The following sections describe quotas and limits for Cloud Router. To change a quota, go to the Google Cloud Console to request additional quota.
This table covers important quotas per project. For other quotas, see the Cloud Console Quotas page.
|Cloud Routers per project||Quota||Regardless of quota, each network is limited to five Cloud Routers per region. See Limits.|
The following limits for Cloud Router apply to Virtual Private Cloud (VPC) networks. Unless otherwise stated, these limits cannot be increased.
|Maximum number of Cloud Routers per combination of VPC network and region||5||If you have sufficient project quota, you can create up to five Cloud Routers in a given VPC network and region.|
|Maximum number of BGP peers for each Cloud Router in a given VPC network and region||128||The BGP peer can be a Cloud VPN tunnel using dynamic routing or a VLAN attachment for Dedicated Interconnect or Partner Interconnect.|
|For a given Cloud Router, maximum number of subnet route advertisements per BGP session||No restriction||Cloud Routers do not have a limit for the number of subnet routes they can advertise. The number of subnet routes are determined by the number of subnets, which are controlled by VPC network quotas and limits.|
|For a given Cloud Router, maximum number of custom route advertisements per BGP session||200||If the custom route advertisements are identical for all BGP sessions on a Cloud Router, this limit represents the total number of unique custom route advertisements for the Cloud Router. In this case, each session receives the same set of custom route advertisements.|
|Maximum number of unique destinations for learned routes that can be applied to subnets in a given region by all Cloud Routers in the same region||100||
For both limits on the maximum number of unique destinations for learned routes:
Routes are grouped by unique destinations. Routes with identical destinations but different next hops only count as a single destination. Routes with identical destinations and identical next hops also only count as a single destination.
For networks in global dynamic routing mode, it is possible to reach one of the maximum number of unique destination limits without reaching the other. When either of the limits has been reached, you can experience intermittent connectivity issues when the routes are dropped. For details, see the learned route example.
For more information about these limits, including metrics that you can use to understand your current limits and usage, see Check quotas and limits in Troubleshooting.
If you need to increase either of these limits, contact your Google Cloud sales team.
Only applicable to VPC networks in global dynamic routing mode:
Maximum number of unique destinations for learned routes that can be applied to subnets in a given region by Cloud Routers from different regions
Learned route example
The following examples illustrate the route dropping behavior that you can encounter when the regional or global limit is exceeded.
Suppose you have Cloud Routers in the
us-east1 region and
Cloud Routers in the
us-west1 region in the same VPC network, and
global dynamic routing is enabled. The Cloud Routers in each region
learn a set of routes for 100 unique destinations. For the purpose of this
example, the Cloud Routers in each region don’t learn any of the same
Regardless of which Cloud Routers learn the routes within each region, each region’s regional limit is exhausted because 100 of 100 unique destinations are learned by the Cloud Routers in each region. The global limits for both regions are exhausted because the Cloud Routers in each region import 100 unique destinations from the Cloud Routers in the other region. If the example VPC network used regional dynamic routing, the global limits in each region would not apply because the regional dynamic routing mode does not propagate learned custom dynamic routes from one region to another.
Exceeding a region’s regional limit
Suppose your on-premises router that's connected to a Cloud Router in
us-west1 advertises a new route with a 101 destination. Cloud Routers in
us-west1 region pick the routes for 100 of the 101 unique destinations
following a deterministic order. The routes that use these selected (100 unique)
destinations are made available to resources in the
us-west1 region. Those
same routes are made available to other regions, subject to each other region’s
Exceeding a region’s global limit
When 101 unique destinations are learned by Cloud Routers in the
us-west1 region, routes for 100 of those 101 unique destinations from
are made available to resources in the
us-east1 region, because the
region’s global limit can only accept 100 unique destinations.
Suppose that you create a Cloud Router in a third region,
the same VPC network. Suppose that the new Cloud Router learns 10 unique
destinations from its BGP peer. Although the
us-central1 region’s regional
destination limit has not been exceeded, the
us-central1 region’s global
unique destination limit has been exceeded because a total of 200 unique
destinations are provided by the other two regions (100 from
us-east1 and a
different 100 from
us-west1). In each region, the deterministic route order
selects routes for no more than 100 unique destinations from other regions, as
indicated in the following table.
