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Cisco Catalyst 3750-X Series Switches

Release Notes for the Catalyst 3750-X and 3560-X Switches, Cisco IOS Release 15.2(1)E and Later

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Table of Contents

Release Notes for Catalyst 3750-X and 3560-X Switches, Cisco IOS Release 15.2(1)E and Later

Contents

System Requirements

Supported Hardware

Device Manager System Requirements

Hardware

Software

Cluster Compatibility

CNA Compatibility

Upgrading the Switch Software

Finding the Software Version and Feature Set

Deciding Which Files to Use

Archiving Software Images

Upgrading a Switch by Using the Device Manager or Network Assistant

Upgrading a Switch by Using the CLI

Recovering from a Software Failure

Installation Notes

New Software Features

New in Cisco IOS Release 15.2(1)E

Minimum Cisco IOS Release for Major Features

Limitations and Restrictions

Cisco IOS Limitations

Access Control List

Address Resolution Protocol

Cisco Transceiver Modules and SFP Modules

Configuration

Diagnostics

EtherChannel

IEEE 802.1x Authentication

Multicasting

PoE or PoE+

QoS

RADIUS

Routing

Smart Install

SPAN and RSPAN

Spanning Tree Protocol

Stacking (Catalyst 3750-X Switch Stack only)

Stack Power (Catalyst 3750-X only)

VLANs

TrustSec

IP SLA Video Operation

Device Manager Limitations

Hardware Limitations

C3KX-SM-10G Network Module

Important Notes

Switch Stack Notes

Control Plane Protection

Cisco IOS Notes

Device Manager Notes

Open Caveats

Resolved Caveats

Caveats Resolved in Cisco IOS Release 15.2(1)E2

Caveats Resolved in Cisco IOS Release 15.2(1)E1

Caveats Resolved in Cisco IOS Release 15.2(1)E

Related Documentation

Obtaining Documentation and Submitting a Service Request

Release Notes for Catalyst 3750-X and 3560-X Switches, Cisco IOS Release 15.2(1)E and Later

March 12, 2014

Cisco IOS Release 15.2(1)E and later runs on Catalyst 3750-X and Catalyst 3650-X switches and on Cisco enhanced EtherSwitch service modules.

The Catalyst 3750-X switch supports stacking through Cisco StackWise Plus technology and also supports StackPower. The Catalyst 3560-X switches and the Cisco enhanced EtherSwitch service modules do not support switch stacking.

Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack.

For more information, see the Deciding Which Files to Use and the “Related Documentation” section.

These release notes include important information about Cisco IOS release 15.2(1)E and higher, and later and any limitations, restrictions, and caveats that apply to it. Verify that these release notes are correct for your switch:

You can download the switch software from this site (registered Cisco.com users with a login password):
http://www.cisco.com/cisco/web/download/index.html

System Requirements

Supported Hardware

 

Table 1 Catalyst 3750-X and Catalyst 3560-X Supported Hardware

Switch Model
Description
Supported by Minimum Cisco IOS Release

Catalyst 3560X-24T-E

24 10/100/1000 Ethernet ports, 1 network module slot, 350 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3560X-48T-E

48 10/100/1000 Ethernet ports, 1 network module slot, 350 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3560X-24P-E

24 10/100/1000 PoE+ 2 ports, 1 network module slot, 715 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3560X-48P-E

48 10/100/1000 PoE+ 2 ports, 1 network module slot, 715 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3560X-48PF-E

48 10/100/1000 PoE+2 ports, 1 network module slot, 1100 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3750X-24T-E

24 10/100/1000 Ethernet ports, StackWise Plus, StackPower, 1 network module slot, 350 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3750X-48T-E

48 10/100/1000 Ethernet ports, StackWise Plus, StackPower, 1 network module slot, 350 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3750X-24P-E

24 10/100/1000 PoE+2 ports, StackWise Plus, StackPower, 1 network module slot, 715 W power supply; IP Services feature se

12.2(53)SE2

Catalyst 3750X-48P-E

48 10/100/1000 PoE+ 2 ports, StackWise Plus, StackPower, 1 network module slot, 715 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3750X-48PF-E

48 10/100/1000 PoE+2 ports, StackWise Plus, StackPower, 1 network module slot, 1100 W power supply; IP Services feature set

12.2(53)SE2

Catalyst 3750-X-12S-S

12 SFP module slots, StackWise Plus, StackPower, 1 network module slot, 350-W power supply; IP Base feature set

12.2(55)SE5

Catalyst 3750-X-24S-S

24 SFP module slots, StackWise Plus, StackPower, 1 network module slot, 350-W power supply; IP Base feature set

12.2(55)SE5

Catalyst 3750-X-12S-E

12 SFP module slots, StackWise Plus, StackPower, 1 network module slot, 350-W power supply; IP Services feature set

12.2(55)SE5

Catalyst 3750-X-24S-E

24 SFP module slots, StackWise Plus, StackPower, 1 network module slot, 350-W power supply; IP Services feature set

12.2(55)SE5

Catalyst 3750-X-24T-L

24 10/100/1000 Ethernet ports, StackWise Plus, 1 network module slot, 350 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3750-X-48T-L

48 10/100/1000 Ethernet ports, StackWise Plus, 1 network module slot, 350 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3750-X-24P-L

24 10/100/1000 PoE+1 ports, StackWise Plus, 1 network module slot, 715 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3750-X-48P-L

48 10/100/1000 PoE+2 ports, StackWise Plus, 1 network module slot, 715 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3750-X-48PF-L

48 10/100/1000 PoE+2 ports, StackWise Plus, 1 network module slot, 1100 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3750-X-24T-S

24 10/100/1000 Ethernet ports, StackWise Plus, StackPower, 1 network module slot, 350 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3750-X-48T-S

48 10/100/1000 Ethernet ports, StackWise Plus, StackPower, 1 network module slot, 350 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3750-X-24P-S

24 10/100/1000 PoE+2 ports, StackWise Plus, StackPower, 1 network module slot, 715 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3750-X-48P-S

48 10/100/1000 PoE+2 ports, StackWise Plus, StackPower, 1 network module slot, 715 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3750-X-48PF-S

48 10/100/1000 PoE+2 ports, StackWise Plus, StackPower, 1 network module slot, 1100 W power supply; IP Base feature set1

12.2(53)SE2

Catalyst 3560-X-24T-L

24 10/100/1000 Ethernet ports, 1 network module slot, 350 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3560-X-48T-L

48 10/100/1000 Ethernet ports, 1 network module slot, 350 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3560-X-24P-L

24 10/100/1000 PoE+2 ports, 1 network module slot, 715 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3560-X-48P-L

48 10/100/1000 PoE+2 ports, 1 network module slot, 715 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3560-X-48PF-L

48 10/100/1000 PoE+2 ports, 1 network module slot, 1100 W power supply; LAN Base feature set

12.2(53)SE2

Catalyst 3560-X-24T-S

24 10/100/1000 Ethernet ports, 1 network module slot, 350 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3560-X-48T-S

48 10/100/1000 Ethernet ports, 1 network module slot, 350 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3560-X-24P-S

24 10/100/1000 PoE+2 ports, 1 network module slot, 715 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3560-X-48P-S

48 10/100/1000 PoE+2 ports, 1 network module slot, 715 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3560-X-48PF-S

48 10/100/1000 PoE+2 ports, 1 network module slot, 1100 W power supply; IP Base feature set

12.2(53)SE2

Catalyst 3750-X-24-U-L

24 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; LAN Base feature set

15.0(2)SE

Catalyst 3750-X-48-U-L

48 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; LAN Base feature set

15.0(2)SE

Catalyst 3750-X-24-U-S

24 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Base feature set

15.0(2)SE

Catalyst 3750-X-48-U-S

48 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Base feature set

15.0(2)SE

Catalyst 3750-X-24-U-E

24 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Services feature set

15.0(2)SE

Catalyst 3750-X-48-U-E

48 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Services feature set

15.0(2)SE

Catalyst 3560-X-24-U-L

24 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; LAN Base feature set

15.0(2)SE

Catalyst 3560-X-48-U-L

48 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; LAN Base feature set

15.0(2)SE

Catalyst 3560-X-24-U-S

24 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Base feature set

15.0(2)SE

Catalyst 3560-X-48-U-S

48 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Base feature set

15.0(2)SE

Catalyst 3560-X-24-U-E

24 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Services feature set

15.0(2)SE

Catalyst 3560-X-48-U-E

48 10/100/1000 Universal PoE ports, EEE support, 1 network module slot, 1100 W power supply; IP Services feature set

15.0(2)SE

SFP Modules

100FX-SFP
GE SFPLX/LH
GE SFP SX

1000BASE-LX/LH
1000BASE-SX
1000BASE-ZX
1000BASE-BX10-D
1000BASE-BX10-U
1000BASE-T
100BASE-FX
CWDM2
DWDM3

12.2(53)SE2










SFP+ Modules

SFP-10G-SR
SFP-10G-LR
SFP-10G-LRM
SFP-H10GB CU1M
SFP-H10GB CU3M
SFP-H10GB CU5M
DWDM

12.2(53)SE2

SFP+ Modules

SFP-10G-ER4

15.0(2)SE

Support for these SFP+ modules

Only version 02 (or later) of the CX15 cables are supported:

SFP-H10GB-CU1M
SFP-H10GB-CU3M
SFP-H10GB-CU5M

12.2(53)SE2

SFP module patch cable6

CAB-SFP-50CM

12.2(53)SE2

Power supply modules

C3KX-PWR-1100WAC
C3KX-PWR-715WAC
C3KX-PWR-350WAC
C3KX-PWR-440WDC
C3KX-PSBAY-BLNK

Note For power supply module descriptions and configurations supported on switch models, see the hardware installation guide.

