LDAP Request from zimbra admin store

[vdagost-fr]

Hello,

Do you know why Zimbra store request external LDAP with this kind of request

Oct 26 14:15:57 LXLYODEV30 slapd[26918]: conn=1001 op=0 SRCH base="" scope=0 deref=0 filter="(objectClass=*)"
Oct 26 14:15:57 LXLYODEV30 slapd[26918]: conn=1001 op=0 SRCH attr=1.1
Oct 26 14:15:57 LXLYODEV30 slapd[26918]: conn=1001 op=0 SEARCH RESULT tag=101 err=0 nentries=1 text=

What is attr=1.1 ?

Regards
Victor