US 12,088,552 B2
Synchronizing dynamic host configuration protocol snoop information
Ali Sajassi, Alamo, CA (US); Samir Thoria, Saratoga, CA (US); Lukas Krattiger, Pleasanton, CA (US); and Manoj Kumar Pandey, San Ramon, CA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Feb. 21, 2023, as Appl. No. 18/172,225.
Application 18/172,225 is a continuation of application No. 17/686,797, filed on Mar. 4, 2022, granted, now 11,606,333.
Prior Publication US 2023/0283589 A1, Sep. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 61/5053 (2022.01); H04L 9/40 (2022.01); H04L 61/5014 (2022.01); H04L 101/622 (2022.01)
CPC H04L 61/5053 (2022.05) [H04L 61/5014 (2022.05); H04L 63/0236 (2013.01); H04L 63/101 (2013.01); H04L 2101/622 (2022.05)] 17 Claims
OG exemplary drawing
 
1. A method comprising:
performing, by a first provider edge (PE) device from a plurality of PE devices, dynamic host configuration protocol (DHCP) snooping of a first plurality of DHCP messages between a DHCP client and a DHCP server, wherein the DHCP snooping comprises:
receiving, by the first PE device, a DHCP offer message broadcasted by the DHCP server to the plurality of PE devices, wherein the DHCP offer message is directed to the DHCP client;
determining, by the first PE device, that the DHCP offer message corresponds to a DHCP discover message forwarded by the first PE device from the DHCP client to the DHCP server; and
sending, by the first PE device, the DHCP offer message to the DHCP client;
determining, based on the snooping of the first plurality of DHCP messages, that the DHCP client is secure;
sending, by the first PE device to at least one other PE device, a first route advertisement that includes an indication; and
configuring the at least one other PC device to validate network traffic associated with the DHCP client based on the indication.