3.4.1.1 Documentation Tree Instructions Answers

3.4.1.1 Documentation Tree (Instructor Version)

Instructor Note: Red font color or Gray highlights indicate text that appears in the instructor copy only.

Objective

Identify common STP configuration issues.

Instructor Note: This activity may be completed individually or in small groups.

Scenario

The employees in your building are having difficulty accessing a web server on the network. You look for the network documentation that the previous network engineer used before he transitioned to a new job; however, you cannot find any network documentation whatsoever.

Therefore, you decide create your own network recordkeeping system. You decide to start at the access layer of your network hierarchy. This is where redundant switches are located, as well as the company servers, printers, and local hosts.

You create a matrix to record your documentation and include access layer switches on the list. You also decide to document switch names, ports in use, cabling connections, and root ports, designated ports, and alternate ports.

For more detailed instructions on how to design your model, use the student PDF that accompanies this activity.

Resources

• Packet Tracer software
• Word processing software

Directions

Step 1: Create the topology diagram with three redundant switches.

Step 2: Connect host devices to the switches.

Step 3: Create the switch documentation matrix.

a. Name and switch location

b. General switch description

c. Model, IOS version, and image name

d. Switch serial number

e. MAC address

f. Ports currently in use

g. Cable connections

h. Root ports

i. Designated ports, status, and cost

j. Alternate ports, status, and cost

Step 4: Use show commands to locate Layer 2 switch information.

a. show version

b. show cdp neighbors detail

c. show spanning-tree

Instructor – Example Activity Answer

Topology Diagram Example

Documentation Form Example (S1 only)

S1# show version  
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX, RELEASE  
SOFTWARE (fc1)  
Copyright (c) 1986-2005 by Cisco Systems, Inc.  
Compiled Wed 12-Oct-05 22:05 by pt_team  
  
ROM: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(25r)FX, RELEASE SOFTWARE (fc4)  
  
System returned to ROM by power-on  
  
Cisco WS-C2960-24TT (RC32300) processor (revision C0) with 21039K bytes of memory.    
  
24 FastEthernet/IEEE 802.3 interface(s)  
2 Gigabit Ethernet/IEEE 802.3 interface(s)  
  
63488K bytes of flash-simulated non-volatile configuration memory.  
Base ethernet MAC Address       : 0050.0F5C.A2D1  
Motherboard assembly number     : 73-9832-06  
Power supply part number        : 341-0097-02  
Motherboard serial number       : FOC103248MJ  
Power supply serial number      : DCA102133JA  
Model revision number           : B0  
Motherboard revision number     : C0  
Model number                    : WS-C2960-24TT  
System serial number            : FOC1033Z1EY  
Top Assembly Part Number        : 800-26671-02  
Top Assembly Revision Number    : B0  
Version ID                      : V02  
CLEI Code Number                : COM3K00BRA  
Hardware Board Revision Number  : 0x01    
  
Switch   Ports  Model              SW Version              SW Image  
------   -----  -----              ----------              ----------  
*    1   26     WS-C2960-24TT      12.2                    C2960-LANBASE-M  
  
Configuration register is 0xF  
  
S1#
S1# show cdp neighbors detail  
  
Device ID: S2  
Entry address(es):   
Platform: cisco 2960, Capabilities: Switch  
Interface: GigabitEthernet1/1, Port ID (outgoing port): GigabitEthernet1/1  
Holdtime: 151  
  
Version :  
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX, RELEASE  
SOFTWARE (fc1)  
Copyright (c) 1986-2005 by Cisco Systems, Inc.  
Compiled Wed 12-Oct-05 22:05 by pt_team  
  
advertisement version: 2  
Duplex: full  
---------------------------  
  
Device ID: S3  
Entry address(es):   
Platform: cisco 2960, Capabilities: Switch  
Interface: GigabitEthernet1/2, Port ID (outgoing port): GigabitEthernet1/2  
Holdtime: 151  
  
Version :  
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX, RELEASE  
SOFTWARE (fc1)  
Copyright (c) 1986-2005 by Cisco Systems, Inc.  
Compiled Wed 12-Oct-05 22:05 by pt_team  
  
advertisement version: 2  
Duplex: full  
  
S1#

S1# show spanning-tree  
VLAN0001  
  Spanning tree enabled protocol ieee  
  Root ID    Priority    32769  
             Address     0001.635E.CE64  
             Cost        4  
             Port        26(GigabitEthernet1/2)  
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec  
  
  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)  
             Address     0050.0F5C.A2D1  
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec  
             Aging Time  20  
  
Interface        Role Sts Cost      Prio.Nbr Type  
---------------- ---- --- --------- -------- --------------------------------  
Fa0/1            Desg FWD 19        128.1    P2p  
Fa0/3            Desg FWD 19        128.3    P2p  
Fa0/2            Desg FWD 19        128.2    P2p  
Gi1/1            Altn BLK 4         128.25   P2p  
Gi1/2            Root FWD 4         128.26   P2p  
  
S1#

Identify elements of the model that map to IT-related content:

• Designated ports
• Root ports
• Alternate ports
• STP switch commands output
• LAN, Access-Layer documentation