DHCPv4 Relay Agent High Level Design - #1938
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Signed-off-by: Ashutosh Agrawal <ashu@cisco.com>
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yaqiangz
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Hi @lolyu could you please help to check the dual tor part? |
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Hi @yaqiangz , @saiarcot895 , @lguohan , could you please create the new repo mentioned in this HLD( https://github.com/sonic-net/sonic-dhcpv4-relay) to open code PR? |
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Maybe detailing the type of OFFER packet(unicast) is more friendly
gordon-nexthop
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Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). What I did Added dependency checks in SONiC config CLI to prevent deletion of interfaces, VRFs, and VLANs that are in use by DHCPv4 relay configurations. Added/updated unit tests. How I did it Implemented a new function check_dhcpv4_relay_dependencies to check if an interface or VRF is referenced in the DHCPV4_RELAY table. Called this function before allowing deletion of portchannels, loopbacks, VRFs, and VLANs. Modified the VLAN deletion logic to block removal if the VLAN is present in the DHCPV4_RELAY table. Extended the test suite to verify that deletion is blocked when dependencies exist and allowed after cleanup. How to verify it Run the updated unit tests: they now include cases where deletion of interfaces, VRFs, or VLANs in use by DHCPv4 relay is attempted and should fail. Manually test by configuring DHCPv4 relay on an interface/VRF/VLAN, then attempt to delete it using the CLI; the command should fail with an appropriate error message. After removing the DHCPv4 relay configuration, deletion should succeed.
ashutosh-agrawal
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). Docker changes PR : sonic-net#22486 How I did it Included new commands to support dhcpv4_relay in dockers/docker-dhcp-relay folder. Corresponding cli-plugin-tests are included. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Co-authored-by: Prashant Srivastava <srivastavaprashant829@gmail.com>
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). Docker changes PR : sonic-net#22486 How I did it Included new commands to support dhcpv4_relay in dockers/docker-dhcp-relay folder. Corresponding cli-plugin-tests are included. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Co-authored-by: Prashant Srivastava <srivastavaprashant829@gmail.com> Signed-off-by: Feng Pan <fenpan@microsoft.com>
yxieca
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com>
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com>
hdwhdw
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com> Signed-off-by: Dawei Huang <daweihuang@microsoft.com>
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). Docker changes PR : sonic-net#22486 How I did it Included new commands to support dhcpv4_relay in dockers/docker-dhcp-relay folder. Corresponding cli-plugin-tests are included. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Co-authored-by: Prashant Srivastava <srivastavaprashant829@gmail.com> Signed-off-by: xiaweijiang <xiaweijiang@microsoft.com>
xwjiang-ms
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com> Signed-off-by: xiaweijiang <xiaweijiang@microsoft.com>
YairRaviv
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Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). What I did Added dependency checks in SONiC config CLI to prevent deletion of interfaces, VRFs, and VLANs that are in use by DHCPv4 relay configurations. Added/updated unit tests. How I did it Implemented a new function check_dhcpv4_relay_dependencies to check if an interface or VRF is referenced in the DHCPV4_RELAY table. Called this function before allowing deletion of portchannels, loopbacks, VRFs, and VLANs. Modified the VLAN deletion logic to block removal if the VLAN is present in the DHCPV4_RELAY table. Extended the test suite to verify that deletion is blocked when dependencies exist and allowed after cleanup. How to verify it Run the updated unit tests: they now include cases where deletion of interfaces, VRFs, or VLANs in use by DHCPv4 relay is attempted and should fail. Manually test by configuring DHCPv4 relay on an interface/VRF/VLAN, then attempt to delete it using the CLI; the command should fail with an appropriate error message. After removing the DHCPv4 relay configuration, deletion should succeed.