12.2(53)SE2

C3KX-NM-10G
10-Gigabit Ethernet Network Module

Four SFP slots.
Two slots support only 1-Gigabit SFP modules, two slots support either 1-Gigabit SFP or 10-Gigabit SFP+ modules.

12.2(53)SE2

C3KX-NM-1G
1-Gigabit Ethernet Network Module

Four 1-Gigabit SFP module slots.

12.2(53)SE2

C3KX-NM-10GT
10-Gigabit Ethernet Network Module

Two 10-Gigabit Ethernet (copper) ports.

global configuration command.

15.0(1)SE

C3KX-SM-10G

2X1G/2X10G Fibre uplink service module

15.0(1)SE

eXpandable power system (XPS)

Cisco XPS 2200

12.2(55)SE1

1.PoE+ = Power over Ethernet, up to 30 W per port

2.CWDM = coarse wavelength-division multiplexer

3.DWDM = dense wavelength-division multiplexer

4.Only for Catalyst 3560-X and 3750-X switches

5.The CX1 cables are used with the OneX converters.

6.Only Catalyst 3560-X switches. The SFP module patch cable is a 0.5-meter, copper, passive cable with SFP module connectors at each end. The patch cable can be used in 1 Gigabit Ethernet SFP ports to connect two Catalyst 3560-X switches in a cascaded configuration. You can use the patch cable with the 10 G network module only on SFP ports 1 and 3 (not on SFP+ ports 2 and 4).

Device Manager System Requirements

Hardware

 

Table 2 Minimum Hardware Requirements

Processor Speed
DRAM
Number of Colors
Resolution
Font Size

233 MHz minimum7

512 MB8

256

1024 x 768

Small

7.We recommend 1 GHz.

8.We recommend 1 GB DRAM.

Software

• Windows 2000, XP, Vista, and Windows Server 2003.

• Internet Explorer 6.0, 7.0, Firefox 1.5, 2.0 or later with JavaScript enabled.

The device manager verifies the browser version when starting a session and does not require a plug-in.

Cluster Compatibility

You cannot create and manage switch clusters through the device manager. To create and manage switch clusters, use the command-line interface (CLI) or the Network Assistant application.

When creating a switch cluster or adding a switch to a cluster, follow these guidelines:

  • When you create a switch cluster, we recommend configuring the highest-end switch in your cluster as the command switch.
  • If you are managing the cluster through Network Assistant, the switch with the latest software should be the command switch.
  • The standby command switch must be the same type as the command switch. For example, if the command switch is a Catalyst 3750-X switch, all standby command switches must be Catalyst 3750-X switches.

For additional information about clustering, see Getting Started with Cisco Network Assistant , Release Notes for Cisco Network Assistant, the Cisco enhanced EtherSwitch service module documentation, the software configuration guide, and the command reference.

CNA Compatibility

Cisco IOS 15.2(1)EE will be supported in a future release of the Cisco Network Assistant. Cisco IOS 12.2(35)SE2 and later is only compatible with Cisco Network Assistant 5.0 and later. You can download Cisco Network Assistant from this URL:
http://www.cisco.com/pcgi-bin/tablebuild.pl/NetworkAssistant

For more information about Cisco Network Assistant, see the Release Notes for Cisco Network Assistant on Cisco.com.

Upgrading the Switch Software

Finding the Software Version and Feature Set

The Cisco IOS image is stored as a bin file in a directory that is named with the Cisco IOS release. A subdirectory contains the files needed for web management. The image is stored on the system board flash device (flash:).

You can use the show version privileged EXEC command to see the software version that is running on your switch. The second line of the display shows the version.


Note Although the show version output always shows the software image running on the switch, the model name shown at the end of this display is the factory configuration and does not change if you upgrade the software license.


You can also use the dir filesystem : privileged EXEC command to see the directory names of other software images that you might have stored in flash memory.

Deciding Which Files to Use

If you have a service support contract and order a software license or if you order a switch, you receive the universal software image and a specific software license. If you do not have a service support contract, such as a SMARTnet contract, download the IP base image from Cisco.com. For Catalyst 3750-X and 3560-X switches, this image has the IP base and LAN base feature sets.


Note A Catalyst 3750-X or 3560-X switch running the LAN base feature set supports only 255 VLANs.


The switches running the universal software images can use permanent and temporary software licenses. See the “Cisco IOS Software Activation Conceptual Overview” chapter in the Cisco IOS Software Activation Configuration Guide :
http://www.cisco.com/en/US/docs/ios/csa/configuration/guide/12.4T/csa_book.html

The universal software images support multiple feature sets. Use the software activation feature to deploy a software license and to enable a specific feature set.

Catalyst 3750-X and 3560-X switches running payload-encryption images can encrypt management and data traffic. Switches running nonpayload-encryption images can encrypt only management traffic, such as a Secure Shell (SSH) management session.

  • Management traffic is encrypted when SSH, Secure Socket Layer (SSL), Simple Network Management Protocol (SNMP), and other cryptographic-capable applications or protocols are enabled.
  • Data traffic is encrypted when MACsec is enabled.

For more information about Catalyst 3750-X and 3560-X software licenses and available images, see the Cisco IOS Software Installation Document on Cisco.com:
http://www.cisco.com/en/US/products/ps10745/products_installation_and_configuration_guides_list.html

 

Table 3 Software Images

Image
Filename
Description

Catalyst 3750-X and Catalyst 3560-X switches

IP base without payload encryption

c3750e-ipbasek9npe-tar.152-1.E.tar

c3560e-ipbasek9npe-tar.152-1.E.tar

Layer 2 and basic Layer 3 features, SSH9, SSL10, and SNMPv311, and Kerberos

IP base image, as well as LAN base image with Layer 2 features

IP base with payload encryption

c3750e-ipbasek9-tar.152-1.E.tar

c3560e-ipbasek9-tar.152-1.E.tar

Layer 2 and basic Layer 3 features, SSH, SSL, SNMPv3, Kerberos, and MACsec12

IP base image, as well as LAN base image with Layer 2 features

Universal without payload encryption

c3750e-universalk9npe-tar.152-1.E.tar

c3560e-universalk9npe-tar.152-1.E.tar

All the supported universal image features, Kerberos, SSH, SSL, and SNMPv3

LAN base, IP base, and IP services software licenses

Universal with payload encryption

c3750e-universalk9-tar.152-1.E.tar

c3560e-universalk9-tar.152-1.E.tar

All the supported universal image features, Kerberos, SSH, SSL, SNMPv3, and MACsec

LAN base, IP base, and IP services software licenses

Cisco enhanced EtherSwitch service modules

LAN base image

c2960sm-lanbasek9-tar.152-1.E.tar

Layer 2 features, SSH, SNMPv3, and Kerberos

For these service modules: SM-D-ES2-48, SM-ES2-16-P, SM-ES2-24, and SM-ES2-24-P6.

Universal image

c3560e-universalk9-tar.152-1.E.tar

All the supported universal image features, Kerberos, SSH, SSL, and SNMPv3

IP base and IP services software licenses

For these service modules: SM-D-ES3-48-P, SM-D-ES3G-48-P, SM-ES3-16-P, SM-ES3-24-P, SM-ES3G-16-P, and SM-ES3G-24-P.

9.SSH = Secure Shell

10.SSL = Secure Socket Layer

11.SNMPv3 = Simple Network Management Protocol Version 3

12.MACsec = MAC security standard

The upgrade procedures in these release notes describe how to perform the upgrade by using a combined tar file. This file contains the Cisco IOS image file and the files needed for the embedded device manager. You must use the combined tar file to upgrade the switch through the device manager. To upgrade the switch through the command-line interface (CLI), use the tar file and the archive download-sw privileged EXEC command.

Archiving Software Images

Before upgrading your switch software, make sure that you have archived copies of the current Cisco IOS release and the Cisco IOS release from which you are upgrading. You should keep these archived images until you have upgraded all devices in the network to the new Cisco IOS image and until you have verified that the new Cisco IOS image works properly in your network.

Cisco routinely removes old Cisco IOS versions from Cisco.com. See Product Bulletin 2863 for more information:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6969/ps1835/prod_bulletin0900aecd80281c0e.html

You can copy the bin software image file on the flash memory to the appropriate TFTP directory on a host by using the copy flash: tftp: privileged EXEC command.


Note Although you can copy any file on the flash memory to the TFTP server, it is time-consuming to copy all of the HTML files in the tar file. We recommend that you download the tar file from Cisco.com and archive it on an internal host in your network.


You can also configure the switch as a TFTP server to copy files from one switch to another without using an external TFTP server by using the tftp-server global configuration command. For more information about the tftp-server command, see the “Basic File Transfer Services Commands” section of the Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 :
http://www.cisco.com/en/US/docs/ios/fundamentals/command/reference/cf_t1.html

Upgrading a Switch by Using the Device Manager or Network Assistant

You can upgrade switch software by using the device manager or Network Assistant. For detailed instructions, click Help .


