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Direct Connect

Overview

Limits

Before using Direct Connect, you need to understand the following limits.

Quota limits

The table below describes the default quotas for resources related to Direct Connect (DC) on the Volcano Engine platform. If the default quota of adjustable items does not meet your needs, you can go to VolcanoEngine Quota Center to increase the corresponding quota. For specific actions, see Quota management.

Topic	Quota parameter	Description	Default quota	Increaseable	Adjustable quota limit
DC Connection	directconnect	The number of DC Connections that you can create under a single account in a single region.	4	Increasable	50
DC Gateway	directconnectgateway	The number of DC Gateways that you can create under a single account in a single region.	10	Increasable	20
DC Gateway		-	The number of Cloud Enterprise Networks (CENs) that you can mount for a single DC Gateway. tip Whether loading to a CEN under the same account or to a CEN under another account via cross-account authorization, you can load a single DC Gateway to only one CEN.	1	No	-
Virtual Interface	directconnect/virtual_interface	The number of DC virtual interfaces that you can associate with a single DC Connection.	5	Self-service upgrade is currently not supported. If needed, please contact your account manager.	-
Virtual Interface		directconnectgateway/virtual_interface	The number of DC virtual interfaces that you can associate with a single DC Gateway.	8	Increasable	16
Route entry	directconnectgateway/static_route	The number of custom static route entries that a single DC Gateway can send to the on-premises data center.	50 entries	Self-service upgrade is currently not supported. If needed, please contact your account manager.	-
		directconnectgateway/bgp/bgp_route	The number of BGP route entries that a single BGP session can receive from the on-premises data center.	100	Increasable	200
		directconnectgateway/tr_route	The number of route entries that a single DC Gateway can receive from the CEN, TR, or Edge Interconnect (EIC).	100	Increasable	1,000
QoS policy	directconnect_qos	The number of QoS policies that you can create under a single account in a single region.	10	Increasable	20
		-	The number of advanced flow queues that you can add to a single QoS policy.	1	No	-
		-	The number of standard flow queues that you can add to a single QoS policy.	2	Increasable	4
		directconnect_qos/rule	The number of flow classification rules that you can add under a single traffic queue.	5	Increasable	10
Health check	directconnect_healthcheck	The number of health check instances that you can create under a single account in a single region.	1	Increasable	2
Health check		directconnect_healthcheck/probe	The number of probes that you can add to a single health check instance.	4	Increasable	10
Failure drill	-	The number of failure drill tasks that you can create under a single account in a single region.	20	Increasable	-
Failure drill		-	The number of drill objects that you can add to a single drill task.	16	Increasable	-

Direct Connect connection limits

Before establishing a DC Connection, you need to plan the overall network between the data center and the VPC to avoid subnet overlap.

Do not use 100.64.0.0/10 for the data center. This subnet is occupied by cloud services in the VPC.

VolcanoEngine only provides free optical modules of 1 Gbps and 10 Gbps with a data transmission distance of 10 kilometers. If you need to use optical modules with the following specifications, you must prepare them yourself.

Optical modules of 1 Gbps and 10 Gbps with data transmission distances over 10 kilometers.

Optical modules of 40 Gbps, 100 Gbps, and 400 Gbps.

Route entry limits

Each Direct Connect Gateway supports up to 50 static route entries by default. Configuring more than 50 static route entries will fail.

The system does not accept default routes (0.0.0.0/0) published from the data center, including both static and BGP routes.

Each DC Gateway can have up to 8 BGP Peers by default and learn up to 100 BGP routes from each Peer. Excess BGP routes will be discarded.

You cannot configure the following IPv4 subnet routes:

127.0.0.0/8, 224.0.0.0/4, 240.0.0.0/4, and 255.255.255.255.

You cannot configure the following IPv6 subnet routes:

Within subnets of ::1/128, FF00::/8, and FE80::/10.

Equivalent to the FE80::/9 subnet.

IP limits

When using DC Connections to enable network interconnection between your data center and VPC, avoid using 100.96.0.32-100.96.0.39 as destination IP addresses. Otherwise, the network may become unreachable.

Redundancy limits

Direct Connect redundancy supports two redundancy modes: active-standby and load-balancing. Choose the mode that fits your business scenario.

For redundancy scenarios, we recommend connecting different DC Connections to different switches to improve business disaster recovery.

VolcanoEngine only guarantees service availability for multiple DC Connections to different access points. For multiple DC Connections to the same access point and a single DC Connection to the same access point, VolcanoEngine will not guarantee service availability. For details, see the service availability commitment of Direct Connect Service Level Agreement.

Construction limits

Before visiting the VolcanoEngine access point data center, the construction party needs to download the approved Letter of Authorization (LOA) in advance. This document is required for construction within the VolcanoEngine data center.

The construction party must strictly adhere to the approved time slot specified in the LOA to enter the VolcanoEngine access point data center for construction. Otherwise, entry will be denied.

Only pre-authorized engineers listed in the approved LOA can enter the VolcanoEngine access point data center for construction. Unregistered personnel will be denied entry without exception.

When entering the VolcanoEngine access point data center for construction, adhere to the regulations introduced by the data center operator and VolcanoEngine engineers to ensure smooth completion of the work.

Other limits

The maximum acceptable AS-Path length for Direct Connect is 30.

Last updated: 2026.08.24 11:30:44