Ccna routing and Switching Complete Study Guide

config t

R2(config)#

int fa0/1

R2(config-if)#

no ipv6 traffic-filter Block_Telnet out

R2(config-if)#

ipv6 traffic-filter Block_Telnet in

Step 7: Retest your ACL.

R1#

Server1

 

Trying 2001:DB8:3C4D:1:A14C:8C33:2D1:BE3D ...% Connection timed out; remote host 

not responding

R1#

 

Looks good! Although I don’t recommend using this method to block Telnet to a router, 

it was a great way to test our IPv6 ACLs.

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862

 

Chapter 20 

■

  Troubleshooting IP, IPv6, and VLANs

Troubleshooting VLAN Connectivity

You know by now that VLANs are used to break up broadcast domains in a layer 2 

switched network. You’ve also learned that we assign ports on a switch into a VLAN 

broadcast domain by using the 

switchport access vlan

 command.

The access port carries traffic for a single VLAN that the port is a member of. If members of 

one VLAN want to communicate to members in the same VLAN that are located on a different 

switch, then a port between the two switches needs to be either configured to be a member of this 

single VLAN or configured as a trunk link, which passes information on all VLANs by default.

We’re going to use Figure 20.7 to reference as we go through the procedures for trouble-

shooting VLAN and trunking.

f I g u r e   2 0 . 7     VLAN connectivity

Gi0/14

Gi0/2

Gi0/1

PC2

VLAN 10

192.168.10.2

PC1

VLAN 10

192.168.10.1

Gi0/3

Gi0/14

Gi0/13

Gi0/13

VLAN 10

192.168.10.3