Smart MX 5600T release: MA5600V800R003C02B108SP01.
The DSLAM's ppp subscribers on VLAN 2490 can not get IP.
Network diagram: ISP Subscribers -- Huawei DSLAM -- External BRAS.
After the right test on DSLAM. The ISP found the BRAS problem. They reset its interface to our DSLAM and the service was recovered. MPLS interface's 441 on ISP device malfunction.
1.Check the vlan traffic on the DSLAM. Command:
#display statistics vlan 2490.
2.After analyzed the traffic, if we have got upstream traffic and we don't have downstream traffic.
3.Check the connectivity to BRAS: Command:
#display mac-address vlan 2490.
We should have an MAC-entry on uplink port from BRAS machine.
eth 0013-c308-fa60 dynamic 0 /19/0 - 2543 << Vlan and MAC associated on uplink port.
4.If we don't have this entry. We can locate this problem is came from BRAS/Datacom department.