Imagine you are trying to ping a device from your Cisco Switch or a Cisco Router, but by mistake you type a wrong IP address, instead of waiting for the device to give a request time out you can about the ping sequence in your Cisco Device by pressing <CTRL-SHIFT-6> twice in succession. The Cisco Switch or a Cisco Router mentions there is an escape sequence, but doesn’t tell you what it is!

From above picture notice that the ping sequence stopped at 3^rd packet.  -5 packets is the default. This combination works for trace route as well pings, both extended and regular.

Dear all lets proceed further with the configuration of the Cisco Catalyst 3560 Switch

Configure the Cisco Catalyst 3560 Switch.

In this step we will configure the Cisco Catalyst 3560 Switch port which is connected to the Cisco Aironet 1250 Series Access Point to the wired network. We will configure the Cisco Catalyst 3560 Switch port, which is connected to the Cisco Aironet 1250 Series Access Point as trunk port because this port will carries traffic for all the VLANs on the wired network. In our case the VLANs are VLAN 101, 102 and the native VLAN 100.

When you configure the Cisco Catalyst 3560, which connects to the Cisco Aironet 1250 Series Access Point ,ensure that the native VLANs that you configure match the native VLAN on the Cisco Aironet 1250 Series Access Point. Otherwise, frames are dropped. In order to configure the trunk port on the Cisco Catalyst 3560 Switch, use the following commands from the CLI on the Cisco Catalyst 3560 switch:

Note: In our scenario the Cisco Aironet 1250 Series Access Point is connected to a Cisco Catalyst 3560 Switch to the port number Giga Ethernet 0/20

ITKE-Cisco(config)#interface interface gigabitEthernet 0/20

ITKE-Cisco(config-if)# switchport mode trunk

ITKE-Cisco(config-if)#switchport trunk encapsulation dot1q

ITKE-Cisco(config-if)#switchport trunk native vlan 100

ITKE-Cisco(config-if)#switchport trunk allowed vlan 101,102

ITKE-Cisco(config-if)#switchport nonegotiate

ITKE-Cisco(config-if)#

(The above commands configures the Giga Ethernet port 0/20  as trunk port, with a dot1q encapsulation , with VLAN 100 as a native trunk VLAN ).

Note: Cisco IOS Software-based Aironet wireless equipment does not support Dynamic Trunking Protocol (DTP). Therefore, the Cisco Catalyst 3560 must not try to negotiate DTP.

With this configuration we have successfully completed the configuration of multiple SSIDs in the Cisco Aironet 1250 Series Access Point . In the coming post I will post the snap shots for the connection established to SSIDS ADMIN and GUEST. Basically we will test the connectivity with the ping command.

You can find more details about  Network Layer Utilities  in detail, how they work etc.