[CentOS] Yum Skipping filter question

[John Doe]

From: Majian <jiannma at gmail.com>
>When I  run "yum update" command in my laptop , it displayed this :
>root at foo Desktop]# yum update
>Loaded plugins: aliases, changelog, fastestmirror, filter-data, keys, kmod, list-data, priorities, protect-
>>              : packages, protectbase, security, tmprepo, verify
>Loading mirror speeds from cached hostfile
> * addons: mirrors.163.com
> * base: mirrors.163.com
>> * extras: mirrors.163.com
> * rpmforge: ftp-stud.fht-esslingen.de
> * updates: mirrors.163.com
>>Skipping filters plugin, no data
>0 packages excluded due to repository protections
>Skipping security plugin, no data
>Setting up Update Process
>No Packages marked for Update
>I  searched on the Internet some time , but had not any useful answer . 

Since you did not use a filtering option, the plugin is "ignored"...
One example from the man page gives:
"Limiting package lists to filtered ones"

JD