Note When using the device manager to upgrade your switch, do not use or close your browser session after the upgrade process begins. Wait until after the upgrade process completes.


Upgrading a Switch by Using the CLI

This procedure is for copying the combined tar file to the switch. You copy the file to the switch from a TFTP server and extract the files. You can download an image file and replace or keep the current image.

To download software, follow these steps:


Step 1 Use Table 3 to identify the file that you want to download.

Step 2 Download the software image file:

a. If you are a registered customer, go to this URL and log in:
http://www.cisco.com/cisco/web/download/index.html

b. Navigate to Switches > LAN Switches - Access

c. Navigate to your switch model.

d. Click IOS Software , and select the latest IOS release.

e. Download the image you identified in Step 1.

Step 3 Copy the image to the appropriate TFTP directory on the workstation, and make sure that the TFTP server is properly configured.

For more information, see Appendix B in the software configuration guide for this release.

Step 4 Log into the switch through the console port or a Telnet session.

Step 5 (Optional) Ensure that you have IP connectivity to the TFTP server by entering this privileged EXEC command:

Switch# ping tftp-server-address
 

For more information about assigning an IP address and default gateway to the switch, see the software configuration guide for this release.

Step 6 Download the image file from the TFTP server to the switch. If you are installing the same version of software that is currently on the switch, overwrite the current image by entering this privileged EXEC command:

Switch# archive download-sw /overwrite /reload tftp:[[//location]/directory]/image-name.tar
 

The /overwrite option overwrites the software image in flash memory with the downloaded one.

The /reload option reloads the system after downloading the image unless the configuration has been changed and not saved.

For // location , specify the IP address of the TFTP server.

For / directory / image-name .tar , specify the directory (optional) and the image to download. Directory and image names are case sensitive.

This example shows how to download an image from a TFTP server at 198.30.20.19 and to overwrite the image on the switch:

Switch# archive download-sw /overwrite tftp://198.30.20.19/c3750x-universal-tar.122-55.SE.tar
 

You can also download the image file from the TFTP server to the switch and keep the current image by replacing the /overwrite option with the /leave-old-sw option.


 

Recovering from a Software Failure

For recovery procedures, see the “Troubleshooting” chapter in the software configuration guide for this release.

Installation Notes

Use these methods to assign IP information to your switch:

  • The Express Setup program , as described in the switch getting started guide.
  • The CLI-based setup program, as described in the switch hardware installation guide.
  • The DHCP-based autoconfiguration, as described in the switch software configuration guide.
  • Manually assigning an IP address, as described in the switch software configuration guide.

New Software Features

New in Cisco IOS Release 15.2(1)E

  • (LAN Base) The First Hop Security feature in IPv6 supports the following:

Binding Table Recovery Mechanism - The binding table recovery mechanism enables the binding table to recover from a device reboot.

Prefix Guard - This feature works within the IPv6 Source Guard feature, enabling the device to deny traffic originated from nontopologically correct addresses.

Destination Guard - This feature works with IPv6 neighbor discovery to ensure that the device performs address resolution only for those addresses that are known to be active on the link.

Neighbor Discovery Multicast Suppress - This is an IPv6 snooping feature that runs on a switch or a wireless controller and is used to reduce the amount of control traffic necessary for proper link operations.

Lightweight DHCPv6 Relay Agent - This feature allows relay agent information to be inserted by an access node that performs a link-layer bridging (non-routing) function.

IPv6 Duplicate Address Detection (DAD) Proxy - This feature is a subset of Neighbor Discovery Multicast Supress. This takes care of detecting duplicate address in scenarios where end hosts cannot communicate with each other.

  • (LAN Base) Support for IPv6 QoS.
  • (LAN Base) Support for ciscoDynamicArpInspectionMIB.
  • (LAN Base) Support for Smart Install Upgrade Fallback and configuration-only deployment. (LAN Lite) Support for Smart Install image-only upgrade.
  • (LAN Base) Support for Hop by Hop EH ACL throttling and filtering.
  • (LAN Base) Support for GLC-T SFP+ ports.
  • (LAN Base) Support for GLC-GE-100FX on SFP+ ports (Not supported on Wall-E).
  • (LAN Base) Support for DWDM SFP+.
  • (LAN Base) Support for SFP+ ZR.
  • (LAN Base) Support for script based zero touch provisioning.
  • (LAN Base) The Digital Optical Monitoring (DOM) MIB for SFP optical transceivers allows you to monitor real-time operating parameters. Each DOM-capable optical transceiver has five sensors that are configured to monitor operational parameters such as temperature, voltage, laser bias current, and optical Tx and Rx power on a specific interface.
  • (IP Base) NSF support is now included in IP Base feature set.
  • (IP Services) Support for configuring VPN IPv6 routing session using static route or IPv6 routing protocols (OSPFv3, EIGRPv6, and BGPv6).
  • (IP Base) Support for Bidirectional Forwarding Detection, which is a detection protocol designed to provide fast forwarding path failure detection times for all media types, encapsulations, topologies, and routing protocols.
  • (IP Base) The SGA (SGT) deployability enhancements include the following features:

TrustSec Security Group Name Download

CISCO-TRUSTSEC-POLICY-MIB

SGA CoA

  • (IP Base) Support for Medianet Media Services Proxy.
  • (IP Base) Support for Medianet Metadata.
  • (IP Base) Manually configured tunnel over IPv4.
  • (IP Services) Support for ISISv6.
  • (IP Services) Support for BGPv6.
  • (IP Base) Support for IPv6 EIGRP stub routing.
  • (IP Base) Support for IPv6 PIM stub routing.
  • (LAN Base) Support for SXP loop detection.
  • (IP Base) Support for DHCP glean for device sensor.
  • (IP Base) Support for encrypting PMK password inside the switch.
  • (LAN Base) Support for CISCO-EMBEDDED-EVENT-MGR-MIB.
  • (LAN Base) Support for SNMP-COMMUNITY-MIB.
  • (IP Services) Support for VRF-aware SSH.
  • (IP Services) Support for VRF-aware TACACS+ server.
  • (IP Services) Support for VRF-aware DNS.
  • IPv6 compliant features:

(LAN Base) Updated ICMP RFCs 4291, 4443, 3484, 2526, 4861, 4862, 5095, 4007, and 3513.

(LAN Base) Support for UDP MIB (RFC 4113) and TCP MIB (RFC 4022).

  • (IP Services) EIGRP features:

EIGRP IPv6 NSF/GR

EIGRP MIB

EIGRP IPv6 MIBs

BFD

Route Tag Enhancements

Generate SNMP trap when EIGRP neighbor is down.

Disable IPX in EIGRP.

EIGRP add-path.

Support for EIGRP wide metrics.

  • (IP Services) OSPF features:

OSPFv3 BFD

OSPFv3 graceful shutdown

OSPFv2 NSSA

OSPFv3 NSSA Option

OSPFv3 External Path Preference

OSPFv3 Router Max-metric Router LSA

OSPFv3 Retransmission Limit

Support for OSPFv3 Prefix Suppression.

Support for OSPFv3 Area Filter/DC Ignore.

OSPFv3 MIB, OSPF MIB

  • (IP Services) BGP features:

BFD

  • (IP Base) Support for HSRP-aware PIM.
  • (LAN Base) IPv6 Neighbor Discovery enhancements:

Creating global IPv6 entries for unsolicited NA.

IPv6 ND cache expire.

Option to configure exponential backoff for NS timer used in NUD.

  • (LAN Base) IPv6 support for TFTP.
  • (LAN Base) Support for DNS over IPv6.
  • (IP Services) BGP Features:

Support for 4-byte BGP ASN numbers.

BGP support for malformed attribute error handling.

BGP support for Cisco-BGP-MIBv2.

BGP support for graceful shutdown.

BGP support for Add-Path.

BGP support for VRF dynamic route leaking (for VRF lite).

  • (LAN Base) Support for Netconf XML PI show output.
  • (LAN Base) Configurable TCP Keep Alive timer.
  • (Catalyst 3750-X Switch with C3KX-NM-10G) Support for Flexible Netflownon-key fields Username, Device Type, Applicaition Id and Power reading.
  • (IP Base) Service Discovery Gateway Support - Enables Zeronconf/mDNS protocols in the enterprise.
  • (IP Base) DHCPv6 Relay Chaining and Route Insertion.
  • (IP Base) IPv4 PIM support is now included into IPBase packaging.
  • (IP Base) IPv4 PBR support is now inlcuded into IPBase packaging.

Minimum Cisco IOS Release for Major Features

Table 4 lists the minimum software release after the first release of required to support the major features on the switches. The first release of the Catalyst 3750-X and 3560-X switches was Cisco IOS Release 12.2(53)SE2).

 

Table 4 Features Introduced After the First Release and the Minimum Cisco IOS Release Required

Feature
Minimum Cisco IOS Release Required
Catalyst Switch Support

Critical voice VLAN

15.0(1)SE

3750-X, 3560-X

NEAT enhancement to control access to the supplicant port

15.0(1)SE

3750-X, 3560-X

Cisco TrustSec SXP version 2, syslog messages, and SNMP support

15.0(1)SE

3750-X, 3560-X

Auto Smartports improved device classification

15.0(1)SE

3750-X, 3560-X

Device Sensor

15.0(1)SE

3750-X, 3560-X

Built-in Traffic Simulator using Cisco IOS IP SLAs video operations

12.2(58)SE1

3750-X, 3560-X

Cisco Mediatrace support

12.2(58)SE1

3750-X, 3560-X

Cisco performance monitor

12.2(58)SE1

3750-X, 3560-X

EnergyWise Phase 2.5

12.2(58)SE1

3750-X, 3560-X

Smart logging

12.2(58)SE1

3750-X, 3560-X

Protocol storm protection

12.2(58)SE1

3750-X, 3560-X

VACL Logging

12.2(58)SE1

3750-X, 3560-X

Smart Install 3.0

12.2(58)SE1

3750-X, 3560-X

Auto Smartports enhancements to enable auto-QoS on a digital media player.

12.2(58)SE1

3750-X, 3560-X

Memory consistency check routines

12.2(58)SE1

3750-X, 3560-X

Call Home support

12.2(58)SE1

3750-X, 3560-X

Support for 16 static routes on SVIs on the LAN Base feature set

12.2(58)SE1

3750-X, 3560-X

SDM template supporting more indirect routes

12.2(58)SE1

3750-X, 3560-X

NTP version 4

12.2(58)SE1

3750-X, 3560-X

DHCPv6 bulk-lease query and DHCPv6 relay source configuration

12.2(58)SE1

3750-X, 3560-X

Rolling stack upgrade

12.2(58)SE1

3750-X, 3750-C

NSF IETF mode for OSPFv2 and OSPFv3 (IP services feature set)

12.2(58)SE1

3750-X, 3560-X

RADIUS, TACACS+, and SSH/SCP over IPv6

12.2(58)SE1

3750-X, 3560-X

VRRP for IPv4

12.2(58)SE1

3750-X, 3560-X

IETF IP-MIB and IP-FORWARD-MIB(RFC4292 and RFC4293) updates

12.2(58)SE1

3750-X, 3560-X

Auto-QoS enhancements that add automatic configuration classification of traffic flow from video devices.

12.2(55)SE

3750-X, 3560-X

AutoSmartports enhancements—support for global macros, last-resort macros, event trigger control, access points, EtherChannels, auto-QoS with Cisco Medianet, and IP phones.

12.2(55)SE

3750-X, 3560-X

CDP and LLDP enhancements for exchanging location information with video end points.s.

12.2(55)SE

3750-X, 3560-X

Smart Install enhancements including client backup files, zero-touch replacement for clients with the same product-ID, and automatic generation of the image_list file.

12.2(55)SE

3750-X, 3560-X

Dynamic creation or attachment of an auth-default ACL on a port with no configured static ACLs.

12.2(55)SE

3750-X, 3560-X

VLAN assignment on a port configured for multi-auth mode.

12.2(55)SE

3750-X, 3560-X

EEM in IP base image.

12.2(55)SE

3750-X, 3560-X

IP base support for OSPF routed access.

12.2(55)SE

3750-X, 3560-X

Cisco TrustSec SXP.

12.2(55)SE
12.2(53)SE2

3750-X, 3560-X

Limitations and Restrictions

You should review this section before you begin working with the switch. These are known limitations that will not be fixed, and there is not always a workaround. Some features might not work as documented, and some features could be affected by recent changes to the switch hardware or software.

Access Control List

  • When a MAC access list is used to block packets from a specific source MAC address, that MAC address is entered in the switch MAC-address table.

The workaround is to block traffic from the specific MAC address by using the mac address-table static mac-addr vlan vlan-id drop global configuration command. (CSCse73823)

Address Resolution Protocol

  • The switch might place a port in an error-disabled state due to an Address Resolution Protocol (ARP) rate limit exception even when the ARP traffic on the port is not exceeding the configured limit. This could happen when the burst interval setting is 1 second, the default.

The workaround is to set the burst interval to more than 1 second. We recommend setting the burst interval to 3 seconds even if you are not experiencing this problem.(CSCse06827))

Cisco Transceiver Modules and SFP Modules

  • Cisco GLC-GE-100FX SFP modules with a serial number between OPC0926xxxx and OPC0945xxxx might show intermittent module not valid , data, status, link-flapping, and FCS errors.

The workaround is to use modules with serial numbers that are not in the specified range. (CSCsh59585)

• When switches are installed closely together and the uplink ports of adjacent switches are in use, you might have problems accessing the SFP module bale-clasp latch to remove the SFP module or the SFP cable (Ethernet or fiber).

Use one of these workarounds:

Allow space between the switches when installing them.

In a switch stack, plan the SFP module and cable installation so that uplinks in adjacent stack members are not all in use.

Use long, small screwdriver to access the latch then remove the SFP module and cable. (CSCsd57938)

  • The far-end fault optional facility is not supported on the GLC-GE-100FX SFP module.

The workaround is to configure aggressive UDLD. (CSCsh70244).

Configuration

  • When an excessive number (more than 100 packets per second) of Address Resolution Protocol (ARP) packets are sent to a Network Admission Control (NAC) Layer 2 IP-configured member port, a switch might display a message similar to this:

PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 0, class 51, max_msg 128, total throttled 984323

-Traceback= 6625EC 5DB4C0 5DAA98 55CA80 A2F2E0 A268D8

No workaround is necessary. Under normal conditions, the switch generates this notification when snooping the next ARP packet. (CSCse47548)

• When there is a VLAN with protected ports configured in fallback bridge group, packets might not be forwarded between the protected ports.

The workaround is to not configure VLANs with protected ports as part of a fallback bridge group. (CSCsg40322)

When a switch port configuration is set at 10 Mb/s half duplex, sometimes the port does not send in one direction until the port traffic is stopped and then restarted. You can detect the condition by using the show controller ethernet-controller or the show interfaces privileged EXEC commands.

The workaround is to stop the traffic in the direction in which it is not being forwarded, and then restart it after 2 seconds. You can also use the shutdown interface configuration command followed by the no shutdown command on the interface. (CSCsh04301)

  • When line rate traffic is passing through a dynamic port, and you enter the switchport access vlan dynamic interface configuration command for a range of ports, the VLANs might not be assigned correctly. One or more VLANs with a null ID appears in the MAC address table instead.

The workaround is to enter the switchport access vlan dynamic interface configuration command separately on each port. (CSCsi26392)

  • (Catalyst 3750-X or 3560-X switches) When the switch flash memory has less than 6 MB free space, there is not enough space in flash memory to hold temporary files created as part of a microcontroller unit (MCU) image upgrade, and the upgrade fails.

The workaround is to delete any unnecessary files in flash memory, delete the temporary files created as part of the failed upgrade, and try the MCU upgrade again. (CSCtd75400)

Diagnostics

  • (Catalyst 3750-X or 3560-X switches) When you enter the test cable-diagnostics tdr interface or the show cable-diagnostics tdr interface privileged EXEC command on an interface to determine the length of a connected cable, the cable length might be reported as N/A. This can occur when there is no link, a 10 Mb/s link, or a 100 Mb/s link, even though there are no cable faults. Cable length is reported correctly when a 1 Gb/s link is active on the interface.

The workaround to verify the cable length is to enter the commands when a Gigabit link is active on the interface or after disconnecting the far end of the cable. (CSCte43869)

EtherChannel

  • In an EtherChannel running Link Aggregation Control Protocol (LACP), the ports might be put in the suspended or error-disabled state after a stack partitions or a member switch reloads. This occurs when:

The EtherChannel is a cross-stack EtherChannel with a switch stack at one or both ends.

The switch stack partitions because a member reloads. The EtherChannel is divided between the two partitioned stacks, each with a stack master.

The EtherChannel ports are put in the suspended state because each partitioned stack sends LACP packets with different LACP Link Aggregation IDs (the system IDs are different). The ports that receive the packets detect the incompatibility and shut down some of the ports. Use one of these workarounds for ports in this error-disabled state:

Enable the switch to recover from the error-disabled state.

Enter the shutdown and the no shutdown interface configuration commands to enable the port.

The EtherChannel ports are put in the error-disabled state because the switches in the partitioned stacks send STP BPDUs. The switch or stack at the other end of the EtherChannel receiving the multiple BPDUs with different source MAC addresses detects an EtherChannel misconfiguration.

After the partitioned stacks merge, ports in the suspended state should automatically recover. (CSCse33842)

  • When a switch stack is configured with a cross-stack EtherChannel, it might transmit duplicate packets across the EtherChannel when a physical port in the EtherChannel has a link-up or link-down event. This can occur for a few milliseconds while the switch stack adjusts the EtherChannel for the new set of active physical ports and can happen when the cross-stack EtherChannel is configured with either mode ON or LACP. This problem might not occur with all link-up or link-down events.

