ifAlias empty on FreeBSD

Hi,

I use net-snmp on a FreeBSD router and all is working fine except that
the descriptions of the interfaces are not filled as ifAlias.

alarig@conan ~ $ snmpwalk -v2c -c public nominoe.grif ifName.16
IF-MIB::ifName.16 = STRING: em1.102
alarig@conan ~ $ snmpwalk -v2c -c public nominoe.grif ifAlias.16
IF-MIB::ifAlias.16 = STRING:

alarig@nominoe:~ % ifconfig em1.102 | grep description
        description: Livraison BGP AS112

My daemon is configured like this:
alarig@nominoe:~ % grep -Ev '^#|^$' /usr/local/etc/snmpd.conf
proc  bird
proc  bird6
proc  unbound
proc  ntpd
disk  /
load  12 12 12
syslocation  FR
syscontact  [email protected]
sysservices 78
trapsink  gurvant.grifon.fr
trap2sink  gurvant.grifon.fr
informsink  gurvant.grifon.fr
trapcommunity  auth
authtrapenable  1
rocommunity  public 127.0.0.1
rocommunity  public 172.17.0.0/24

What should I do to make it work?

Thanks,
-- 
alarig

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