EXHIBIT 23.1

CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in this Annual Report (Form 10-K)
of Juniper Networks, Inc. of our report dated January 14, 2003 included in the
2002 Annual Report to Stockholders of Juniper Networks, Inc.

Our audits also included the financial statement schedule of Juniper Networks,
Inc. listed in Item 15(a). This schedule is the responsibility of the Company's
management. Our responsibility is to express an opinion based on our audits. In
our opinion, the financial statement schedule referred to above, when considered
in relation to the basic financial statements taken as a whole, presents fairly
in all material respects the information set forth therein.

We consent to the incorporation by reference in the following registration
statements of Juniper Networks, Inc. of our report dated January 14, 2003 with
respect to the consolidated financial statements incorporated by reference and
our report included in the preceding paragraph with respect to the financial
statement schedule included in the Annual Report (Form 10-K) for the year ended
December 31, 2002:

Registration Statement
Form Number Number Description
----------- ----------------------- -----------

Form S-8 333-92086 Juniper Networks, Inc. 2000 Non-Statutory Stock Option Plan

Form S-8 333-92088 Juniper Networks, Inc. 1999 Employee Stock Purchase Plan

Form S-8 333-92090 Unisphere Networks, Inc. Second Amended and Restated 1999 Stock
Incentive Plan

Form S-8 333-85387 Juniper Networks, Inc. Amended and Restated 1996 Stock Plan;
Juniper Networks, Inc. 1999 Employee Stock Purchase Plan

Form S-8 333-32412 Juniper Networks, Inc. Amended and Restated 1996 Plan; Layer 5 1999
Stock Incentive Plan

Form S-8 333-44148 Juniper Networks, Inc. 2000 Nonstatutory Stock Option Plan

Form S-8 333-52258 Micro Magic 1995 Stock Option Plan; Micro Magic 2000 Stock Option
Plan

Form S-8 333-57860 Juniper Networks, Inc. Amended and Restated 1996 Stock Plan

Form S-8 333-57862 Juniper Networks, Inc. 2000 Nonstatutory Stock Option Plan

Form S-8 333-57864 Juniper Networks, Inc. 1999 Employee Stock Purchase Plan

Form S-8 333-75770 Pacific Broadband Communications, Inc. 2000 Stock Incentive Plan;
Pacific Broadband Communications, Inc. 2000 Sub-Plan

Form S-3 333-44116 Equity Securities

Form S-3 333-52260 Equity Securities

Form S-3 333-75758 Equity Securities

/s/ Ernst & Young LLP

San Francisco, California
March 10, 2003