No workaround is necessary. The problem corrects itself after the link-up or link-down event. (CSCse75508)

  • The switch might display tracebacks similar to this example when an EtherChannel interface port-channel type changes from Layer 2 to Layer 3 or the reverse:

15:50:11: %COMMON_FIB-4-FIBNULLHWIDB: Missing hwidb for fibhwidb Port-channel1 (ifindex 1632) -Traceback= A585C B881B8 B891CC 2F4F70 5550E8 564EAC 851338 84AF0C 4CEB50 859DF4 A7BF28 A98260 882658 879A58

There is no workaround. (CSCsh12472)

IEEE 802.1x Authentication

  • If a supplicant using a Marvel Yukon network interface card (NIC) is connected an IEEE 802.1x-authorized port in multihost mode, the extra MAC address of 0c00.0000.0000 appears in the MAC address table.

Use one of these workarounds (CSCsd90495):

Configure the port for single-host mode to prevent the extra MAC address from appearing in the MAC address table.

Replace the NIC card with a new card.

  • When MAC authentication bypass is configured to use Extensible Authentication Protocol (EAP) for authorization and critical authentication is configured to assign a critical port to an access VLAN:

If the connected device is supposed to be unauthorized, the connected device might be authorized on the VLAN that is assigned to the critical port instead of to a guest VLAN.

If the device is supposed to be authorized, it is authorized on the VLAN that is assigned to the critical port.

Use one of these workarounds (CSCse04534):

Configure MAC authentication bypass to not use EAP.

Define your network access profiles to not use MAC authentication bypass. For more information, see the Cisco Access Control Server (ACS) documentation.

  • When IEEE 802.1x authentication with VLAN assignment is enabled, a CPUHOG message might appear if the switch is authenticating supplicants in a switch stack.

The workaround is not use the VLAN assignment option. (CSCse22791)

Multicasting

• Multicast packets with a time-to-live (TTL) value of 0 or 1 are flooded in the incoming VLAN when all of these conditions are met:

Multicast routing is enabled in the VLAN.

The source IP address of the packet belongs to the directly connected network.

The TTL value is either 0 or 1.

The workaround is to not generate multicast packets with a TTL value of 0 or 1, or disable multicast routing in the VLAN. (CSCeh21660)

  • Multicast packets denied by the multicast boundary access list are flooded in the incoming VLAN when all of these conditions are met:

Multicast routing is enabled in the VLAN.

The source IP address of the multicast packet belongs to a directly connected network.

The packet is denied by the IP multicast boundary access-list configured on the VLAN.

There is no workaround. (CSCei08359)

• Reverse path forwarding (RPF) failed multicast traffic might cause a flood of Protocol Independent Multicast (PIM) messages in the VLAN when a packet source IP address is not reachable.

The workaround is to not send RPF-failed multicast traffic, or make sure that the source IP address of the RPF-failed packet is reachable. (CSCsd28944)

  • If the clear ip mroute privileged EXEC command is used when multicast packets are present, it might cause temporary flooding of incoming multicast traffic in the VLAN.

There is no workaround. (CSCsd45753)

  • When you configure the ip igmp max-groups number and ip igmp max-groups action replace interface configuration commands and the number of reports exceed the configured max-groups value, the number of groups might temporarily exceed the configured max-groups value. No workaround is necessary because the problem corrects itself when the rate or number of IGMP reports are reduced. (CSCse27757)
  • When you configure the IGMP snooping throttle limit by using the ip igmp max-groups number interface configuration on a port-channel interface, the groups learned on the port-channel might exceed the configured throttle limit number, when all of these conditions are true:

The port-channel is configured with member ports across different switches in the stack.

When one of the member switches reloads.

The member switch that is reloading has a high rate of IP IGMP joins arriving on the port-channel member port.

The workaround is to disable the IGMP snooping throttle limit by using the no ip igmp max-groups number interface configuration command and then to reconfigure the same limit again. (CSCse39909)

PoE or PoE+

  • When a loopback cable is connected to a switch PoE port, the show interface status privileged EXEC command shows not connected , and the link remains down. When the same loopback cable is connected to a non-PoE port, the link becomes active and then transitions to the error-disabled state when the keepalive feature is enabled.

There is no workaround. (CSCsd60647)

  • The Cisco 7905 IP Phone is error-disabled when the phone is connected to an external power source.

The workaround is to enable PoE and to configure the switch to recover from the PoE error-disabled state. (CSCsf32300)

• The pethPsePortShortCounter MIB object appears as short even though the powered device is powered on after it is connected to the PoE port.

There is no workaround. (CSCsg20629)

  • (Catalyst 3750-X or 3560-X switches) When a powered device (such as an IP phone) connected to a PoE+ port restarts and sends a CDP or LLDP packet with a power TLV, the switch locks to the power-negotiation protocol of that first packet. The switch does not respond to power requests from the other protocol. For example, if the switch is locked to CDP, it does not provide power to devices that send LLDP requests. If CDP is disabled after the switch has locked on it, the switch does not respond to LLDP power requests and can no longer power on any accessories.

The workaround is to turn the powered device off and then on again.

QoS

  • When QoS is enabled and the egress port receives pause frames at the line rate, the port cannot send packets.

There is no workaround. (CSCeh18677)

• Egress shaped round robin (SRR) sharing weights do not work properly with system jumbo MTU frames.

There is no workaround. (CSCsc63334)

  • In a hierarchical policy map, if the VLAN-level policy map is attached to a VLAN interface and the name of the interface-level policy map is the same as that for another VLAN-level policy map, the switch rejects the configuration, and the VLAN-level policy map is removed from the interface.

The workaround is to use a different name for the interface-level policy map. (CSCsd84001)

• If the ingress queue has low buffer settings and the switch sends multiple data streams of system jumbo MTU frames at the same time at the line rate, the frames are dropped at the ingress.

There is no workaround. (CSCsd72001)

  • When you use the srr-queue bandwidth limit interface configuration command to limit port bandwidth, packets that are less than 256 bytes can cause inaccurate port bandwidth readings. The accuracy is improved when the packet size is greater than 512 bytes.

There is no workaround. (CSCsg79627)

  • If QoS is enabled on a switch and the switch has a high volume of incoming packets with a maximum transmission unit (MTU) size greater than 1512 bytes, the switch might reload.

Use one of these workarounds:

Use the default buffer size.

Use the mls qos queue-set output qset-id buffers allocation1 ... allocation4 global configuration command to allocate the buffer size. The buffer space for each queue must be at least 10 percent. (CSCsx69718) (Catalyst 3750-X switches)

  • If you configure a large number of input interface VLANs in a class map, a traceback message similar to this might appear:
01:01:32: %BIT-4-OUTOFRANGE: bit 1321 is not in the expected range of 0 to 1024
 

There is no impact to switch functionality.

There is no workaround. (CSCtg32101)

RADIUS

• RADIUS change of authorization (COA) reauthorization is not supported on the critical auth VLAN.

There is no workaround. (CSCta05071)

Routing

• The switch stack might reload if the switch runs with this configuration for several hours, depleting the switch memory and causing the switch to fail:

The switch has 400 Open Shortest Path First (OSPF) neighbors.

The switch has thousands of OSPF routes.

The workaround is to reduce the number of OSPF neighbors to 200 or less. (CSCse65252)

  • When the PBR is enabled and QoS is enabled with DSCP settings, the CPU utilization might be high if traffic is sent to unknown destinations.

The workaround is to not send traffic to unknown destinations. (CSCse97660)

Smart Install

  • When upgrading switches in a stack, the director cannot send the correct image and configuration to the stack if all switches in the stack do not start at the same time. A switch in the stack could then receive an incorrect image or configuration.

The workaround is to use an on-demand upgrade to upgrade switches in a stack by entering the vstack download config and vstack download image commands. (CSCta64962)

  • When you upgrade a Smart Install director to Cisco IOS Release 12.2(55)SE but do not upgrade the director configuration, the director cannot upgrade client switches.

When you upgrade the director to Cisco IOS Release 12.2(55)SE, the workaround is to also modify the configuration to include all built-in, custom, and default groups. You should also configure the tar image name instead of the image-list file name in the stored images. (CSCte07949)

  • Backing up a Smart Install configuration could fail if the backup repository is a Windows server and the backup file already exists in the server.

The workaround is to use the TFTP utility of another server instead of a Windows server or to manually delete the existing backup file before backing up again. (CSCte53737)

  • If the director in the Smart Install network is located between an access point and the DHCP server, the access point tries to use the Smart Install feature to upgrade even though access points are not supported devices. The upgrade fails because the director does not have an image and configuration file for the access point.

There is no workaround. (CSCtg98656)

• When a Smart Install director is upgrading a client switch that is not Smart Install-capable (that is, not running Cisco IOS Release 12.2(52)SE or later), the director must enter the password configured on the client switch. If the client switch does not have a configured password, there are unexpected results depending on the software release running on the client:

When you select the NONE option in the director CLI, the upgrade should be allowed and is successful on client switches running Cisco IOS Release 12.2(25)SE through 12.2(46)SE, but fails on clients running Cisco IOS Release 12.2(50)SE through 12.2(50)SEx.

When you enter any password in the director CLI, the upgrade should not be allowed, but it is successful on client switches running Cisco IOS Release 12.2(25)SE through 12.2(46)SE, but fails on clients running Cisco IOS Release 12.2(50)SE through 12.2(50)SEx.

There is no workaround. (CSCth35152)

SPAN and RSPAN

• When the RSPAN feature is configured on a switch, CDP packets received from the RSPAN source ports are tagged with the RSPAN VLAN ID and forwarded to trunk ports carrying the RSPAN VLAN. When this happens, a switch that is more than one hop away incorrectly lists the switch that is connected to the RSPAN source port as a CDP neighbor.

