# [RPD_MIRROR_DATA_TLV](https://apps.juniper.net/syslog-explorer/?msg=RPD_MIRROR_DATA_TLV)

## SYSLOG Details
- **Message**: Mirror: <variable>error-message</variable>
- **Help**: The mirror system has received an unknown mirror data TLV message
- **Description**: The indicated error occurred when the routing protocol process (rpd) has established the nonstop routing mirror connection between the master and standby Routing Engines between different versions of the JUNOS software. The older JUNOS software version is not able to parse the received mirror data TLV and therefore ignores the TLV.
- **Type**: Internal: Internal log message
- **Severity**: warning
- **Cause**: The master and standby Routing Engines are running different versions of the JUNOS software.
- **Action**: -
- **Attributes**: error-message
- **Facility**: LOG_DAEMON

## Found this message in the following releases:
- [Junos OS 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=RPD_MIRROR_DATA_TLV&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=RPD_MIRROR_DATA_TLV&sw=Junos%20OS&rel=23.4R1)