# [PFE_COS_B2_ONE_CLASS](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS)

## SYSLOG Details
- **Message**: COSMAN: classifier <variable>classifier-id-new</variable> for ifl <variable>index</variable> replaces classifer <variable>classifier-id-old</variable> still used
- **Help**: B2 only supports one classifier at a time.
- **Description**: Only one classifier can be active on a B2-based FPC at any given time.
- **Type**: Error: An error occurred
- **Severity**: error
- **Cause**: -
- **Action**: -
- **Attributes**: classifier-id-new
index
classifier-id-old
- **Facility**: LOG_PFE

## Found this message in the following releases:
- [Junos OS 26.2R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=26.2R1)
- [Junos OS 25.4R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=25.4R1)
- [Junos OS 25.2R2](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=25.2R2)
- [Junos OS 25.2R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=25.2R1)
- [Junos OS 24.4R2](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=24.4R2)
- [Junos OS 24.4R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=24.4R1)
- [Junos OS 24.2R2](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=24.2R2)
- [Junos OS 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R2](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=23.4R2)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=23.4R1)
- [Junos OS 23.2R2](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=23.2R2)
- [Junos OS 23.2R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=23.2R1)
- [Junos OS 22.4R3](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=22.4R3)
- [Junos OS 22.4R2](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=22.4R2)
- [Junos OS 22.4R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=22.4R1)
- [Junos OS 22.2R3](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=22.2R3)
- [Junos OS 22.2R2](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=22.2R2)
- [Junos OS 22.2R1](https://apps.juniper.net/syslog-explorer/?msg=PFE_COS_B2_ONE_CLASS&sw=Junos%20OS&rel=22.2R1)