Cisco BNG deployment guide (PPP, IPoE)

https://blog.ine.com/2009/07/22/understanding-dhcp-option-82

https://www.alcatron.net/Cisco%20Live%202013%20Melbourne/Cisco%20Live%20Content/Service%20Provider/BRKSPG-2303%20%20Residential%20Broadband%20Subscriber%20Aggregation%20and%20BNG%20Deployment%20Models.pdf

https://supportforums.cisco.com/t5/service-providers-documents/asr9000-xr-bng-deployment-guide/ta-p/3110436#DHCPIP_sessions

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r6-1/bng/configuration/guide/b-bng-cg-asr9k-61x/b-bng-cg-asr9k-61x_chapter_0101.pdf

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-s/dhcp-15-s-book/dhcp-option-82.html

https://supportforums.cisco.com/document/12516486/asr9k-bng-radius-and-coa-deployment-guide
https://supportforums.cisco.com/document/94171/asr9000xr-bng-deployment-guide
https://supportforums.cisco.com/t5/tkb/articleprintpage/tkb-id/4441-docs-service-providers/article-id/1985
https://supportforums.cisco.com/t5/xr-os-and-platforms/asr-9k-bng-dhcp-triggered-session-start-ack-not-received-by/td-p/2641468
https://supportforums.cisco.com/t5/service-providers-documents/asr9000-xr-bng-deployment-guide/ta-p/3110436#DHCPIP_sessions
https://supportforums.cisco.com/t5/service-providers-documents/asr9000-xr-bng-vsa-s-vendor-specific-attributes-and-services/ta-p/3141601
https://supportforums.cisco.com/t5/service-providers-documents/asr9000-bng-training-guide-setting-up-pppoe-and-ipoe-sessions/ta-p/3124670

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iwag/configuration/xe-3s/IWAG_Config_Guide_BookMap/dhcp-option-82-remote-id-format.pdf