The value of tmnxOamSysPerfOprLimitTx indicates this node's upper bound
on the total echo request packet transmission rate. Echo reply packets
are not affected by this limit.
The upper bound applies to echo request packets sent by the following
test types:
1. SDP keep-alive.
2. Static route CPE check.
3. Filter redirect policy ping test.
4. VRRP policy host unreachable ping test.
5. Any OAM or SAA test configured using TIMETRA-OAM-TEST-MIB.