This is a hardware limitation. The workaround is to disable CDP on all interfaces carrying the RSPAN VLAN on the device connected to the switch. (CSCeb32326)

• When egress SPAN is running on a 10-Gigabit Ethernet port, only about 12 percent of the egress traffic is monitored.

There is no workaround. This is a hardware limitation. (CSCei10129)

  • (Catalyst 3650-X and 3750-X switches) When you enter the show monitor privileged EXEC command the monitor source port output is incorrect. This situation occurs only if the monitor source port(s) is a pluggable Gigabit module and you set any source port combination, except when just using a single Gigabit port on the pluggable module as the source port.

This is a cosmetic issue and the workaround is to use the show platform monitor session privileged EXEC command to display the correct source ports. (CSCtn67868)

Spanning Tree Protocol

  • CSCtl60247

When a switch or switch stack running Multiple Spanning Tree (MST) is connected to a switch running Rapid Spanning Tree Protocol (RSTP), the MST switch acts as the root bridge and runs per-VLAN spanning tree (PVST) simulation mode on boundary ports connected to the RST switch. If the allowed VLAN on all trunk ports connecting these switches is changed to a VLAN other than VLAN 1 and the root port of the RSTP switch is shut down and then enabled, the boundary ports connected to the root port move immediately to the forward state without going through the PVST+ slow transition.

There is no workaround.

Stacking (Catalyst 3750-X Switch Stack only)

  • When a switch stack is running 802.1x single host mode authentication and has filter-ID or per-user policy maps applied to an interface, these policies are removed if a master switchover occurs. Even though the output from the show ip access-list privileged EXEC command includes these ACLs, the policies are not applied.

The workaround it to enter a shutdown and then a no shutdown interface configuration command on the interface. (CSCsx70643)

  • When using the logging console global configuration command, low-level messages appear on both the stack master and the stack member consoles.

The workaround is to use the logging monitor global configuration command to set the severity level to block the low-level messages on the stack member consoles. (CSCsd79037)

  • If a new member switch joins a switch stack within 30 seconds of a command to copy the switch configuration to the running configuration of the stack master, the new member might not get the latest running configuration and might not operate properly.

The workaround is to reboot the new member switch. Use the remote command all show run privileged EXEC command to compare the running configurations of the stack members. (CSCsf31301)

  • When the flash memory of a stack member is almost full, it might take longer to start up than other member switches. This might cause that switch to miss the stack-master election window. As a result, the switch might fail to become the stack master even though it has the highest priority.

The workaround is to delete files in the flash memory to create more free space. (CSCsg30073)

  • A stack member switch might fail to bundle Layer 2 protocol tunnel ports into a port channel when you have followed these steps:

1. You configure a Layer 2 protocol tunnel port on the master switch.

2. You configure a Layer 2 protocol tunnel port on the member switch.

3. You add the port channel to the Layer 2 protocol tunnel port on the master switch.

4. You add the port channel to the Layer 2 protocol tunnel port on the member switch.

After this sequence of steps, the member port might stay suspended.

The workaround is to configure the port on the member switch as a Layer 2 protocol tunnel and at the same time also as a port channel. For example:

Switch(config)# interface fastethernet1/0/11
Switch(config-if)# l2protocol-tunnel cdp
Switch(config-if)# channel-group 1 mode on (CSCsk96058)
 
  • After a stack bootup, the spanning tree state of a port that has IEEE 802.1x enabled might be blocked, even when the port is in the authenticated state. This can occur on a voice port where the Port Fast feature is enabled.

The workaround is to enter a shutdown interface configuration command followed by a no shutdown command on the port in the blocked state. (CSCsl64124)

  • When the switch stack is in the HSRP active state and a master changeover occurs, you cannot ping the stack by using an HSRP virtual IP address.

There is no workaround. (CSCth00938)

Stack Power (Catalyst 3750-X only)

  • When a power stack has been configured in redundant mode, which is not the default, and then split by either removing cables or disabling StackPower ports, the newly created power stack has the same mode as the former power stack, but this is not shown in the configuration file.

The workaround when you are forming power stack topologies if the power stack mode is not the default (power sharing), you should also configure the power stack mode on the new power stacks by entering the mode redundant power-stack configuration command. (CSCte33875)

VLANs

  • If the number of VLANs times the number of trunk ports exceeds the recommended limit of 13,000, the switch can fail.

The workaround is to reduce the number of VLANs or trunks. (CSCeb31087)

  • When the domain is authorized in the guest VLAN on a member switch port without link loss and an Extensible Authentication Protocol over LAN (EAPOL) is sent to an IEEE 802.1x supplicant to authenticate, the authentication fails. This problem happens intermittently with certain stacking configurations and only occurs on the member switches.

The workaround is to enter the shut and no shut interface configuration commands on the port to reset the authentication status. (CSCsf98557)

• The error message %DOT1X_SWITCH-5-ERR_VLAN_NOT_FOUND might appear for a switch stack under these conditions:

IEEE 802.1 is enabled.

A supplicant is authenticated on at least one port.

A new member joins a switch stack.

You can use one of these workarounds:

Enter the shutdown and the no shutdown interface configuration commands to reset the port.

Remove and reconfigure the VLAN. (CSCsi26444)

• When you enter the boot host retry timeout global configuration command to specify the amount of time that the client should keep trying to download the configuration and you do not enter a timeout value, the default value is zero, which should mean that the client keeps trying indefinitely. However, the client does not keep trying to download the configuration.

The workaround is to always enter a non zero value for the timeout value when you enter the boot host retry timeout timeout-value command. (CSCsk65142)

  • When many VLANs are configured on the switch, high CPU utilization occurs when many links are flapping at the same time.

The workaround is to remove unnecessary VLANs to reduce CPU utilization when many links are flapping. (CSCtl04815)

TrustSec

The following guidelines and limitations apply to configuring Cisco TrustSec SGT and SGACL on the Catalyst 3750-X switch:

  • You cannot statically map an IP-subnet to an SGT. You can only map IP addresses to an SGT. When you configure IP address-to-SGT mappings, the IP address prefix must be 32.
  • If a port is configured in Multi-Auth mode, all hosts connecting on that port must be assigned the same SGT. When a host tries to authenticate, its assigned SGT must be the same as the SGT assigned to a previously authernticated host. If a host tries to authenticate and its SGT is different from the SGT of a previously authenticated host, the VLAN port (VP) to which these hosts belong is error-disabled.
  • Cisco TrustSec enforcement is supported only on up to eight VLANs on a VLAN-trunk link. If there are more than eight VLANs configured on a VLAN-trunk link and Cisco TrustSec enforcement is enabled on those VLANs, the switch ports on those VLAN-trunk links will be error-disabled.
  • The switch cannot assign an SGT based on SXP listening; it can only forward the SXP bindings through the SXP protocol.
  • Port-to-SGT mapping should be configured only on Cisco TrustSec links (that is, switch-to-switch links).

When port-to-SGT mapping is configured on a port, an SGT is assigned to all ingress traffic on that port. There is no SGACL enforcement for egress traffic on the port.

  • SGT/SGACL is supported on Cisco Catalyst 3750-X and 3650-X series switches with all network uplink modules: C3KX-NM-1G, C3KX-NM-10G, C3KX-NM-10GT and C3KX-SM-10G. The C3KX-SM-10G is only required for MACsec on the uplinks.
  • TrustSec Layer-3 Identity Port Mapping (L3IPM) is not supported on Catalyst 3750-X and 3650-X series switches.

IP SLA Video Operation

  • After removing an IP SLA Video Operation VRF configuration, the VRF configuration still shows up in show running-config and show ip sla configuration . The VRF configuration is removed, but the CLI is not updated.

The workaround is to completely remove the IP SLA Video Operation and configure again without VRF. (CSCuf39077)

Device Manager Limitations

• When you are prompted to accept the security certificate and you click No , you only see a blank screen, and the device manager does not launch.

The workaround is to click Yes when you are prompted to accept the certificate. (CSCef45718)

Hardware Limitations

C3KX-SM-10G Network Module

  • NetFlow Data Export (NDE) fails when the IP address specified by the destination keyword belongs to a network that is connected to the Ethernet management port (FastEthernet0) on the switch.

There is no workaround. (CSCtt05810)

  • Cisco Trust Security (CTS) MACsec cannot be configured on the C3KX-SM-10G service module until the POST test has been completed. Wait approximately 45 seconds after the module is inserted before you configure CTS MACsec on the port. (CSCuc20819)

Important Notes

Switch Stack Notes

  • Always power off a switch before adding or removing it from a switch stack.

Control Plane Protection

Catalyst 3750-X and 3560-X switches internally support up to 16 different control plane queues. Each queue is dedicated to handling specific protocol packets and is assigned a priority level. For example, STP, routed, and logged packets are sent to three different control plane queues, which are prioritized in corresponding order, with STP having the highest priority. Each queue is allocated a certain amount of processing time based on its priority. The processing-time ratio between low-level functions and high-level functions is allocated as 1-to-2. Therefore, the control plane logic dynamically adjusts the CPU utilization to handle high-level management functions as well as punted traffic (up to the maximum CPU processing capacity). Basic control plane functions, such as the CLI, are not overwhelmed by functions such logging or forwarding of packets.

