Comparison of H901MPLA, H902MPLA and H903MPLA

MPLA board is the main control board of MA5800 X7/15/17. It is the core of the system control and service switching and aggregation. The MPLA board can also function as the management and control core of the integrated network management system (NMS). It communicates with service boards about the key management and control information through the master/slave serial port and inband GE/10GE channel. In this manner, the MPLA board configures, manages, and controls the device, and also implements the simple route protocol functions.

There are three hardware versions of MPLA, H901MPLA, H902MPLA and H903MPLA, Below is a detailed comparison lists among the three versions, “Yes” indicates “supported” and “No” indicates “not supported”.

Board Specifications	H901MPLA	H902MPLA	H903MPLA
Bandwidth per slot (load balancing mode)	100 Gbit/s	100 Gbit/s	100 Gbit/s
Upstream or cascading port	4 x 10GE/GE ports	4 x 10GE/GE ports	4 x 10GE/GE ports
ALM port	No	No	No
BITS/TOD port	No	No	No
MAC address table size	262143	262143	262143
Access ONTs	17408	17408	17408
Multicast users	17408	17408	17408
Static programs	·4096 (earlier than V100R017C00) ·8192 (V100R017C00 and later versions)	8192	8192
Online programs	V100R016C00: 4000 V100R016C10: · IPv4: 4000 · IPv6: 2000 V100R017C10 and later versions: · IPv4: 8000 · IPv6: 2000	·IPv4: 8000 ·IPv6: 2000	·IPv4: 8000 ·IPv6: 2000
IPv4 routing table size	65536	65536	65536
IPv6 routing table size	16384	16384	16384
Service ports	139264	139264	139264
ND table size	16384	16384	16384
ARP table size	·66048 (earlier than V100R017C10) · 98816 (V100R017C10) ·131072 (V100R018C00 and later   versions)	·66048 (V100R017C00) ·98816 (V100R017C10 version) ·131072 (V100R018C00 and later   versions)	131072
Ethernet synchronization	Yes	Yes	Yes
1588v2	Yes	Yes	Yes
1588ACR	Yes	Yes	Yes
D-CCAP	Yes	Yes	Yes

When configuring the boards of the MA5800 series OLT MA5800-X7/X15/X17, if both the active and standby control boards are configured, you need to periodically check whether the data of the active control board is synchronized to the standby control board to ensure reliable running of the system.

If necessary (for example, the active control board is faulty), you need to manually perform active/standby switchover to improve reliability of the system. An active/standby switchover involves only control plane switchover. The forwarding plane works in load sharing mode and therefore it continuously forwards services.

When the software version of the active control board is inconsistent with the software version of the standby control board, the system capacity for backing up the service is affected. When the active control board is faulty, the active/standby switchover may fail, or the service cannot fully recover after the active/standby switchover.

Software version of MPLA are in below:

Part Number	External Model	Description	Start Version
03022XTN	H901MPLA	Main Processing   Board	V100R015C00
03024GDV	H902MPLA	Main Processing   Board	V100R017C00
03025KFE	H903MPLA	Main Processing   Board	V100R019C10

In addition, there are two kind daughter boards CKUA and CKUB of main control boards, the detail comparisons in below chart:

Daughter   Board	Corresponding   Control Board	Function
H901CKUA/H902CKUA	H901MPLA H902MPLA H903MPLA	Implements   clock processing and provides the stratum-3 clock for the system. Implements   the 1588v2 clock processing function. Implements   the 1588ACR clock processing function. (Supported   by V100R016C10 and later).
H901CKUB/H902CKUB	H901MPLA H902MPLA H903MPLA	Implements   clock processing and provides the stratum-3 clock for the system. Implements   the 1588v2 clock processing function.

If you have any pending issues about MPLA after reading this article, please email us at [email protected]