin Van Ditmars

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jskfan

ASKER
in this lab, the neighborship  peering  is done on directly connected interfaces on the links 192.168.12.0 and 192.168.13.0

if I need to build the neighborship peering just on Loopback interfaces behind R2 and R3, is that possible ?
I mean in addition to Update-Source Loopback commands that will be issued on R2 and R3 then will I need to use static routes for reachability  between all routers including physical and loopback interfaces?

this is just brief question and I will test it in a LAB and post new question later

Thank you
jskfan

ASKER
Thank you
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Benjamin Van Ditmars

youre welcome