EXHIBIT A AGREEMENT OF REPORTING PERSONS Each of the undersigned hereby agrees that Amendment No. 1 to Schedule 13G filed on the date hereof with respect to the shares of Common Stock of Avici Systems Inc. has been filed on behalf of the undersigned....

Cusip No. 00000X000               13G                        Page 16 of 21 pages


                                    EXHIBIT A

AGREEMENT OF REPORTING PERSONS

      Each of the undersigned hereby agrees that Amendment No. 1 to Schedule 13G
filed on the date hereof with respect to the shares of Common Stock of Avici
Systems Inc. has been filed on behalf of the undersigned.


SIGNATURE:

         Dated: February 14, 2002

         Entities:

Oak Investment Partners VII, Limited Partnership
Oak Associates VII, LLC
Oak VII Affiliates Fund, Limited Partnership
Oak VII Affiliates, LLC
Oak Management Corporation


                                            By: /s/ Xxxxxx X. Xxxxxxxxxx
                                                --------------------------------
                                                     Xxxxxx X. Xxxxxxxxxx, as
                                                     General Partner or
                                                     Managing Member or as
                                                     Attorney-in-fact for the
                                                     above-listed entities


Individuals:

Bandel X. Xxxxxx
Xxxxxx X. Xxxxxxxxx
Xxxxxx X. Xxxxxxxxxx
Xxxxxxx X. Xxxxxx
Xxx X. Xxxxxx


                                            By: /s/ Xxxxxx X. Xxxxxxxxxx
                                                --------------------------------
                                                     Xxxxxx X. Xxxxxxxxxx,
                                                     Individually and as
                                                     Attorney-in-fact for the
                                                     above-listed individuals