Chapter 1. Port Basic Configuration

- Overview of Basic Port Settings

- How to Configure Basic Port Settings

- Configuration Example: Basic Port Settings

Overview of Basic Port Settings

You can perform the following basic settings on a port:

- Entering interface configuration mode: Interface configuration mode is supported only on Ethernet ports.

- Enabling a port: By default, all device ports are enabled or in link-up state when a device is online. However, for security reasons, certain ports are disabled or in link-down state even when a device is online.

- Configuring port description: You can configure a port's description to identify the port.

- Configuring port speed: You can configure a port's speed to configure the rate of data flow.

- Configuring speed control: For every 2-Gigabits ports that are connected, and speeds configured in force mode, you need to configure one port in primary mode and the other in secondary mode to enable them to dock successfully.

How to Configure Basic Port Settings

The following sections provide configuration information for basic port settings.

- Enter Interface Configuration Mode

- Enable a Port

- Configure an Interface Description

- Configure Interface Speed

- Monitor Interfaces

Enter Interface Configuration Mode

To enter interface configuration mode, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface ethernet port-number

Example:

Device(config)# interface ethernet 1/1

Enters interface configuration mode

Step 4

interface range ethernet port-number to ethernet port-number

Example:

Device(config-if-ethernet-1/1)# interface range ethernet 1/1 to ethernet 1/4

Enters bulk port mode.

Enable a Port

To enable a port, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface ethernet port-number

Example:

Device(config)# interface ethernet 1/1

Enters interface configuration mode.

Step 4

no shutdown

Example:

Device(config-if-ethernet-1/1)# no shutdown

Enables the port.

Use the shutdown command to disable the port.

Configure an Interface Description

To configure an interface description, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface ethernet port-number

Example:

Device(config)# interface ethernet 1/1

Enters interface configuration mode

port-number : The port ID.

Step 4

[no] description string

Example:

Device(config-if-ethernet-1/1)# description cisco

Configures an interface description.

string : The port description. The format is string. Range is from 1 to 128.

Use the no description command to delete the interface description.

Configure Interface Speed

To configure interface speed, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface ethernet port-number

Example:

Device(config)# interface ethernet 1/1

Enters interface configuration mode.

Step 4

[no] speed {1000 | 10000 | auto}

Example:

Device(config-if-ethernet-1/1)# speed 1000

Configures the interface speed.

- 1000 : Port speed is 1000, in Mbps

- 10000 : Port speed is 10000, in Mbps

- auto : Port speed is automatic.

Use the no speed command to restore the default speed. The default is 10000.

Monitor Interfaces

Use the following commands to monitor interfaces.

Commands to Monitor Interfaces

Command

Purpose

show interface ethernet port-number

Display the interface's detailed configurations.

show interface brief ethernet port-number

Display the interface's brief configurations.

show description interface ethernet port-number

Displays the interface description.

show port-control mode

Displays the configured port-control mode.

Configuration Example: Basic Port Settings

The following example shows how to configure the description.

Device> enable
Device# configure terminal
Device(config)# interface ethernet 1/1
Device(config-if-ethernet-1/1)# description test
Device(config-if-ethernet-1/1)# exit

The following example shows how to modify the priority:

Device(config)# interface ethernet 1/1
Device(config-if-ethernet-1/1)# priority 7
Device(config-if-ethernet-1/1)# exit

The following example shows how to configure the interface-only accept tag frame:

Device(config)# interface ethernet 1/1
Device(config-if-ethernet-1/1)#  ingress acceptable-frame tagged
Device(config-if-ethernet-1/1)# exit

The following example shows how to disable ingress filtering:

Device(config)# interface ethernet 1/1
Device(config-if-ethernet-1/1)#  no ingress filtering
Device(config-if-ethernet-1/1)#  exit

The following example shows how to create VLAN 100, and only include interface 2 with interface 2 adopting trunk mode:

Device(config)#  vlan 100
Device(config-if-vlan)#  switchport ethernet 1/2
Device(config-if-vlan)#  interface ethernet 1/2
Device(config-if-ethernet-1/2)# switchport mode trunk
Device(config-if-ethernet-1/2)# exit

Chapter 2. Port Aggregation Configurations

- Overview of Port Aggregation

- How to Configure Port Aggregation

- Configuration Examples: Port Aggregation

Overview of Port Aggregation

The following sections provide information about port aggregation, aggregation group, load balance, system priority and port priority.