Cisco IOS Notes

• Unlike other platforms, the response to an Energywise query on a Catalyst 3750-X or 3560-X is the actual switch power consumption and not a fixed number.

• If the switch requests information from the Cisco Secure Access Control Server (ACS) and the message exchange times out because the server does not respond, a message similar to this appears:

00:02:57: %RADIUS-4-RADIUS_DEAD: RADIUS server 172.20.246.206:1645,1646 is not responding.
 

If this message appears, make sure that there is network connectivity between the switch and the ACS. You should also make sure that the switch has been properly configured as an AAA client on the ACS.

• If the switch has interfaces with automatic QoS for voice over IP (VoIP) configured and you upgrade the switch software, when you enter the auto qos voip cisco-phone interface configuration command on another interface, you might see this message:

AutoQoS Error: ciscophone input service policy was not properly applied
policy map AutoQoS-Police-CiscoPhone not configured
 

If this happens, enter the no auto qos voip cisco-phone interface command on all interface with this configuration to delete it. Then enter the auto qos voip cisco-phone command on each of these interfaces to reapply the configuration.

Device Manager Notes

• You cannot create and manage switch clusters through the device manager. To create and manage switch clusters, use the CLI or Cisco Network Assistant.

  • When the switch is running a localized version of the device manager, the switch displays settings and status only in English letters. Input entries on the switch can only be in English letters.
  • For device manager session on Internet Explorer, popup messages in Japanese or in simplified Chinese can appear as garbled text. These messages appear properly if your operating system is in Japanese or Chinese.
  • We recommend this browser setting to speed up the time needed to display the device manager from Microsoft Internet Explorer.

From Microsoft Internet Explorer:

1. Choose Tools > Internet Options .

2. Click Settings in the “Temporary Internet files” area.

3. From the Settings window, choose Automatically .

4. Click OK .

5. Click OK to exit the Internet Options window.

  • The HTTP server interface must be enabled to display the device manager. By default, the HTTP server is enabled on the switch. Use the show running-config privileged EXEC command to see if the HTTP server is enabled or disabled.

If you are not using the default method of authentication (the enable password), you need to configure the HTTP server interface with the method of authentication used on the switch

Beginning in privileged EXEC mode, follow these steps to configure the HTTP server interface:

 

Command
Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

ip http authentication { aaa | enable | local}

Configure the HTTP server interface for the type of authentication that you want to use.

  • aaa —Enable the authentication, authorization, and accounting feature. You must enter the aaa new-model interface configuration command for the aaa keyword to appear.
  • enable—Enable password, which is the default method of HTTP server user authentication, is used.
  • local—Local user database, as defined on the Cisco router or access server, is used.

Step 3

end

Return to privileged EXEC mode.

Step 4

show running-config

Verify your entries.

The device manager uses the HTTP protocol (the default is port 80) and the default method of authentication (the enable password) to communicate with the switch through any of its Ethernet ports and to allow switch management from a standard web browser.

If you change the HTTP port, you must include the new port number when you enter the IP address in the browser Location or Address field (for example, http://10.1.126.45:184 where 184 is the new HTTP port number). You should write down the port number through which you are connected. Use care when changing the switch IP information.

  • If you use Internet Explorer Version 5.5 and select a URL with a nonstandard port at the end of the address (for example, www . cisco.com:84 ), you must enter http:// as the URL prefix. Otherwise, you cannot launch the device manager.

Open Caveats

Unless otherwise noted, these caveats apply to Catalyst 3750-X and 3560-X switches:

• CSCte99366

In a Smart Install network, when the director is connected between the client and the DHCP server and the server has options configured for image and configuration, then the client does not receive the image and configuration files sent by the DHCP server during an automatic upgrade. Instead the files are overwritten by the director and the client receives the image and configuration that the director sends.

Use one of these workarounds:

If client needs to upgrade using an image and configuration file configured in the DHCP server options, you should remove the client from the Smart Install network during the upgrade.

In a network using Smart Install, you should not configure options for image and configuration in the DHCP server. For clients to upgrade using Smart Install, you should configure product-id specific image and configuration files in the director.

• CSCtf79259

If you install 10/100/1000BASE-TX or 100BASE-FX SFPs in the SFP+ module ports (port 2 or port 4), the ports are put in an error disabled state. These SFPs are not supported in the SFP+ ports.

There is no workaround.

• CSCtg35226 (Catalyst 3750-X switch)

Cisco Network Assistant displays the LED ports with a light blue color for all switches in a stack that have the Catalyst 3750G-48PS switch as part of the stack.

There is no workaround.

• CSCtj97806

Mediatrace does not report statistics on the initiator under these conditions:

The responder is a mixed switch stack with a Catalyst 3750 as the master switch

The ingress interface on the responder from the initiator is on a member switch.

The workaround is to ensure that the mediatrace ingress and egress connections are on the stack master or to configure a Catalyst 3750-X as the stack master and then reload the switch stack.

  • CSCtl32991

When running EIGRP on the switch, unicast EIGRP packets are not sent to the higher priority routing protocol queue when destined for the switch, but are sent to the host queue. This situation occurs when EIGRP is running on the switch and packets are sent to the switch. This situation does not impact EIGRP packets sent between routers through the switch.

There is no workaround.

  • CSCtn46265

When you enter the copy running-config startup config privileged EXEC command on the switch, the running configuration is not always saved to the startup configuration on the first attempt.

There is no workaround. If you wait for a few minutes, the configuration is saved when the switch attempts it again.

• CSCtq22963

NetFlow traffic export fails when the source interface IP address and destination IP address are on different subnets.

There is no workaround.

  • CSCtq35006

On a switch stack, when an IP phone connected to a member switch has its MAC address authorized using the critical voice VLAN feature, if a master changeover occurs, the voice traffic is dropped. Drop entries for the IP phone appear in the MAC address table management (MATM) table. This occurs because the switch initially drops the voice traffic before reauthenticating critical voice VLAN traffic. The dropped entries are removed when critical voice VLAN authentication occurs.

There is no workaround. The dropped entries are removed when the IP phone is reauthenticated.

• CSCtq38500

When you configure port-based QoS with an ACL by using the ACL range option, problems can occur if you have also configured mls qos trus t on the interface.

The workaround is to match traffic by using the single port equal ( eq ) option or to not configure mls qos trust on the interface.

• CSCtq76989

A seed switch is connected to a RADIUS server either directly or through a trunk port. A non-seed switch authenticates with the RADIUS server through the seed switch, based on the credential information defined in the RADIUS server. Cisco TrustSec (CTS) parameters must be configured on both the seed switch and the non-seed switch trunk interfaces.

Although the non-seed switch is authenticated and authorized to connect to the network, supplicant devices connected to the non-seed switch might be unable to connect to the network, under these circumstances:

CTS caching is enabled on the seed switch and not enabled on the non-seed switch.

The seed switch reported the 802.1x role of the non-seed switch CTS trunk as authenticator in multi-host mode.

The non-seed switch reported this CTS trunk as the 802.1x authenticator role in single host mode and as supplicant.

The workaround is to reduce the reauthentication time on the seed switch, or enter the shutdown interface configuration command, followed by the no shutdown interface configuration command on the seed switch CTS trunk interface.

  • CSCtr82236

When a switch stack member configured for RMON statistics collection is not booted up with the master switch, the RMON collection configuration is missing from the stack running-config. To prevent this situation from occurring, all stack switches configured for the RMON statistics collection must be booted up with the other stack members and master switch at the same time.

There is no workaround.

  • CSCtr87645

ASP now uses a device classifier, which determines the type of device that is connected to the switch. As a result, ASP has no control over the protocol type that is used to detect the device. Therefore, the protocol detection controls are deprecated. When you enter the macro auto global control detection command, the protocol does not show up in the running configuration; however, the filter-spec command is shown in the output.

There is no workaround. To see the deprecated commands, enter the show running config deprecated global and interface configuration command.

  • CSCts75641

RIP hellos get triplicated as they exit a dot1q-tunnel interface. This situation occurs specifically when a dot1q-tunnel configuration is applied.

There is no workaround.

• CSCtt22566 (Catalyst 3560-X and 3750-X)

Monitored SPAN traffic is not sent to the SPAN destination when TrustSec MACsec is enabled on the SPAN source interface.

There is no workaround.

  • CSCty02174 (Catalyst 3750-X)

A stack power member switch that does not have a PSU connected in Slot A or Slot B might fail during a Cisco IOS upgrade.

The workaround is to ensure that each stack member has at least one PSU connected. Alternatively, you can download and install the Cisco IOS image using the archive download-sw /force-ucode-reload privileged EXEC command.

  • CSCua12396 (Catalyst

After a master switchover on a switch stack, IPV6 multicast routing fails.

The workaround is to avoid configuring IPv6 multicast routing on larger stacks. We recommend enabling IPv6 multicast routing on stacks with five or fewer members.

  • CSCua22035

The following message may be erroneously displayed during the boot up process.

Message “stack locked up.. even after FSM reset”
 

There is no workaround.

  • CSCua58659

The global power inline consumption default 15400 command fails to restrict the power consumption of a PoE+ port 15.4 W.

