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MA5671A - OLT can't communicate with switch

Publication Date:  2016-06-13 Views:  199 Downloads:  0

Issue Description

customer have some device like below:
and he found that the OLT can't communicate with switch.

Alarm Information

the port in switch is down

Handling Process

1. first the port in switch is down, so we check the switch first ,we disable auto-negotiation, and force set speed and duplex manually, after that the port is up, but the 2 device still can't ping each other.
2. after more information, customer said the OLT is in route mode, so it's not because the vlan.
3. in OLT there are some security function, after check the status, we found that they are enabled.
4. we suggest customer to disable these functions.



security anti-ipspoofing enable

security anti-macspoofing enable     

customer feedback:
security anti-ipspoofing disable
security anti-macspoofing control-protocol ipv6oe disable
security anti-macspoofing disable
security anti-ipv6spoofing disable

and indeed, now it is working:

  PING 56  data bytes, press CTRL_C to break
    Reply from bytes=56 Sequence=1 ttl=255 time=10 ms
    Reply from bytes=56 Sequence=2 ttl=255 time=4 ms
    Reply from bytes=56 Sequence=3 ttl=255 time=4 ms
    Reply from bytes=56 Sequence=4 ttl=255 time=4 ms
    Reply from bytes=56 Sequence=5 ttl=255 time=4 ms

  --- ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 4/5/10 ms

Root Cause

1.the port auto-negotiation cause the port of switch down.

2.the security function cause the 2 deivces can't reach each other.


set the port force to 1000M, connected.and need to disable 2 security functions .


auto-negotiation function sometime will not work well for defferent devices. we need to force it manually.

security function should be enable follow the network design.