LDP neighbor issue

RouterOS Forwarding Protocols
1

Hi all,

I have a 3 MT setup that is showing up a ldp neighbor that I cannot explain. R1 is connected to R2 and R3. R2 and R3 are not connected directly. My question is how is R2 seeing R3 loopback address in /mpls ldp neighbors.

[admin@R1] /mpls ldp neighbor> print
Flags: X - disabled, D - dynamic, O - operational, T - sending-targeted-hello, V - vpls

TRANSPORT LOCAL-TRANSPORT PEER SEND-TARGETED ADDRESSES

0 DO 10.255.255.3 10.255.255.1 10.255.0.25:0 no 10.255.255.3
172.18.20.6
1 DO 10.255.255.2 10.255.255.1 10.255.255.2:0 no 10.255.255.2
172.18.20.2

[admin@R2] /mpls ldp neighbor> print
Flags: X - disabled, D - dynamic, O - operational, T - sending-targeted-hello, V - vpls

TRANSPORT LOCAL-TRANSPORT PEER SEND-TARGETED ADDRESSES

0 D 10.255.255.3 10.255.255.2 10.255.0.25:0 no
1 DO 10.255.255.1 10.255.255.2 10.255.255.1:0 no 10.255.255.1
172.18.20.1
172.18.20.5
192.168.74.47

[admin@R3] /mpls> ldp neighbor print
Flags: X - disabled, D - dynamic, O - operational, T - sending-targeted-hello, V - vpls

TRANSPORT LOCAL-TRANSPORT PEER SEND-TARGETED ADDRESSES

0 DO 10.255.255.1 10.255.255.3 10.255.255.1:0 no 10.255.255.1
172.18.20.1
172.18.20.5
192.168.74.47

2

Can you post your routing tables and LDP config?

3

[admin@R1] /ip> route print
Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit

DST-ADDRESS PREF-SRC GATEWAY DISTANCE

0 ADC 10.255.255.1/32 10.255.255.1 loopback 0
1 ADo 10.255.255.2/32 172.18.20.2 110
2 ADo 10.255.255.3/32 172.18.20.6 110
3 ADC 172.18.20.0/30 172.18.20.1 ether2 0
4 ADC 172.18.20.4/30 172.18.20.5 ether3 0
5 ADC 192.168.74.0/24 192.168.74.47 ether1 0


[admin@R1] /ip> /mpls ldp export

jan/02/1970 00:16:18 by RouterOS 5.24

software id = EBYF-BXDF

/mpls ldp
set distribute-for-default-route=no enabled=yes hop-limit=255 loop-detect=no
lsr-id=10.255.255.1 path-vector-limit=255 transport-address=10.255.255.1
use-explicit-null=no
/mpls ldp interface
add accept-dynamic-neighbors=yes disabled=no hello-interval=5s hold-time=15s
interface=ether2 transport-address=0.0.0.0
add accept-dynamic-neighbors=yes disabled=no hello-interval=5s hold-time=15s
interface=ether3 transport-address=0.0.0.0





[admin@R2] > ip route print
Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit

DST-ADDRESS PREF-SRC GATEWAY DISTANCE

0 ADo 10.255.255.1/32 172.18.20.1 110
1 ADC 10.255.255.2/32 10.255.255.2 loopback 0
2 ADo 10.255.255.3/32 172.18.20.1 110
3 ADC 172.18.20.0/30 172.18.20.2 ether1 0
4 ADo 172.18.20.4/30 172.18.20.1 110
5 ADo 192.168.74.0/24 172.18.20.1 110

[admin@R2] > mpls ldp export

jan/02/1970 00:15:52 by RouterOS 5.24

software id = QJQH-S3P8

/mpls ldp
set distribute-for-default-route=no enabled=yes hop-limit=255 loop-detect=no
lsr-id=10.255.255.2 path-vector-limit=255 transport-address=10.255.255.2
use-explicit-null=no
/mpls ldp interface
add accept-dynamic-neighbors=yes disabled=no hello-interval=5s hold-time=15s
interface=ether1 transport-address=0.0.0.0






[admin@R3] /ip route> print
Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit

DST-ADDRESS PREF-SRC GATEWAY DISTANCE

0 ADo 10.255.255.1/32 172.18.20.5 110
1 ADo 10.255.255.2/32 172.18.20.5 110
2 ADC 10.255.255.3/32 10.255.255.3 loopback 0
3 ADo 172.18.20.0/30 172.18.20.5 110
4 ADC 172.18.20.4/30 172.18.20.6 ether1 0
5 ADo 192.168.74.0/24 172.18.20.5 110

[admin@R3] /ip route> /mpls ldp export

jan/02/1970 00:15:13 by RouterOS 5.24

software id = SHZZ-0N1R

/mpls ldp
set distribute-for-default-route=no enabled=yes hop-limit=255 loop-detect=no
lsr-id=10.255.0.25 path-vector-limit=255 transport-address=10.255.255.3
use-explicit-null=no
/mpls ldp interface
add accept-dynamic-neighbors=yes disabled=no hello-interval=5s hold-time=15s
interface=ether1 transport-address=0.0.0.0