ip routing Flashcards
Router on a stick
vlans connected through a trunk interface
subinterfaces are created on the physical interface which represent different vlans
both sides must be switch mode trunk
command to create a sub int
interface Gig0/0.10
encapsulation dot1q 10 - for vlan 10, attaches to vlan
ip address 192.x.x.x 255.x.x.x
subint no. doesnt have to match vlan no
what command attaches subint to vlan
encapsulation dot1q 10
2 ways to route the native vlan
createa subint for it and attach it with encapsulation dot1q 10 native
or use physical interface
commands to verify roas
show vlans
show ip route connected
troubleshooting roas
check both sides
check encapsulation command
check subints
check for native command
check native vlans are same on both sides
check for ints shutdown
investigate from LAN switch side because router cannot tell
L3 switches use these for larger lan routing
Switched virtual interfaces
how to enable svis
sdm prefer lanbase routing reload ip routing vlan 10 -create vlan in vlan conf mode- set ip no shutdown to enable the vlan interface
command to verify routing
show ip route
troubleshooting svis
check ip routing enabled with sdm prefer etc..
check vlans known and active
make sure one physical int up/up using the vlan
vlan must not be down
vlan int must be shutdown
routed port
port that has l3 functionality
strip headers
make decisions based on IP
encap and forward
When to use a routed port or svi
svi used when many interfaces use a vlan/subnet
routed ports best for one physical interfaces connects to a subnet
verify routed ports commands
show interfaces
show interfaces status
show ip route
WHy use Layer 3 etherchannel
better balancing
how to configure etherchannel on an interface
in int conf mode
channel-group 3 mode on
no switchport -makes routed port
