BDL 2.3 Buzzwords Flashcards
This switch is capable of routing without the need of a router. Out of the box, this type of switch is L2.
MLS - multi layer switch, L3 switch.
These represent your default gateways for each VLAN in the network configured in a L3 switch or mls.
Interface VLAN
Characteristic of L3 devices, also known as the management IP.
Interface loopback
It is the configuration of routing a L3 device for traffic from different VLANs to be forwarded through the network.
inter-vlan routing
a logical L3 interface created to house VLAN traffic information. Characteristic of switches only, you configure protocols like the default gateways, HSRP, etc. of the network’s different broadcast domains.
SVI or switch virtual interface
run under configuration mode to show you the VLANS that are created in the switch.
(config)#do show vlan
This configuration command needs to be run under global configuration mode. Where xxx is the VLAN number you are trying to create.
(config)#vlan xxx
Command run under configuration mode to configure loopback and to create it if it does not exist in the switch already. For redundancy purposes, you can always have more than one loopback.
(config)#int loop0
Command run under configuration mode to configure a VLAN interface, where xxx is the VLAN you are trying to associate this interface with.
(config)#int Vlanxxx
used to verify if the interfaces were configured correctly.
(config)#do show ip interface brief/ do sh ip int br
to show the overall configurations in your L3 switch.
(config)#do show run
configuration to convert a dynamic desirable port, to an access port to connect a host.
(config)#switchport mode access
configuration inside an access port to tag it with a VLAN.
(config)#switchport access vlan xx
configuration inside an access port after being tagged with a VLAN, see Switchport access VLANxx; this helps prevent loops and should only be configured in an access port.
(config)#spanning-tree portfast
configuration in a port to make sure that the interface is up and ready to receive traffic. Default configuration in most switch devices for ports is ‘shut’ or down/down.
(config)#no shut
command under configuration mode, to verify that ports f0/x are assigned to the correct VLANS.
(config)#do show vlan, do sh vlan
to verify if routing is turned on in L3 switch and see the routing table; if not turned on, you will see the following message:
‘ICMP redirect cache is empty’
If it is turned on you will see the routing table with codes a message of ‘Gateway of last resort is not set’ and the directly connected devices via the local interfaces.
show ip route
configuration under config t mode to turn on routing capabilities in a L3 switch.
(config)#ip routing
this show command will allow you to see any log messages that your device has captured, like checking if certain interfaces went down.
Show logging
banner message of the day, configuration command under config t, will allow you to display a message when you are first trying to login to a device. This is typically used to display a permanent message.
(config)#1Banner motd
