[Nexthop] Distro CLI getip and ssh commands#975
Open
travisb-nexthop wants to merge 1 commit intofacebook:mainfrom
Open
[Nexthop] Distro CLI getip and ssh commands#975travisb-nexthop wants to merge 1 commit intofacebook:mainfrom
travisb-nexthop wants to merge 1 commit intofacebook:mainfrom
Conversation
The Distro CLI getip and ssh commands make a best-effort attempt to determine an IP for the given switch based on its MAC address and then either return that IP or directly ssh to it. It does so by connecting to the Distro Infra container and checking on the configured interface for pre-existing IP neighbor/ARP entries. If no such entries are found it will attempt a subnet ping to refresh the Linux kernel neighbor entries. In most cases this is sufficient after the system has PXE booted and therefore the neighbor cache is filled. Testing is as easy as starting the Distro Infra container: ``` $ ./distro_infra.sh --intf eth1 --persist-dir data ``` Then running the fboss-image device getip command with the appropriate MAC address: ``` $ ./fboss-image device dc:da:4d:fc:ad:2d getip [0.00s] Getting IP for device dc:da:4d:fc:ad:2d 10.250.33.2 ```
This was referenced Mar 4, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Pre-submission checklist
pip install -r requirements-dev.txt && pre-commit installpre-commit runSummary
The Distro CLI getip and ssh commands make a best-effort attempt to determine an IP for the given switch based on its MAC address and then either return that IP or directly ssh to it.
It does so by connecting to the Distro Infra container and checking on the configured interface for pre-existing IP neighbor/ARP entries. If no such entries are found it will attempt a subnet ping to refresh the Linux kernel neighbor entries.
In most cases this is sufficient after the system has PXE booted and therefore the neighbor cache is filled. In situations where this does not successfully find the IP, manually pinging the switch hostname will prime the cache.
Test Plan
Testing is as easy as starting the Distro Infra container:
Then running the fboss-image device getip command with the appropriate MAC address: