This article explains why the following errors may occur on MX Series 3D Universal Edge Routers:
too many classifiers of type xxx,33
too many classifiers of type xxx,49
too many rewrites of type xxx, 33
On MX routers with JUNOS 15.1 or higher, the following errors may appear when executing commit or commit check:
user@MX1# commit check error: cos_config: too many classifiers of type IEEE 802.1ad, 33 error: configuration check-out failed user@MX2# commit check error: cos_config: too many classifiers of type IEEE 802.1ad, 49 error: configuration check-out failed user@MX1# commit check error: cos_config: too many rewrites of type IEEE 802.1ad, 33 error: configuration check-out failed
In this case, the classifiers/rewrites-rules number under [class-of-service] hierarchy is over the limitation. However, in other cases, the errors may appear even when the classifiers or rewrites-rules are more than 32.
The commit check at this point performs only while Enhanced Subscriber-Management is enabled on the MX router, known as [system services subscriber-management enable] statement exists.
Since the enhanced subscriber management is introduced in Junos 15.1R3, a user will not encounter this error on Junos releases earlier than 15.1R3. Release 15.1R3 or later without subscriber-management enabled, class-of-service classifiers and rewrite-rules have no such limitations as well.
The following releases are improved to increase classifiers per type limitation from 32 to 48:
Users who expect to use classifiers more than 32 should upgrade Junos to a release as above.
The real limitation of classifiers, rewrites-rules without subscriber-management is hardware related. Refer to the specific hardware scaling document.