…c-net#23193)

In dualtor-aa topology, uplink ports receive LLDP PDUs from both
the T1 neighbor switch and the fanout switch. This causes
`show lldp table` to list multiple rows per interface (e.g.,
Ethernet224 appears twice - once for ARISTA01T1, once for fanout).

The test compared sorted lists of interfaces from APPL_DB
LLDP_ENTRY_TABLE (which stores one entry per interface) against
the parsed `show lldp table` output (which has duplicate entries).
This always failed on dualtor testbeds (29 DB keys vs 32 CLI rows).

Changes:
- Deduplicate interface list in get_show_lldp_table_output() using
  dict.fromkeys() to handle multiple LLDP neighbors per port
- Use set comparison instead of sorted list comparison in
  check_lldp_table_keys() and assert_lldp_interfaces()
- Add diff details to assertion error message for easier debugging

Signed-off-by: Zhaohui Sun <[email protected]>

…c-net#23193)

In dualtor-aa topology, uplink ports receive LLDP PDUs from both
the T1 neighbor switch and the fanout switch. This causes
`show lldp table` to list multiple rows per interface (e.g.,
Ethernet224 appears twice - once for ARISTA01T1, once for fanout).

The test compared sorted lists of interfaces from APPL_DB
LLDP_ENTRY_TABLE (which stores one entry per interface) against
the parsed `show lldp table` output (which has duplicate entries).
This always failed on dualtor testbeds (29 DB keys vs 32 CLI rows).

Changes:
- Deduplicate interface list in get_show_lldp_table_output() using
  dict.fromkeys() to handle multiple LLDP neighbors per port
- Use set comparison instead of sorted list comparison in
  check_lldp_table_keys() and assert_lldp_interfaces()
- Add diff details to assertion error message for easier debugging

Signed-off-by: Zhaohui Sun <[email protected]>
Signed-off-by: mssonicbld <[email protected]>

…) (#23435)

In dualtor-aa topology, uplink ports receive LLDP PDUs from both
the T1 neighbor switch and the fanout switch. This causes
`show lldp table` to list multiple rows per interface (e.g.,
Ethernet224 appears twice - once for ARISTA01T1, once for fanout).

The test compared sorted lists of interfaces from APPL_DB
LLDP_ENTRY_TABLE (which stores one entry per interface) against
the parsed `show lldp table` output (which has duplicate entries).
This always failed on dualtor testbeds (29 DB keys vs 32 CLI rows).

Changes:
- Deduplicate interface list in get_show_lldp_table_output() using
  dict.fromkeys() to handle multiple LLDP neighbors per port
- Use set comparison instead of sorted list comparison in
  check_lldp_table_keys() and assert_lldp_interfaces()
- Add diff details to assertion error message for easier debugging

Signed-off-by: Zhaohui Sun <[email protected]>
Signed-off-by: mssonicbld <[email protected]>
Co-authored-by: Zhaohui Sun <[email protected]>

…c-net#23193)

In dualtor-aa topology, uplink ports receive LLDP PDUs from both
the T1 neighbor switch and the fanout switch. This causes
`show lldp table` to list multiple rows per interface (e.g.,
Ethernet224 appears twice - once for ARISTA01T1, once for fanout).

The test compared sorted lists of interfaces from APPL_DB
LLDP_ENTRY_TABLE (which stores one entry per interface) against
the parsed `show lldp table` output (which has duplicate entries).
This always failed on dualtor testbeds (29 DB keys vs 32 CLI rows).

Changes:
- Deduplicate interface list in get_show_lldp_table_output() using
  dict.fromkeys() to handle multiple LLDP neighbors per port
- Use set comparison instead of sorted list comparison in
  check_lldp_table_keys() and assert_lldp_interfaces()
- Add diff details to assertion error message for easier debugging

Signed-off-by: Zhaohui Sun <[email protected]>
Signed-off-by: selldinesh <[email protected]>