PTL-0046 verification guide

Lab ID: PTL-0046
Title: LACP EtherChannel Member Mismatch Diagnosis
Status: TESTED_PASS (Verified live in Cisco Packet Tracer 9.0.1 via MCP loopback bridge automation)

1. Packet Tracer Topology Construction Manifest#

To construct or manually verify this topology in Cisco Packet Tracer:

Device Inventory#

Device Role	PT Device Model	Display Name	Modules / Slots
Distribution Switch 1	Cisco Catalyst 2960-24TT	SW-1	24 FastEthernet + 2 GigabitEthernet ports
Distribution Switch 2	Cisco Catalyst 2960-24TT	SW-2	24 FastEthernet + 2 GigabitEthernet ports
Engineering PC 1	PC-PT	PC-1	FastEthernet0 (`192.168.10.10/24`, VLAN 10)
Marketing PC 1	PC-PT	PC-2	FastEthernet0 (`192.168.20.10/24`, VLAN 20)
Engineering PC 2	PC-PT	PC-3	FastEthernet0 (`192.168.10.20/24`, VLAN 10)
Marketing PC 2	PC-PT	PC-4	FastEthernet0 (`192.168.20.20/24`, VLAN 20)

Physical Cabling Matrix#

Link ID	Source Device	Source Port	Destination Device	Destination Port	Cable Type
L-01	SW-1	FastEthernet0/1	SW-2	FastEthernet0/1	Copper Crossover
L-02	SW-1	FastEthernet0/2	SW-2	FastEthernet0/2	Copper Crossover
L-03	SW-1	FastEthernet0/10	PC-1	FastEthernet0	Copper Straight-Through
L-04	SW-1	FastEthernet0/20	PC-2	FastEthernet0	Copper Straight-Through
L-05	SW-2	FastEthernet0/10	PC-3	FastEthernet0	Copper Straight-Through
L-06	SW-2	FastEthernet0/20	PC-4	FastEthernet0	Copper Straight-Through

2. Positive Verification Test Matrix#

Test ID	Objective	Command / Procedure	Expected Result	Pass Criteria
POS-01	EtherChannel Logical Interface State	`SW-1# show etherchannel summary` `SW-2# show etherchannel summary`	Both switches display `Po1(SU)` indicating Layer 2 operational status (`S`) and in-use status (`U`).	Logical Port-channel 1 is up and functioning
POS-02	Member Interface Bundling State	`SW-1# show etherchannel summary` `SW-2# show etherchannel summary`	Both switches display `Fa0/1(P)` and `Fa0/2(P)` indicating member interfaces are bundled in port-channel.	Dual physical links aggregated into active bundle
POS-03	LACP Protocol Negotiation	`SW-1# show etherchannel port-channel` `SW-2# show etherchannel port-channel`	Both switches display `Protocol = LACP` and report 2 active bundled ports.	IEEE 802.3ad negotiation verified across both peers
POS-04	VLAN 10 (Engineering) Reachability	`PC-1> ping 192.168.10.20`	4/4 echo replies received with 0% packet loss.	Intra-VLAN 10 frames transported across EtherChannel trunk
POS-05	VLAN 20 (Marketing) Reachability	`PC-2> ping 192.168.20.20`	4/4 echo replies received with 0% packet loss.	Intra-VLAN 20 frames transported across EtherChannel trunk
POS-06	Layer 2 Inter-VLAN Isolation	`PC-1> ping 192.168.20.10`	Request timed out (100% loss).	Proper Layer 2 broadcast domain isolation maintained

3. Negative & Fault Tolerance Test Matrix#

Test ID	Fault Scenario	Injection Procedure	Observed Symptom	Recovery Procedure
NEG-01	Starter State: Member Port Mode Mismatch	In starter topology, execute `show etherchannel summary` and `show interfaces FastEthernet0/2 switchport` on `SW-2`.	`Fa0/2` is not bundled `(P)` in `Po1`. `Fa0/2` switchport mode is `static access` in VLAN 10, conflicting with trunk Port-channel 1.	Reconfigure `SW-2 Fa0/2` as trunk: `switchport mode trunk`, `switchport trunk native vlan 99`, `switchport trunk allowed vlan 10,20,99`.
NEG-02	Starter State: Degraded Bundle Capacity	In starter topology, execute `show etherchannel port-channel` on `SW-2`.	Switch reports only 1 active port bundled in group (degraded link capacity).	Align interface parameters on `Fa0/2` to match `Port-channel 1` and let LACP negotiate member inclusion.

4. Reload and Persistence Verification#

completed.pkt reloaded cleanly via ipc.appWindow().fileOpen().
Switches SW-1 and SW-2 preserved startup configurations from NVRAM across reload.
Full intra-VLAN reachability across VLAN 10 and VLAN 20 confirmed after reload.
Reopened starter.pkt cleanly and confirmed initial faulted state is intact for learner exercise.

Verification and Acceptance Matrix — PTL-0046