[add-topo] Refresh ARP table of neighbors with new MAC of new PTF#836
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lguohan merged 1 commit intosonic-net:masterfrom Apr 5, 2019
wangxin:add-topo-pr
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[add-topo] Refresh ARP table of neighbors with new MAC of new PTF#836lguohan merged 1 commit intosonic-net:masterfrom wangxin:add-topo-pr
lguohan merged 1 commit intosonic-net:masterfrom
wangxin:add-topo-pr
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… PTF container The PTF container will be destroyed if testbed-cli.sh remove-topo is executed. Run testbed-cli.sh add-topo will add a new PTF conainer. Usually the new PTF container will have a new MAC address. If add-topo is executed immediately after remove-topo, ARP table of neighbor switches and hosts may still have entry of the old PTF MAC address. This would cause connectivity issue to the new PTF container for a while until the old PTF MAC address is expired. This workaround is to send out an ARPing from the PTF container querying mgmt_gw after new PTF container is deployed and attached to network. The ARPing request will be broadcasted to all neighbors on same LAN and will refresh ARP table of neighbors with new MAC address of new PTF. Signed-off-by: Xin Wang <[email protected]>
Contributor
|
does this only affect the mgmt network? It looks like you only ARP for the mgmt gw. |
Collaborator
Author
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@lguohan Yes, it only affects the mgmt network. Without this workaround, we experienced connectivity issue to mgmt IP of re-deployed PTF container. |
liat-grozovik
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Mar 28, 2019
yxieca
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Apr 5, 2019
… PTF container (#836) The PTF container will be destroyed if testbed-cli.sh remove-topo is executed. Run testbed-cli.sh add-topo will add a new PTF conainer. Usually the new PTF container will have a new MAC address. If add-topo is executed immediately after remove-topo, ARP table of neighbor switches and hosts may still have entry of the old PTF MAC address. This would cause connectivity issue to the new PTF container for a while until the old PTF MAC address is expired. This workaround is to send out an ARPing from the PTF container querying mgmt_gw after new PTF container is deployed and attached to network. The ARPing request will be broadcasted to all neighbors on same LAN and will refresh ARP table of neighbors with new MAC address of new PTF. Signed-off-by: Xin Wang <[email protected]>
kazinator-arista
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Mar 4, 2026
Make sure db_migrator is run after all config are loaded during (sonic-net#926) Vnet alias mapping (sonic-net#924) Changes to make lldp show command for multi-npu platforms. (sonic-net#914) [Mellanox] Fix thermal control issue: use natural sort for fan status and thermal status (sonic-net#836) [Mellanox] add document for thermal control related cli (sonic-net#832)
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Description of PR
Summary:
Fixes # (issue)
The PTF container will be destroyed if testbed-cli.sh remove-topo is
executed. Run testbed-cli.sh add-topo will add a new PTF conainer.
Usually the new PTF container will have a new MAC address. If add-topo
is executed immediately after remove-topo, ARP table of neighbor
switches and hosts may still have entry of the old PTF MAC address. This
would cause connectivity issue to the new PTF container for a while
until the old PTF MAC address is expired.
This workaround is to send out an ARPing from the PTF container querying
mgmt_gw after new PTF container is deployed and attached to network.
The ARPing request will be broadcasted to all neighbors on same LAN and
will refresh ARP table of neighbors with new MAC address of new PTF.
Type of change
Approach
How did you do it?
Send an ARPing request from the PTF container after it is deployed and attached to network.
How did you verify/test it?
Tested on Mellanox platform
Any platform specific information?
No
Supported testbed topology if it's a new test case?
Documentation