- Port Aggregation

- Load Balance

- System Priority

- Port Priority

Port Aggregation

Port aggregation allows you to group multiple physical ports into one unit. Port aggregation is useful for implementing load balancing and provides a redundant link backup.

To allow port aggregation, the basic configuration on all the ports must be consistent. The following list details the basic configuration parameters that should be consistent on all the ports:

- STP configurations, including STP enable or disable, STP priority, and STP cost.

- VLAN configurations, including permitted VLANs on a port and port VLAN ID (PVID).

- Port attribute configurations, including port speed, duplex mode, and link type.

Note

Only full duplex mode is supported.

Trunk, hybrid, or access link types are supported.

If the attributes of a port in an aggregation group on the same device is modified, then all the remaining ports in the group are automatically synchronized.

Aggregation Group

Port aggregation groups can be configured in the following modes:

- ON mode: Adds a port to a static aggregation group. Link Aggregation Control Protocol (LACP) is not required in this mode to negotiate with the device at the end. A static aggregation group can have up to eight ports.

- Active mode: Adds a port to a dynamic aggregation group. LACP is required in this mode to communicate with a device on the other side. In this mode, the port automatically initiates LACP negotiation.

- Passive mode: Adds a port to a dynamic aggregation group. LACP is required in this mode to communicate with a device on the other side. In this mode, a port responds only to LACP negotiation.

Note

A dynamic aggregation group can contain up to 12 ports. Out of the 12 ports, eight ports will be in the band l state and the remaining four will be in the backup state. Only ports with band l state will be allowed to forward normal traffic. If a port in the band l state faces a link down, a backup port with the highest port priority becomes the band l state.

The following is a list of the methods used to dock the devices configured in various modes:

- A device that is configured in static mode can dock with another device that is configured in static mode.

- A device that is configured in dynamic active mode can dock with another device that is configured either in dynamic active mode or dynamic passive mode.

- A device that is configured with dynamic passive mode can dock with another device that is configured in dynamic active mode.

Aggregation Group ID

You can either create an aggregation ID under global configuration mode or you can add a port to an aggregation group to automatically create an aggregation ID.

Load Balance

The default mode to configure load balancing is using the source MAC address.

You can view the configuration information with the show lacp internal [ch-id ] command.

System Priority

In dynamic mode, the primary and secondary devices are selected based on the system ID, which is generated based on the configured system priority and the local MAC address. The system priority of both the devices are compared, and the device with the highest priority (lower value) is selected as the primary device. The device with the lowest priority (higher value) is selected as the secondary device. If the priority of both the devices are the same, the local MAC address is compared. The device with the lower MAC address is selected as the primary device and the device with the higher MAC address is selected as the secondary device.

The default system priority is 32768.

Port Priority

In dynamic mode, the primary device uses the logical port to forward protocol packets, such as STP, to the secomdary device. The logical port is selected based on the port ID, which is a combination of port priority and port number. The port priority of both the ports are compared, and the port with the highest priority (lower value) is selected as the logical port. If the priority of both the ports are the same, the port number is compared. The port with the lower port number is selected as the logical port.

By default, all port priorities are the same, with a value of 128. You can configure the port priorities, as required. All port priority values are configured as integer multiples of 16. For example, if the port priority value is set as 17, the actual success is issued 17 / 16 = 1.

How to Configure Port Aggregation

The following sections provide configuration information on port aggregation.

- Configure Port Aggregation

- Configure a Load Balance Policy

- Configure System Priority

- Configure Port Priority

- Monitor Port Aggregation Configurations

Configure Port Aggregation

To configure port aggregation, perform these procedures.

- Configure an Aggregation Group ID

- Configure an Aggregation Group

Configure an Aggregation Group ID

To configure the aggregation group ID, perform this procedure.

Before you begin

- A port cannot be configured to multiple aggregation group IDs.

- An aggregation group cannot be deleted until all the ports are removed from the aggregation group.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

[no] channel-group channel_group_id

Example:

Device(config)# channel-group 2

Configures the aggregation group ID.

channel_group_id : Channel group ID. The range is from 0 to 5.

Use the no channel-group channel_group_id command to disable the aggregation group ID.

Configure an Aggregation Group

To configure an aggregation group, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface ethernet port-number

Example:

Device(config)# interface ethernet 1/1

Enters interface configuration mode.

port-number : The port ID.

Step 4

[no] channel-group channel_group_id mode {on | active | passive}

Example:

Device(config-if-ethernet-1/1)# channel-group 2 mode active

Adds a port to an aggregation group.

