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In our enterprise MPLS network we are using 192.168.20.0/24 subnet, in this subnet we have not assigned the IP 192.168.20.200/30 & 204/30, But still these subnets are reachable . Are these NNI IP ...Please explain.

In our enterprise MPLS network we are using 192.168.20.0/24 subnet, in this subnet we have not assigned the IP 192.168.20.200/30 & 204/30, But still these subnets are reachable . Are these NNI IP ...Please explain.

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Gold

R you on customer site ? If

R you on customer site ? If yes check with your service provider and tell them to remove these subnet advertisement to your network.You are only getting routes not actual host allocating to them

 

Regards,

Ashish

I have checked with ISP,

I have checked with ISP, there response is like below:

Those are the NNI to GBNET IPs for Dominican Republic. They are Network IPs. You should be able to ping them-that means they are working.

WANRT01#show  ip route | include 192.168.20.20
B        192.168.20.200/30 [20/0] via 192.168.20.226, 02:18:29
B        192.168.20.204/30 [20/0] via 192.168.20.226, 02:18:29

 

Here its shows from any of our MPLS site we are able to trace the IP and it seems like, 192.168.20.204/30 is one more site but in actual its not.

 

 

INMUMWANRT01#ping 192.168.20.205
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.20.205, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 224/232/260 ms
INMUMWANRT01#trace              
INMUMWANRT01#traceroute 192.168.20.205
Type escape sequence to abort.
Tracing the route to 192.168.20.205
VRF info: (vrf in name/id, vrf out name/id)
  1 192.168.20.226 24 msec 24 msec 24 msec
  2 192.168.20.206 [AS 8035] 232 msec 232 msec 252 msec
  3 192.168.20.205 [AS 8035] 224 msec 224 msec *

Gold

I feel this are point to

I feel this are point to point devices interface IP address like PE( provider edge ) to CE (Customer edge) ,not sure about ur network topology but check ur remote device IP address pointing toward SP. What do u mean by NNI , is it network node interface ? in case if they have any ME switches on the remote end.

 

Are these subnets causing any problm in your network, I meant duplicate IP address or redirecting traffic in wrong direction? You can use inbound prefix-list in BGP to filter those.

 

Regards

Ashish

As of now its not causing any

As of now its not causing any issue.

as you are saying "I feel this are point to point devices interface IP address like PE( provider edge ) to CE (Customer edge) ". If its is...Then we must be able to telnet our CE device...but we are not.

NNI means i guess

a network-to-network interface (NNI) is an interface which specifies signaling and management functions between two networks.

 

 

ISP doesn;t have last mile

ISP doesn;t have last mile services, so it has used another intermediate service provider and its's using that /30 subnet.

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