commands for cisco_devices

Cisco Devices

The Command-Line InterfaceShortcuts for Entering Commands

Using the [tab] Key to Complete Commands

Using the Question Mark for Help

enable Command

exit Command

disable Command

logout Command

Setup Mode

Keyboard Help

show Commands

Configuring a Router

Configuring a Single Cisco RouterRouter Modes

Entering Global Configuration Mode

Configuring a Router Name

Configuring Passwords

Password Encryption

Configuring a Serial Interface

Configuring a Fast Ethernet Interface

Creating a Message-of-the-Day Banner

Creating a Login Banner

Setting the Clock Time Zone

Assigning a Local Host Name to an IP Address

The no ip domain-lookup Command

The logging synchronous Command

The exec-timeout Command

Saving Configurations

Erasing Configurations

show Commands

EXEC Commands in Configuration Mode: The do Command

Configuration Example: Basic Router Configuration

Boston Router

Routing

Static RoutingConfiguring a Static Route on a Router

Static Routes and Administrative Distance (Optional)

Router(config)#ip route 172.16.20.0 255.255.255.0 172.16.10.2 permanentRouter(config)#ip route 172.16.20.0 255.255.255.0 172.16.10.2 200

Configuring a Default Route on a Router

Verifying Static Routes

Router#show ip route

Configuration Example: Static Routes

Boston Router

Buffalo Router

Bangor Router

RIPThe ip classless Command

RIP Routing: Mandatory Commands

RIP Routing: Optional Commands

Troubleshooting RIP Issues

Configuration Example: RIPv2 Routing

Cancun Router

Acapulco Router

Mazatlan Router

EIGRPConfiguring Enhanced Interior Gateway Routing Protocol (EIGRP)

EIGRP Auto-Summarization

Load Balancing: variance

Bandwidth Use

Authentication

Verifying EIGRP

Troubleshooting EIGRP

Configuration Example: EIGRP

Austin Router

Houston Router

Single Area OSPFConfiguring OSPF: Mandatory Commands

Using Wildcard Masks with OSPF Areas

Configuring OSPF: Optional Commands

Loopback Interfaces

Router ID

DR/BDR Elections

Modifying Cost Metrics

Authentication: Simple

Authentication: Using MD5 Encryption

Timers

Propagating a Default Route

Verifying OSPF Configuration

Troubleshooting OSPF

Configuration Example: Single Area OSPF

Austin Router

Houston Router

Galveston Router

Switching

Configuring a SwitchHelp Commands

Command Modes

Verifying Commands

Resetting Switch Configuration

Setting Host Names

Setting Passwords

Setting IP Addresses and Default Gateways

Setting Interface Descriptions

Setting Duplex Operation

Setting Operation Speed

Managing the MAC Address Table

Configuring Static MAC Addresses

Switch Port Security

Verifying Switch Port Security

Sticky MAC Addresses

Configuration Example

VLANsCreating Static VLANs

Using VLAN Configuration Mode

Using VLAN Database Mode

Assigning Ports to VLANs

Using the range Command

Verifying VLAN Information

Saving VLAN Configurations

Erasing VLAN Configurations

Configuration Example: VLANs

VLAN Trunking Protocol and Inter-VLAN RoutingDynamic Trunking Protocol (DTP)

Setting the Encapsulation Type

VLAN Trunking Protocol (VTP)

Using VLAN Database Mode

Verifying VTP

Inter-VLAN Communication Using an External Router:

Router-on-a-Stick

Inter-VLAN Communication Tips

Router(config)#interface fastethernet 0/0Router(config-if)#encapsulation dot1q 1 nativeRouter(config-if)#ip address 192.168.1.1 255.255.255.0Router(config-if)#interface fastethernet 0/0.10Router(config-subif)#encapsulation dot1q 10Router(config-subif)#ip address 192.168.10.1 255.255.255.0

Configuration Example: Inter-VLAN Communication

ISP Router

CORP Router

L2Switch1 (Catalyst 2960)

STP and EtherChannelSpanning Tree Protocol

Enabling Spanning Tree Protocol

Configuring the Root Switch

Configuring a Secondary Root Switch

Configuring Port Priority

Configuring the Path Cost

Configuring the Switch Priority of a VLAN

Configuring STP Timers

Verifying STP

Optional STP Configurations

PortFast

BPDU Guard

Changing the Spanning-Tree Mode

Different types of spanning tree can be configured on a Cisco switch. The options varyaccording to the platform:• Per-VLAN Spanning Tree (PVST)—There is one instance of spanning tree for eachVLAN. This is a Cisco proprietary protocol.• Per-VLAN Spanning Tree Plus (PVST+)—Also Cisco proprietary. Has addedextensions to the PVST protocol.• Rapid PVST+—This mode is the same as PVST+ except that it uses a rapidconvergence based on the 802.1w standard.• Multiple Spanning Tree Protocol (MSTP)—IEEE 802.1s. Extends the 802.1wRapid Spanning Tree (RST) algorithm to multiple spanning trees. Multiple VLANscan map to a single instance of RST. You cannot run MSTP and PVST at the sametime.

Extended System ID

Enabling Rapid Spanning Tree

Troubleshooting Spanning Tree

Configuration Example: STP

Core Switch (2960)

Distribution 1 Switch (2960)

Distribution 2 Switch (2960)

EtherChannel

EtherChannel provides fault-tolerant, high-speed links between switches, routers, andservers. An EtherChannel consists of individual Fast Ethernet or Gigabit Ethernet linksbundled into a single logical link. If a link within an EtherChannel fails, traffic previouslycarried over that failed link changes to the remaining links within the EtherChannel.

Interface Modes in EtherChannel

Guidelines for Configuring EtherChannel

Configuring Layer 2 EtherChannel

Verifying EtherChannel

Configuration Example: EtherChannel

Core (2960)

ALSwitch1 (2960)

ALSwitch2 (2960)

Extending the LAN

Implementing a Wireless LAN