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]()
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#
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
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
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
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
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#
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#
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#
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#
Architect - Network Engineer - Instructor
CERTIFIED EXPERT
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
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
Thank you,
corrected that and cleared bgp, but still the same :
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#
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#
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#
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#
Sr Network Engineer
CERTIFIED EXPERT
include connected interfaces in the redistributon
redistribure connected subnets on the routers that run ibgp
redistribure connected subnets on the routers that run ibgp
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#
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#
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.
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 ?
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 ?
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
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
Architect - Network Engineer - Instructor
CERTIFIED EXPERT
Can you redisplay the following and repost.
show ip route [bgp]
show ip bgp neighbors
Thanks
show ip route [bgp]
show ip bgp neighbors
Thanks
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.
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#
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#
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#
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.
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.
Sr Network Engineer
CERTIFIED EXPERT
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.
so i just build his setup fast.
he was also missing his redistribution of the connected loopback.
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
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
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
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