enterprise-router/umn/source/service_overview/notes_and_constraints.rst
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:original_name: er_01_0006.html
.. _er_01_0006:
Notes and Constraints
=====================
Specifications
--------------
:ref:`Table 1 <er_01_0006__table591864733813>` lists the specifications of the enterprise router.
.. _er_01_0006__table591864733813:
.. table:: **Table 1** Enterprise router specifications
+--------------------------------------------------------------------------+-----------------+---------------------------+
| Item | Default Setting | Adjustable |
+==========================================================================+=================+===========================+
| Maximum number of enterprise routers that can be created by each account | 1 | Contact customer service. |
+--------------------------------------------------------------------------+-----------------+---------------------------+
| Maximum forwarding capability supported by each enterprise router | 100 Gbit/s | Contact customer service. |
+--------------------------------------------------------------------------+-----------------+---------------------------+
Constraints
-----------
- Enterprise routers cannot be used together with virtual IP addresses of VPCs. If virtual IP addresses are used, contact customer service.
- Traffic cannot be forwarded from a VPC to the enterprise router that it attached to if you set the destination of a route whose next hop is the enterprise router to 0.0.0.0/0 in the VPC route table and if:
- An ECS in the VPC has an EIP bound.
- The VPC is being used by ELB, NAT Gateway, VPC Endpoint, or Distributed Cache Service (DCS).
To solve this problem, refer to :ref:`Why Traffic Can't Be Forwarded from a VPC with a Route Destination of 0.0.0.0/0 to Its Enterprise Router? <er_01_0121>`
- The VPC route table does not allow you to add a route whose destination address is 100.64.x.x and next hop is an enterprise router.
To solve this problem, refer to :ref:`How Do I Route Traffic to 100.64.x.x Through an Enterprise Router? <er_01_0122>`