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ScalingVLANs_EtherChannel Cheat Sheet by

networking

Config­uring VTP

S2(con­fig)# vtp domain CCNA
Sets the VTP domain
S2(con­fig)# vtp mode [serve­r|c­lie­nt|­tra­nsp­arent]
Sets VTP mode
S2(con­fig)# vtp password cisco
Sets VTP password to cisco
S2# show vtp status
Shows VTP config­uration
VTP is used to make VLAN config­uration more effort­less. VLANs are configured on the VTP, while a VTP client simply synchr­onizes its config­uration with the VTP server. A transp­arent switch forwards packets without synchr­onizing its config­ura­tion.

Config­uring DTP

S1(con­fig­-if)# switchport mode xyz
Configures dynamic trunk link
xyz = access
Sets trunking mode to ACCESS
xyz = trunk
Sets trunking mode to TRUNK
xyz = dynamic desirable
Sets trunking mode to dynamic desirable
xyz = dynamic auto
Sets trunking mode to dynamic auto
S1(con­fig­-if)# switchport access vlan 10
Sets vlan 10 to an interface
S1# show interfaces trunk
To confirm trunk config­uration
All variations of modes result in the TRUNK mode except when:
- one of both ports is set to access
- both ports are dynamic auto

LACP

S1(con­fig)# interface range f0/x-y
Selects all interfaces from x to y
S1(con­fig­-if­-ra­nge)# switchport mode trunk
Sets switchport mode to trunk
S1(con­fig­-if­-ra­nge)# switchport trunk native vlan 99
Sets native VLAN to 99
S1(con­fig­-if­-ra­nge)# channe­l-group 2 mode active
Adds the current interf­ace(s) to channel group 2
S1(con­fig­-if­-ra­nge)# no shutdown
Activates the interf­ace(s)
LACP is an open source protocol for Link Aggreg­ation.
Link Aggreg­ation summarizes multiple physical connec­­tions into one virtual connec­­tion.
 

VLAN Config­uration

S1(con­fig)# vlan 10
Creates a VLAN with an id of 10
S1(con­fig­-vlan)# name test
Sets the name of a vlan
S1# show vlan brief
Shows vlan config­uration

Extended VLANs

S1(con­fig)# vtp mode transp­arent
Sets VTP mode to transp­arent
S1(con­fig)# vlan 2222
Creates a vlan with an id of 2222
To be able to configure extendes VLANs, the vtp mode of the switch must be configured as transp­arent.
All VLANs with an id of 1006 or higher are extended VLANs.

EtherC­hannel

S1(con­fig)# interface range f0/x-y
Selects all interfaces from x to y
S1(con­fig­-if­-ra­nge)# channe­l-group 1 mode [mode]
Adds the current interf­ace(s) to etherc­hannel 1
S1(con­fig­-if­-ra­nge)# no shutdown
Activates the interf­ace(s)
S1(con­fig)# interface port-c­hannel 1
Enters the config­uration mode of etherc­hannel 1
S1(con­fig­-if)# switchport mode trunk
Sets the switchport mode
S1(con­fig­-if)# switchport trunk native vlan 99
Sets the native VLAN
S1# show etherc­hannel summary
Shows a summary of channel groups
EtherC­hannel is a Cisco-­pro­pri­etary Link Aggreg­ation.

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