Regarding the issue with NHRP

[gh0813]

Description

Regarding the issue with NHRP, I used version 10.2 of FRR to create a basic NHRP environment, but there was no direct communication between the two spoke nodes. At first, I thought it was my mistake that caused the problem. Later, I used the built-in test topology NHRP-REDUNDANCY/test_nhrpUREDUNDANCYPy in the FRR source code, and found that there was also a problem. NHC1 showed IP NHRP shortcut, but the display information was empty

Version

test@test:~/frr/tests/topotests$ sudo -E python3 -m pytest -s --topology-only nhrp_redundancy/test_nhrp_redundancy.py
=================================================================== test session starts ====================================================================
platform linux -- Python 3.12.3, pytest-8.3.4, pluggy-1.5.0
rootdir: /home/test/frr/tests/topotests
configfile: pytest.ini
plugins: xdist-3.6.1, asyncio-0.24.0
asyncio: mode=Mode.AUTO, default_loop_scope=module
collected 4 items

nhrp_redundancy/test_nhrp_redundancy.py
--- Munet CLI Starting ---


munet> nhc1 show ip nhrp sh
% No entries
munet> nhc1 show ip nhrp ?
  <cr>
  cache     Forwarding cache information
  json      JavaScript Object Notation
  nhs       Next hop server information
  opennhrp  opennhrpctl style cache dump
  shortcut  Shortcut information
munet> nhc1 show ip nhrp shortcut
% No entries
munet> nhc2 show ip nhrp shortcut
% No entries
munet> nhs2 show ip nhrp shortcut
% No entries
munet> nhs1 show ip nhrp shortcut
% No entries

How to reproduce

test@test:~/frr/tests/topotests$ sudo -E python3 -m pytest -s --topology-only nhrp_redundancy/test_nhrp_redundancy.py
=================================================================== test session starts ====================================================================
platform linux -- Python 3.12.3, pytest-8.3.4, pluggy-1.5.0
rootdir: /home/test/frr/tests/topotests
configfile: pytest.ini
plugins: xdist-3.6.1, asyncio-0.24.0
asyncio: mode=Mode.AUTO, default_loop_scope=module
collected 4 items

nhrp_redundancy/test_nhrp_redundancy.py
--- Munet CLI Starting ---

munet> nhc1 show ip nhrp sh
% No entries
munet> nhc1 show ip nhrp ?

cache Forwarding cache information
json JavaScript Object Notation
nhs Next hop server information
opennhrp opennhrpctl style cache dump
shortcut Shortcut information
munet> nhc1 show ip nhrp shortcut
% No entries
munet> nhc2 show ip nhrp shortcut
% No entries
munet> nhs2 show ip nhrp shortcut
% No entries
munet> nhs1 show ip nhrp shortcut
% No entries

Expected behavior

Two spots can communicate directly

Actual behavior

The two spokes did not achieve direct communication

Additional context

No response

Checklist

• I have searched the open issues for this bug.
• I have not included sensitive information in this report.

[gh0813]

@ton31337 Can you help me take a look at this issue? Thank you