- channel_group_id : Channel group ID. The range is from 0 to 5.

- on : LACP static mode.

- active : LACP active mode.

- passive : LACP passive mode.

Use the no channel-group channel_group_id to remove the port from the aggregation group.

Configure a Load Balance Policy

To configure a load balance policy, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

[no]channel-group load-balance {src-mac | dst-mac | src-dst-mac | src-dst-ip | src-ip | dst-ip}

Example:

Device(config)# channel-group load-balance src-mac

Configures the load balance policy (all groups).

- src-mac : The source MAC address. The default load balance uses the source MAC address.

- dst-mac : The destination MAC address.

- src-dst-mac : The source and destination MAC address.

- src-dst-ip : The source and destination IP address.

- src-ip : The source IP address.

- dst-ip : The destination IP address.

Use the no channel-group load-balance command to restore the default load policy

Configure System Priority

To configure system priority, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

[no] lacp system-priority value

Example:

Device(config)# lacp system-priority

(Optional) Configures the priority of the system.

value : The priority value.

Use the no lacp system-priority command to restore the default configurations.

Configure Port Priority

To configure port priority, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface ethernet port-number

Example:

Device(config)# interface ethernet 1/1

Enters interface configuration mode.

port-number : The port ID.

Step 4

[no] lacp port-priority value

Example:

Device(config-if-ethernet-1/1)# lacp port-priority 8

Configures port priority.

Use the no lacp port-priority command to restore the default priority.

Monitor Port Aggregation Configurations

Use the following commands to monitor port aggregation configurations.

Commands to Monitor Port Aggregation Configuration Commands

Command

Purpose

show lacp internal [ch-id]

Displays the information of the aggregation group.

show lacp neighbor [ch-id]

Displays the neighbor information of the aggregation group.

show lacp sys-id

Displays the system priority configurations.

Configuration Examples: Port Aggregation

The following examples are that of a network topology where ports 1 to 12 of device 1 and device 2 are configured with dynamic LACP.

The following example shows how to configure device 1:

Device> enable
Device# configure terminal
Device(config)# channel-group 10
Device(config)# interface range ethernet 1/1 to ethernet 1/4
Device(config-if-range)# channel-group 10 mode active

The following example shows how to configure device 2:

Device> enable
Device# configure terminal
Device(config)# channel-group 10
Device(config)# interface range ethernet 1/1 to ethernet 1/4
Device(config-if-range)# channel-group 2 mode active

The following example shows how to view information after the dynamic LACP negotiation succeeds:

Device> enable
Device# configure terminal
Device(config)# show lacp internal
load balance: src-mac
Channel: 10, dynamic channel

Port   State   A-Key   O-Key   Priority   Logic-port   Actor-state
e1/1   bndl     11      11      128         1       10111100
e1/2   bndl     11      11      128         1       10111100
e1/3   bndl     11      11      128         1       10111100
e1/4   bndl     11      11      128         1       10111100

Chapter 3. Port Isolation Configuration

- Overview of Port Isolation

- How to Configure Port Isolation

- Configuration Example: Port Isolation

Overview of Port Isolation

You can configure certain ports on a device in isolation mode. Ports that are in isolation mode are allowed to communicate only to upstream ports, and not to downstream ports. This improves the security of the network and provides a flexible network solution.

How to Configure Port Isolation

To configure port isolation, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

[no] port-isolation ethernet port-number

Example:

Device(config)# port-isolation ethernet 1/1

Configures port isolation.

port-number : The port ID.

Use the no port-isolation {all | ethernet port-number} command to delete port isolation.

Step 4

show port-isolation

Example:

Device(config)# show port-isolation

Displays the isolation port.

Configuration Example: Port Isolation

The following examples are that of a network topology where PC1, PC2, and PC3 are connected to ports 2, 3, and 4 of a device. The device is connected to the external network through port 1. PC1, PC2, and PC3 should be isolated between Layer 2 and Layer 3.

The following example shows how to configure ports 2, 3, and 4 as downlink ports, and port 1 as uplink port:

Device> enable
Device# configure terminal
Device(config)# port-isolation ethernet 1/2 to e 1/4

The following example shows how to view the isolation port configuration:

Device> enable
Device# configure terminal
Device(config)# show port-isolation
Port isolation downlink port :
e1/2-e1/4.

