Mac address learned one way

[bo2112260285]

Dear All

My topology below:

R1(gi1/1)------------------EoSDH----------------------------(gi1/2)R2

gi1/1 MAC: aaaa.bbbb.cccc

gi1/2 MAC: dddd.eeee.ffff

I have an issue,the R1 connect to R2 directly over SDH network. I already configured IP address both side (192.168.1.x/24), but it's only MAC learned at the R2 router so I can't ping sucessfully from R1 to R2. When I go show arp command on R1 & R2, I saw R2 can learn the R1's MAC address but R1 can not learn R2's MAC address. Please help me know what is this issue and how to resolve?

Configuration

------R1

int gi1/1

ip address 192.168.1.2 255.255.255.0
end

show arp | i 192.168
Internet  192.168.1.1             0   Incomplete      ARPA  
Internet  192.168.1.2             -   aaaa.bbbb.cccc  ARPA   GigabitEthernet1/1

------R2

int gi1/2

ip address 192.168.1.1 255.255.255.0

no cdp enable

show arp | i 192.168

Internet  192.168.1.1             -   dddd.eeee.ffff  ARPA   GigabitEthernet1/2
Internet  192.168.1.2             0   aaaa.bbbb.cccc  ARPA   GigabitEthernet1/2

Thanks and Best Regards

[Peter Paluch]

Hi Bill,

Can you perform the debug arp on both routers while trying to ping 192.168.1.1 from 192.168.1.2, and post the output here? Outputs from both routers are necessary to determine whether the ARP requests are properly generated, arrive at the correct destination and whether the response is correctly constructed, sent back and correctly received.

Is the EoSDH circuit actually able to pass data in both directions? Have you verified that?

Best regards,

Peter