jasonbridges
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com>
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com>
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com> Signed-off-by: Feng Pan <fenpan@microsoft.com>
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* [dhcp_relay] sonic dhcp relay agent for IPv4 (#22486) Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com> * Update sonic-dhcp-relay submodule to include boost dependency fixes Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> --------- Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Anant <127479400+AnantKishorSharma@users.noreply.github.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com> Co-authored-by: Vineet Mittal <46945843+vmittal-msft@users.noreply.github.com>
eddieruan-alibaba
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This document provides a high-level design for SONiC's new DHCPv4 relay agent, which addresses limitations of the existing ISC-DHCP implementation. The document outlines the architecture, new features and configuration of the new design, and also addresses the backward compatibility concerns related to transition from isc-dhcp. Signed-off-by: Eddie Ruan <eddie.ruan@alibaba-inc.com>
mhchann
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). Docker changes PR : sonic-net#22486 How I did it Included new commands to support dhcpv4_relay in dockers/docker-dhcp-relay folder. Corresponding cli-plugin-tests are included. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Co-authored-by: Prashant Srivastava <srivastavaprashant829@gmail.com> Signed-off-by: mhchann <mhchann082@gmail.com>
mhchann
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com> Signed-off-by: mhchann <mhchann082@gmail.com>
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). Docker changes PR : sonic-net#22486 How I did it Included new commands to support dhcpv4_relay in dockers/docker-dhcp-relay folder. Corresponding cli-plugin-tests are included. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Co-authored-by: Prashant Srivastava <srivastavaprashant829@gmail.com>
roger530-ho
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com>
xdqi
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). Docker changes PR : sonic-net#22486 How I did it Included new commands to support dhcpv4_relay in dockers/docker-dhcp-relay folder. Corresponding cli-plugin-tests are included. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Co-authored-by: Prashant Srivastava <srivastavaprashant829@gmail.com>
xdqi
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Why I did it Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938) Work item tracking Microsoft ADO (number only): How I did it Edit supervisord template to start sonic DHCPv4 relay instance when configured to do so in Config DB. Align cfg unit test to the new change. How to verify it Configure sonic DHCPv4 agent as described in the feature HLD(sonic-net/SONiC#1938) Test it with real client/server with IPv4 or use the sonic-mgmt suite Signed-off-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Shivashankar C R <shivashankar.c.r@gmail.com> Co-authored-by: Ashutosh Agrawal <ashu@cisco.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: StormLiangMS <89824293+StormLiangMS@users.noreply.github.com>
Yogapriya-cisco
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Jul 10, 2026
Currently SONiC uses the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks. With this PR we are adding sonic dhcp relay agent for IPv4 as described in this HLD(sonic-net/SONiC#1938). What I did Added dependency checks in SONiC config CLI to prevent deletion of interfaces, VRFs, and VLANs that are in use by DHCPv4 relay configurations. Added/updated unit tests. How I did it Implemented a new function check_dhcpv4_relay_dependencies to check if an interface or VRF is referenced in the DHCPV4_RELAY table. Called this function before allowing deletion of portchannels, loopbacks, VRFs, and VLANs. Modified the VLAN deletion logic to block removal if the VLAN is present in the DHCPV4_RELAY table. Extended the test suite to verify that deletion is blocked when dependencies exist and allowed after cleanup. How to verify it Run the updated unit tests: they now include cases where deletion of interfaces, VRFs, or VLANs in use by DHCPv4 relay is attempted and should fail. Manually test by configuring DHCPv4 relay on an interface/VRF/VLAN, then attempt to delete it using the CLI; the command should fail with an appropriate error message. After removing the DHCPv4 relay configuration, deletion should succeed. Signed-off-by: Yogapriya Mohankumar <ymohanku@cisco.com>
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This document provides a high-level design for SONiC's new DHCPv4 relay agent, which addresses limitations of the existing ISC-DHCP implementation. The document outlines the architecture, new features and configuration of the new design, and also addresses the backward compatibility concerns related to transition from isc-dhcp.
Code PRs:
sonic-dhcp-relay
yang-model
sonic-buildimage
sonic-swss-common
Testplan HLD
sonic-mgmt test
CLIs