Chapter 4. Digital Diagnostic Monitor

- Overview of Digital Diagnostic Monitor

- Monitor Digital Diagnostic Monitor

- Configuration Example: Digital Diagnostic Monitor

Overview of Digital Diagnostic Monitor

The Digital Diagnostic Monitor (DDM) allows you to perform diagnostic tests on transceiver modules such as small form-factor pluggable (SFP). Run the show interface sfp ethernet port-number command to view the various parameters of the transceiver module, such as temperature, voltage, transmission power, and so on.

Monitor Digital Diagnostic Monitor

Use the following command to monitor DDM test information.

Commands to Monitor DDM Test Information

Command

Purpose

show interface sfp ethernet port-number

Displays the DDM test information.

Configuration Example: Digital Diagnostic Monitor

The following example shows how to display DDM test information on a device:

Device> enable
Device# configure terminal
Device(config)# show interface sfp ethernet 1/1
Port e1/1 :
Common information:
Transceiver Type              :SFP
Compliance                    10G BASE-LR
Connector Type                :LC
WaveLength(nm)                :1310
Transfer Distance(m)          :10000(9um)
Digital Diagnostic Monitoring :YES
VendorName                    :WTD
Manufacture information:
Manu. Serial Number           :BP132500260047
Manufacturing Date            :2013-06-19
VendorName                    :WTD
Diagnostic information:
Temperature(℃)                :28
Voltage(V)                    :3.3098
Bias Current(mA)              :35.419
Bias High Threshold(mA)       :70.00
Bias Low  Threshold(mA)       :15.00
RX Power(dBm)                 :-2.80
RX Power High Threshold(dBm)  :0.00
RX Power Low  Threshold(dBm)  :-15.20
TX Power(dBm)                 :-3.10
TX Power High Threshold(dBm)  :0.00
TX Power Low  Threshold(dBm)  :-8.20

Chapter 5. Port Statistics

- Overview of Port Statistics

- Configure 5-Minute Port Rate Statistics

- Monitor Minute Port Rate Statistics

- Configuration Example: Port Statistics

Overview of Port Statistics

Configuring port statistics allows an administrator to detect network failures and analyze the cause. You can configure port statistics to capture the following information:

- The rate at which a port receives and transmits packet.

- The errors occurring while receiving and transmitting a packet.

- Classification by bytes.

- Packet loss occurring for unicast and multicast packets.

Configure 5-Minute Port Rate Statistics

Port rate stastics are used to calculate the average rate of receiving packet and transmitting packets during a specified time. The default statistical cycle and largest statistical period are five minutes.

To configure 5-minute port rate statistics, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

[no] port-rate-statistics interval value

Example:

Device(config)# port-rate-statistics interval

(Optional) Configures the interface statistics interval.

value : Time interval. The default is 5 minutes.

Use the [no] port-rate-statistics interval command to restore the default settings.

Monitor Minute Port Rate Statistics

Use the following command to monitor port rate statistics.

Command to Monitor Minute Port Rate Statistics

Command

Purpose

show statistics interface [ethernet port-number]

Displays port rate statistics information.

Monitor Ordinary Interface Packet Statistics

Use the following commands to monitor ordinary interface packet statistics.

Commands to Monitor Ordinary Interface Packet Statistics

Command

Purpose

show statistics dynamic interface

Displays interface real-time statistics information.

show utilization interface

Displays interface utilization.

show interface ethernet port-number

Displays interface information.

Monitor CPU Interface Statistics

Use the following commands to monitor CPU interface statistics.

Commands to Monitor CPU Interface Statistics

Command

Purpose

show cpu-statistic ethernet port-number

Displays CPU interface statistics information.

clear cpu-statistics

Clears CPU interface statistics.

show cpu-classification [interface ethernet port-number]

Displays CPU classification statistics information.

clear cpu-statistics

Clears CPU classification statistics information.

show utilization interface

Displays interface utilization.

show cpu-utilization

Displays CPU utilization.

Monitor Port Statistics of an Aggregation Group

Use the following commands to monitor the port statistics of an aggregation group.

Commands to Monitor Port Statistics of an Aggregation Group

Command

Purpose

show statistics channel-group [channel-id]

Displays LACP statistical information.

clear channel-group [channel-id]

Clears LACP statistical information.