Unique destinations local to the region
(usage of region’s regional limit)
Unique destinations from other regions
(usage of region’s global limit)
|us-west1||101 received. 100 of the 101 are considered according to the deterministic route dropping. Only the 100 selected prefixes are advertised to remote regions.||
110 received (100 from
|us-east1||100 received. All 100 are considered and advertised to remote regions.||
110 received (100 from
|us-central1||10 received. All 10 are considered.||
200 received (100 from
us-central1 region’s global limit is exceeded, its regional quota can accept routes whose next hops are in the
Deterministic route dropping behavior
Cloud Router implements a deterministic route dropping behavior so that, as long as the same prefixes are received in each region, a consistent set of routes are made available to resources within that region. This consistency is preserved when Cloud Router tasks restart. If a limit is exceeded, Cloud Router drops prefixes according to a predictable algorithm regardless of when the routes were learned or the MED values of these routes.
As shown in exceeding a region’s global limit, the deterministic dropping behavior is applied independently to each region’s regional limit and each region’s global limit. The set of 100 unique prefixes that are not dropped in each region due to reaching each region’s global limit (the last column) is not guaranteed to be the same.
Avoiding route dropping
During route dropping, you lose connectivity for the prefixes that are dropped. To avoid route dropping, monitor each region’s regional and global prefix usage by using Cloud Monitoring or Cloud Logging, and make sure not to advertise more unique destinations than each limit.
Consider aggregating prefixes (for example, by aggregating prefixes into a prefix of smaller length) to reduce the number of unique destinations. If aggregating prefixes isn’t possible, contact your Google Cloud Sales team to discuss alternative options.
Cloud Router enforces quotas on resource usage for various reasons. For example, quotas protect the community of Google Cloud users by preventing unforeseen spikes in usage. Quotas also help users who are exploring Google Cloud with the free tier to stay within their trial.
All projects start with the same quotas, which you can change by requesting additional quota. Some quotas may increase automatically based on your use of a product.
To view quotas or request quota increases, Identity and Access Management (IAM) members need one of the following roles.
|Check quotas for a project||One of the following:|
|Modify quotas, request additional quota||One of the following:|
Checking your quota
- In the Cloud Console, go to the Quotas page.
- To search for the quota that you want to update, use the Filter table. If you don't know the name of the quota, use the links on this page instead.
gcloud command-line tool, run the following command to
check your quotas. Replace
PROJECT_ID with your own project ID.
gcloud compute project-info describe --project PROJECT_ID
To check your used quota in a region, run the following command:
gcloud compute regions describe example-region
Errors when exceeding your quota
If you exceed a quota with a
gcloud outputs a
quota exceeded error
message and returns with the exit code
If you exceed a quota with an API request, Google Cloud returns the
following HTTP status code:
HTTP 413 Request Entity Too Large.
Requesting additional quota
Request additional quota from the Quotas page in the Cloud Console. Quota requests take 24 to 48 hours to process.
- In the Cloud Console, go to the Quotas page.
- On the Quotas page, select the quotas that you want to change.
- At the top of the page, click Edit quotas.
- Fill out your name, email, and phone number, and then click Next.
- Fill in your quota request, and then click Done.
- Submit your request.
Each quota represents a maximum number for a particular type of resource that you can create, if that resource is available. It's important to note that quotas do not guarantee resource availability. Even if you have available quota, you can't create a new resource if it is not available.
For example, you might have sufficient quota to create a new regional, external IP address
us-central1 region. However, that is not possible if there are no
available external IP addresses in that region. Zonal resource
availability can also affect your ability to create a new resource.
Situations where resources are unavailable in an entire region are rare. However, resources within a zone can be depleted from time to time, typically without impact to the service level agreement (SLA) for the type of resource. For more information, review the relevant SLA for the resource.