# US 12,015,539 B2 · Mitigating oversubscription of traffic to edge nodes in a data center > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,539 B2 - Document ID: US12015539B2 - Status: Granted - Kind: B2 - Application number: 17/726,453 - Filed: 2022-04-21 - Published: 2023-10-26 - Granted: 2024-06-18 - Earliest claimed: 2022-04-21 - Assignees: VMware, Inc. - Applicants: VMware, Inc. - Inventors: Ankit Parmar; Harish Kumar Gaviyappa; Pawan Shukla; Ravi Parikh; Ritesh Tiwari - Web page: https://patentgrep.com/patent/US12015539B2 ## CPC - H04L 45/02: Topology update or discovery - H04L 45/123: {Evaluation of link metrics (techniques for monitoring network metrics H04L43/08)} - H04L 45/38: {Flow based routing} - H04L 45/42: Centralised routing - H04L 47/122: by diverting traffic away from congested entities - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract An example method of mitigating oversubscription of traffic to edge services gateways in a data center includes: receiving, by a host of the data center, traffic metrics corresponding to the ESGs; determining traffic congestion at a first active edge of the ESGs in response to the traffic metrics; dividing, in response to the traffic congestion, a classless inter-domain routing (CIDR) block assigned to the first active edge into a first CIDR block and a second CIDR block; and creating, in a routing table of a router, a first route between an internet protocol (IP) address of the first active edge and the first CIDR block, and a second route between an IP address of a second active edge of the ESGs and the second CIDR block. ## Claims ### Claim 1 A method of mitigating oversubscription of traffic to edge services gateways (ESGs) in a data center, a router in the data center including a first route between an internet protocol (IP) address of a first active edge of the ESGs and a first classless inter domain routing (CIDR) block assigned to the first active edge and a second route between an IP address of a second active edge of the ESGs and a second CIDR block assigned to the second active edge, the method comprising: receiving, by a host of the data center, traffic metrics corresponding to the ESGs; determining traffic congestion at the first active edge of the ESGs in response to the traffic metrics; dividing, in response to the traffic congestion, the first CIDR block into a first CIDR sub-block and a second CIDR sub-block; modifying, in a routing table of the router, the first route to be between the IP address of the first active edge and the first CIDR sub-block; creating, in the routing table of the router, a third route between an IP address of the second active edge of the ESGs and the second CIDR sub-block; and creating, in the routing table of the router, a fourth route between the IP address of the second active edge and a third CIDR block, the third CIDR block being an aggregation of CIDR blocks of a plurality of under-utilized routes. ### Claim 2 (depends on 1) The method of claim 1, wherein the host executes a standby edge of the ESGs. ### Claim 3 (depends on 1) The method of claim 1, wherein the host is configured to determine the traffic congestion by requesting the traffic metrics from a control plane of a cloud in which the data center is provisioned. ### Claim 4 (depends on 3) The method of claim 3, wherein the router comprises an underlay router in a physical network of the cloud. ### Claim 5 (depends on 1) The method of claim 1, further comprising: determining the second active edge of the ESGs to be under-utilized based on the traffic metrics. ### Claim 6 (depends on 1) The method of claim 1, further comprising: determining the plurality of under-utilized routes in the routing table of the router; aggregating the CIDR blocks of the plurality of under-utilized routes into the third CIDR block; and removing the plurality of under-utilized routes from the routing table. ### Claim 7 (depends on 6) The method of claim 6, wherein the host is configured to determine the plurality of under-utilized routes in the routing table in response to the traffic metrics and tags on the plurality of under-utilized routes. ### Claim 8 A non-transitory computer readable medium comprising instructions to be executed in a computing device to cause the computing device to carry out a method of mitigating oversubscription of traffic to edge services gateways (ESGs) in a data center, a router in the data center including a first route between an internet protocol (IP) address of the first active edge of the ESGs and a first classless inter domain routing (CIDR) block assigned to the first active edge and a second route between an IP address of the second active edge of the ESGs and a second CIDR block assigned to the second active edge, the method comprising: receiving, by a host of the data center, traffic metrics corresponding to the ESGs; determining traffic congestion at the first active edge of the ESGs in response to the traffic metrics; dividing, in response to the traffic congestion, the first CIDR block into a first CIDR sub-block and a second CIDR sub-block; modifying, in a routing table of the router, the first route to be between the IP address of the first active edge and the first CIDR sub-block; creating, in the routing table of the router, a third route between an IP address of the second active edge of the ESGs and the second CIDR sub-block; and creating, in the routing table of the router, a fourth route between the IP address of the second active edge and a third CIDR block, the third CIDR block being an aggregation of CIDR blocks of a plurality of under-utilized routes. ### Claim 9 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the host executes a standby edge of the ESGs. ### Claim 10 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the host is configured to determine the traffic congestion by requesting the traffic metrics from a control plane of a cloud in which the data center is provisioned. ### Claim 11 (depends on 10) The non-transitory computer readable medium of claim 10, wherein the router comprises an underlay router in a physical network of the cloud. ### Claim 12 (depends on 8) The non-transitory computer readable medium of claim 8, further comprising: determining the second active edge of the ESGs to be under-utilized based on the traffic metrics. ### Claim 13 (depends on 8) The non-transitory computer readable medium of claim 8, further comprising: determining the plurality of under-utilized routes in the routing table of the router; aggregating the CIDR blocks of the plurality of under-utilized routes into the third CIDR block; and removing the plurality of under-utilized routes from the routing table. ### Claim 14 (depends on 13) The non-transitory computer readable medium of claim 13, wherein the host is configured to determine the plurality of under-utilized routes in the routing table in response to the traffic metrics and tags on the plurality of under-utilized routes. ### Claim 15 A computing system, comprising: edge services gateways (ESGs) of a data center including a first active edge and a second active edge; a router including a first route between an internet protocol (IP) address of the first active edge and a first classless inter domain routing (CIDR) block assigned to the first active edge, and a second route between an IP address of the second active edge and a second CIDR block assigned to the second active edge; a host in the data center having a hardware platform; and the host configured to: receive traffic metrics corresponding to the ESGs; determine traffic congestion at the first active edge of the ESGs in response to the traffic metrics; divide, in response to the traffic congestion, the first CIDR block into a first CIDR sub-block and a second CIDR sub-block; modify, in a routing table of the router, the first route to be between the IP address of the first active edge and the first CIDR sub-block; create, in the routing table of the router, a second route between the IP address of a second active edge of the ESGs and the second CIDR sub-block; create, in the routing table of the router, a fourth route between the IP address of the second active edge and a third CIDR block, the third CIDR block being an aggregation of CIDR blocks of a plurality of under-utilized routes. ### Claim 16 (depends on 15) The computing system of claim 15, wherein the host executes a standby edge of the ESGs. ### Claim 17 (depends on 15) The computing system of claim 15, wherein the host is configured to determine the traffic congestion by requesting the traffic metrics from a control plane of a cloud in which the data center is provisioned. ### Claim 18 (depends on 17) The computing system of claim 17, wherein the router comprises an underlay router in a physical network of the cloud. ### Claim 19 (depends on 15) The computing system of claim 15, wherein the host is configured to: determine the second active edge of the ESGs to be under-utilized based on the traffic metrics. ### Claim 20 (depends on 15) The computing system of claim 15, wherein the host is configured to: determine the plurality of under-utilized routes in the routing table of the router; aggregate the CIDR blocks of the plurality of under-utilized routes into the third CIDR block; and remove the plurality of under-utilized routes from the routing table.