Today I will be sharing some basic command which we can implement on the switch.
Let's say we have a switch and first we want to change the hostname of the switch from "Switch to TEST", then below is a command which we can use to change the hostname of the switch.
Go into the config mode :
Switch#config t
Enter configuration commands, one per line.End with CNTL/Z.
Switch(config)#hostname TEST
TEST(config)#
Now we can see that the name of the switch is a TEST.
Let's verify the interfaces of the switch and its status.
TEST#show ip interface brief
InterfaceIP-AddressOK? Method StatusProtocol
FastEthernet1unassignedYES unsetupup
TenGigabitEthernet1/1unassignedYES unsetdowndown
TenGigabitEthernet1/21 unassignedYES unsetdowndown
TenGigabitEthernet1/28 unassignedYES unsetdowndown
TenGigabitEthernet1/29 unassignedYES unsetupup
TenGigabitEthernet1/30 unassignedYES unsetdowndown
TenGigabitEthernet1/31 unassignedYES unsetupup
TenGigabitEthernet1/32 unassignedYES unsetupup
Vlan1unassignedYES unsetupup
Above we can see the interface as well as vlan along with the status. If we want to check the status of one particular interface then we can use the below-given command
TEST#show ip interface FastEthernet1 (where FastEthernet is nothing but my interface)
FastEthernet1 is up, line protocol is up
Internet protocol processing disabled.
WE CAN SEE THAT THE INTERNET PROTOCOL IS DISABLE, BECAUSE WE HAVE NOT to ASSIGN ANY IP ADDRESS TO THE INTERFACE TILL NOW.
TEST#show running-config interface fastEthernet1
Building configuration...
Current configuration : 95 bytes
!
interface FastEthernet1
vrf forwarding mgmtVrf
no ip address
speed auto
duplex auto
End
Now I would like to see whether the interfacefastEthernet1 is Layer 2 or Layer 3.
TEST#show interfaces fastEthernet1 switchport
% Fa1 is not a switchable port
From the above output, we can see that it is showing "% Fa1 is not a switchable port", it means no switch port. Now let's understand the difference between the switch port and no switchport.
"noswitchport" enabled L3 features on the port, you can give it an IP address, perform ip routing etc, which is usually seen on a Layer 3 switch."no switchport" changes the port from being a Layer 2 interface to a layer 3 interface. So a port with "no switchport" is not a member of any vlan, it is as you say a routed port and you can then configure an IP address on it.It changes the port from being a Layer 2 interface to a layer 3 interface.
On the other hand, The switch portis used to set port operation mode for VLAN access or trunking mode. A switch port can be in one of two modes:accessandtrunk.
Let's assign the IP address on the inteface fastEthernet1, we have already verified above that this is a layer3 interface.
TEST(config)#interface fastEthernet1
TEST(config-if)#ip address 10.197.218.244 255.255.255.248
I am assigning the IP address along with the subnet mask.
TEST(config-if)#no shutdown (to make the interface up)
TEST(config-if)#do wr mem (saving the config)
Building configuration...
Compressed configuration from 2205 bytes to 1098 bytes[OK]
Now let's verify the interface fastEthernet1 which we have configured just now.
TEST#show ip interface fastEthernet1
FastEthernet1 is up, line protocol is up
Internet address is 10.197.218.244/29
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Outgoing access list is not set
Inboundaccess list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP Flow switching is disabled
IP CEF switching is enabled
IP CEF switching turbo vector
IP Null turbo vector
VPN Routing/Forwarding "mgmtVrf"
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, CEF
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Probe proxy name replies are disabled
Policy routing is disabled
Network address translation is disabled
BGP Policy Mapping is disabled
Input features: MCI Check
IPv4 WCCP Redirect outbound is disabled
IPv4 WCCP Redirect inbound is disabled
IPv4 WCCP Redirect exclude is disabled
Now let's check the other interface TenGigabitEthernet1
TEST#show interfaces TenGigabitEthernet1/31 switchport
Name: Te1/31
Switchport: Enabled
We can see that the switch port is enabled that means this is a layer 2 interface, let's try to assign an IP address to this and see what will be the outcome for it
TEST(config-if)#interface TenGigabitEthernet1/31
TEST(config-if)#ip address ?
% Unrecognized command
We can see from the above output it is showing "% Unrecognized command", beacuse it is layer 2 interface and we can not assign the IP address to it. If you want to assign the IP address to it, then follow the below command:
GO into the config mode, then in the interface :
TEST(config)#interface TenGigabitEthernet1/31
TEST(config-if)#no switchport (I am using this command "no switchport" to convert the interface from layer 2 to layer 3)
TEST(config-if)#ip add
TEST(config-if)#ip address 10.1.1.10 255.255.255.0
TEST(config-if)#do wr mem
Building configuration...
Compressed configuration from 2256 bytes to 1125 bytes[OK]
Now we can see from the above output that after converting the interface into the layer 3 interface we are able to assign the IP address.
In my next article, I would be talking about the other basic command related to the switch.
