Ccna routing and Switching Complete Study Guide



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Todd Lammle-CCNA Routing and Switching Complete Study Guide Exam 100-105, Exam 200-105, Exam 200-125-Sybex (2016)

sh mac address-table

          Mac Address Table

-------------------------------------------

 

Vlan    Mac Address       Type        Ports



----    -----------       --------    -----

 All    0100.0ccc.cccc    STATIC      CPU

 [output cut]

   1    001b.d40a.0538    DYNAMIC     Gi0/13

   1    0021.1bee.a70d    DYNAMIC     Gi0/13

   1    b414.89d9.1884    DYNAMIC     Gi0/17




Troubleshooting VLAN Connectivity 

865

   1    b414.89d9.1885    DYNAMIC     Gi0/18

   1    ecc8.8202.8285    DYNAMIC     Gi0/16

Total Mac Addresses for this criterion: 26

Referring back to Figure 20.7, we can see that the host is connected to Gi0/3. The prob-

lem here is that we don’t see a MAC address dynamically associated to Gi0/3 in the MAC 

address table. So what do we know so far that can help us? Well first, we can see that Gi0/3 

is configured into VLAN 10, but that VLAN is inactive. Second, the host off of Gi0/3 

doesn’t appear in the CAM table. Now would be a good time to take a look at the VLAN 

database like this:

S2#

sh vlan brief

 

VLAN Name                             Status    Ports



---- -------------------------------- --------- -------------------------------

1    default                          active    Gi0/1, Gi0/2, Gi0/4, Gi0/5

                                                Gi0/6, Gi0/7, Gi0/8, Gi0/9

                                                Gi0/10, Gi0/11, Gi0/12, Gi0/13

                                                Gi0/14, Gi0/15, Gi0/16, Gi0/17

                                                Gi0/18, Gi0/19, Gi0/20, Gi0/21

                                                Gi0/22, Gi0/23, Gi0/24, Gi0/25

                                                Gi0/26, Gi0/27, Gi0/28

26   Automation10                     active

27   VLAN0027                         active

30   Engineering                      active

170  VLAN0170                         active

[output cut]

Look at that: there is no VLAN 10 in the database! Clearly the problem, but also an 

easy one to fix by simply creating the VLAN in the database:

S2#



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