Configuration Example: Port Statistics

The following example shows how to display interface statistics information:

Device> enable
Device# configure terminal
Device(config)# show statistics interface ethernet 1/1
Port number  :  e1/1
last 5 minutes input rate 6198600 bits/sec, 12106 packets/sec
last 5 minutes output rate 28256 bits/sec, 55 packets/sec
64 byte packets:4267810
65-127 byte packets:0
128-255 byte packets:0
256-511 byte packets:0
512-1023 byte packets:0
1024-1518 byte packets:0
4267707 packets input, 273132992 bytes , 1 discarded packets
4267707 unicasts, 0 multicasts, 0 broadcasts
1 input errors, 0 FCS error, 0 symbol error, 0 false carrier
1 runts, 0 giants
23763 packets output, 1520832 bytes, 0 discarded packets
0 unicasts, 23763 multicasts, 0 broadcasts
0 output errors, 0 deferred, 0 collisions
0 late collisions
Total entries: 1.

The following example shows how to display interface statistic information:

Device> enable
Device# configure terminal
Device(config)# show interface ethernet 1/1
Fast Ethernet e1/1 current state: enabled, port link is up
Time duration of linkup is 31 second
Hardware address is 00:0a:5a:00:04:1e
SetSpeed is auto, ActualSpeed is 100M, Duplex mode is full
Current port type: 100BASE-T
Priority is 0
Flow control is disabled
Broadcast storm control target rate is 50000pps
PVID is 1
Port mode: hybrid
Untagged  VLAN ID : 1
Input  : 5361414 packets, 343130240 bytes
0 broadcasts, 0 multicasts, 5361414 unicasts
Output : 23763 packets, 1520832 bytes
0 broadcasts, 23763 multicasts, 0 unicasts.

Chapter 6. Protection Switch Group

- Restrictions for Protection Switch Group

- Overview of Protection Switch Group

- Configure Protection Switch Group

- Configuration Example: Protection Switch Group

Restrictions for Protection Switch Group

- The rule template and unique template must be configured only after configuring the protection switch group.

- The protection switch group configuration fails if the hardware parameters, for example distance detected by ONT, on both primary and secondary ports are not consistent.

- The hardware parameters of both primary and secondary ports must not be configured after the protection switch group is configured.

Overview of Protection Switch Group

The Protection Switch Group feature ensures port reliability incase there is a port failure. Each protection switch group consists of two ports. One port takes the primary role and the other port the secondary role. The primary port is assigned the working state and the secondary port is assigned the standby state. Traffic always flows between ports that are assigned the working state.

After configuring the protection switch group, the rule template and unique template are configured on the primary port. The template configurations are automatically synchronized to the secondary port.

Configure Protection Switch Group

To configure protection switch group, perform this procedure.

Procedure

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

[no] psg group-id type-b primary interface gpon slot-number/port-number seconday interface gpon slot-number/port-number

Example:

Device(config)# psg 1 type-b primary interface gpon 0/3
secondary interface gpon 0/4

Configures the protection switch group.

- group-id : The protection switch group ID. The range is from 0 to 7.

- slot-number : The GPON slot number. The value is 0.

- port-number : The GPON port number. The range is from 1 to 8.

Use the [no] psg group-id command to remove a configured protection switch group.

Step 4

psg group-id force-switch

Example:

Device(config)# psg 1 force-switch

Forces port changeover.

group-id : The protection switch group ID. The range is from 0 to 7.

Step 5

show psg {group-id | all}

Example:

Device(config)# show psg 1 force-switch

Displays the protection switch group members, port roles and port states.

- group-id : The protection switch group ID. The range is from 0 to 7.

- all : All protection switch groups

Configuration Example: Protection Switch Group

The following example shows how to configure a protection switch group and perform a switch changeover

Device> enable
Device# configure terminal
Device(config)# psg 1 type-b primary interface gpon 0/3 secondary interface gpon 0/4
Config success.
Device(config)# psg 1 force-switch
Switch success.

The following example shows how to view the protection switch group configuration

Device> enable
Device# configure terminal
Device(config)# show psg 0
GroupID   Member  Role      State
0         0/1     PRIMARY   WORKING
0/2     SECONDARY STANDBY
Total: 1.

Full Cisco Trademarks with Software License

THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.

THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.

The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.

NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE.

IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

All printed copies and duplicate soft copies of this document are considered uncontrolled. See the current online version for the latest version.

Cisco has more than 200 offices worldwide. Addresses and phone numbers are listed on the Cisco website at www.cisco.com/go/offices.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: https://www.cisco.com/c/en/us/about/legal/trademarks.html. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1721R)