The workaround is to use the power inline consumption 15400 command in interface configuration mode.

  • CSCua67288

When QoS is disabled on a port, the occurrence of IP fragments might cause packets to be dropped on Queue 1.

The workaround is to enable QoS and tweak the buffer thresholds.

  • CSCub20474

In a switch stack, multicast traffic can be lost for up to 60 seconds when the master switch is reloaded. Because the platform does not suppaort multicast non-stop-forwarding (NSF), the time before traffic reconvergence after a switchover can vary.

There is no workaround.

  • CSCuc20819

Errors occur when configuring Cisco Trust Security (CTS) MACsec on the C3KX-SM-10G network service module.

The workaround is to use the default command in CTS manual interface configuration mode to clear the interface, and then reapply the configuration.

  • CSCug74567 (Catalyst 3750-X switch)

On reloading the stack master, the supplicants with Filter-ID lose connectivity.

The workaround is to use dACL instead of Filter-ID. For supplicants with Filter-ID, there would be loss of connectivity until a new session is established.

  • CSCuh84031

Unable to send or receive any data traffic from the uplink service module C3KX-SM-10G, when GE-100FX SFP is used on the module.

There is no workaround.

  • CSCuh91047

This problem occurs when creating a 3750X stack with Cisco TrustSec (CTS) link that connects to the Catalyst 4000 series switch.

Configure the Catalyst 4000 series switch as a non-seed switch. Connect few phones or PCs, authenticate them with Dot1x/MAB/Webauth, and then allow all the sessions to remain active. After a couple of days of longevity, if you perform master switchover for 5-6 times, huge memory leak occurs.

The workaround is to either ignore the memory leak or reboot the switch to clear the memory leak. The memory leak that occurs is false and hence there is no memory consumption.

  • CSCug54690

IPv6 access-list counters do not increment when a policymap associated with a classmap that matches an IPv6 ACL is applied to a physical interface and matching traffic is sent.

There is no workaround.

  • CSCug69823

System crashes if you remove EnergyWise SNMP proxy configuration immediately after configuring it.

The workaround is to wait for some time after configuring EnergyWise SNMP proxy, and then remove the configuration to avoid a crash.

  • CSCug74567

If the stack master is reloaded, supplicant switches with Filter-ID Access Control Lists (ACLs) lose their connectivity.

The workaround is to use Downloadable ACLs (DACLs) instead of Filter-ID ACLs.

  • CSCui88612

When a Catalyst 3750-X or 3560-X UPoE switch is connected to another 3750-X or 3560-X UPoE switch and one of them is reloaded, the speed is negotiated to 100Mbps. The workaround is to restart the interface (using the shutdown and no shutdown interface configuration command) after the switch is reloaded. Alternatively, configure the speed manually to 1000Mbps after the switch is reloaded.

  • CSCuj35704

A Dynamic ACL with a remark statement is not pushed from ISE to client and authorization either fails or is unauthorized.

The workaround is to remove the remark statement from the DACL.

Resolved Caveats

Caveats Resolved in Cisco IOS Release 15.2(1)E2

  • CSCul90866 (Catalyst 3750-X and Catalyst 3560-X)

The switch resets during normal network operation due to a malformed Multicast Domain Name service (mDNS) packet.

There is no workaround.

Caveats Resolved in Cisco IOS Release 15.2(1)E1

  • CSCts80209

If login quiet-mode is configured, the switch resets when you enter the no login block-for command.

There is no workaround.

  • CSCuc53853

Provided an HTTP server is enabled on a switch, a vulnerability exists in Cisco IOS switches where the remote, non-authenticated attacker can cause Denial of Service (DoS) by reloading an affected device. An attacker can exploit this vulnerability by sending a special combination of crafted packets.

There is no workaround.

  • CSCui65252

When Dynamic ARP Inspection (DAI) is enabled over port channel, it stops processing the Address Resolution Protocol (ARP) packets.

The workaround is to set up a direct link between the access switch and the DHCP server.

  • CSCuj00841

Cisco TrustSec (CTS) feature is not supported on the switch.

There is no workaround.

  • CSCuj29803

Security Group Access Control List (SGACL) with log option set on the switch does not print syslogs.

There is no workaround.

  • CSCuj46750

Cisco TrustSec Security Group Tag Exchange Protocol (CTS-SXP) is missing on the switch.

There is no workaround.

  • CSCuj56845

When you enable either the device-sensor accounting or the access-session accounting attributes command, the accounting request is not sent from the switch to the radius (ISE) Server.

The workaround is to not enable device-sensor accounting. The user accounting message will not carry the device-sensor attributes to the ISE.

  • CSCuj87317

VRRPv3 is not available on the switch in Cisco IOS Release 15.2(1)E.

VRRPv3 is made available from Cisco IOS Release 15.2(1)E1.

  • CSCui98897

The match input-interface interface-id-list class-map configuration command does not recognize multiple interfaces to be matched.

There is no workaround.

Caveats Resolved in Cisco IOS Release 15.2(1)E

  • CSCuc51915

A Preboot Execution Environment (PXE) enabled host is unable to boot properly when IP Source Guard is configured on the switch.

There is no workaround.

  • CSCud67457

An interoperability issue occurs between MSTP and RSTP. An access port on the MSTP boundary switch and trunk port on RSTP boundary is not a supported design. Aloop is created when the interoperability occurs between the access port on the MST boundary switch and trunk port on the RSTP boundary.

There is no workaround.

  • CSCud89149 (Catalyst 3750-X switch)

IP Telephony Design (IPDT) on the master switch does not update new VLAN ID after 802.1x authentication.

The workaround is to disable open access to the port by entering the no authentication open command and then allow traffic only after a successful 802.1x authentication. Add a short lease DHCP server on the default access VLAN for the clients to obtain a different IP address on default access VLAN and dynamic VLAN.

  • CSCue03906

If you connect the C3KX-SM-10G uplink module to switches by using the Flex Links configuration, the MAC and FLCD flapping notifications are generated between the active and backup interface.

There is no workaround.

  • CSCue07405 (Catalyst 3750-X switch)

When manually running on-demand diagnostic tests on a stack member using the diagnostic start switch number test all interface configuration command, the TestPortAsicRingLoopback test fails arbitrarily.

The workaround is to run only the TestPortAsicRingLoopback test ( diagnostic start switch number test 4 interface configuration command) on the stack member. Isolate the stack member and then run the diagnostic start switch number test all interface configuration command on the rest of the stack.

  • CSCue942529 (Catalyst 3750-X switch)

When the show mac address-table interface gigabitethernet privileged EXEC command is entered, all interfaces are replicated with the same command.

There is no workaround.

  • CSCuf13634

The interface status shows that the port is up, and duplex and speed are set to auto, even though link negotiation is disabled (when using the speed nonegotiate interface configuration command).

The workaround is to restart the interface using the shutdown and no shutdown interface configuration command.

  • CSCuf21387 (Catalyst 3750-X switch)

When the SNMP is polled, the entPhysicalContainedIn object displays the value 0 for FRULink Container. The SNMP cannot be queried from the CLI with a no repetition value as 0.

There is no workaround.

  • CSCuf77683

Internal VLANs are displayed when the show snmp mib ifmib ifindex command is entered or the SNMP is queried for the ipMIB object.

The workaround is to check if the displayed VLANs are internal and then to hide them.

  • CSCug17582

When AAA is configured, the following message is displayed when entering the enable command:

Password required, but none set

The workaround is to enter the aaa authentication enable default enable global configuration command.

  • CSCug43533

If macros are used for device classification, the CISCO_LAST_RESORT_EVENT macro is triggered on the switch inexplicably.

There is no workaround.

  • CSCug51225 (Catalyst 3750-X switch)

If a new member is added to the switch stack, a Topology Change Notification (TCN) flood is triggered on the network.

There is no workaround.

  • CSCug67745 (Catalyst 3750-X switch)

In multicast mode, Web Cache Communication Protocol (WCCP) ISY packets are not received by the cache engine.

The workaround is to use unicast mode.“Open Caveats” section

  • CSCuh12528

With DHCP address conflict resolution enabled (by using the ip dhcp conflict resolution global configuration command), the switch stops operating when the clear ip dhcp conflict command is entered.

There is no workaround.

Related Documentation

User documentation in HTML format includes the latest documentation updates and might be more current than the complete book PDF available on Cisco.com.

with complete information about the switch are available from these Cisco.com sites:

Catalyst 3750-X
http://www.cisco.com/en/US/products/ps10745/tsd_products_support_series_home.html

Catalyst 3560-X
http://www.cisco.com/en/US/products/ps10744/tsd_products_support_series_home.html

These documents provide complete information about the switches:

  • Release Notes for the Catalyst 3750-X. Catalyst 3750-E, Catalyst 3560-X, and 3560-E Switches
  • Catalyst 3750-X and 3560-X Switch Software Configuration Guide
  • Catalyst 3750-X and 3560-X Switch Command Reference
  • Catalyst 3750-X, 3750-E, 3560-X, and 3560-E Switch System Message Guide
  • Cisco IOS Software Installation Document.
  • Catalyst 3750-X and 3560-X Switch Getting Started Guide
  • Catalyst 3750-X and 3560-X Switch Hardware Installation Guide
  • Regulatory Compliance and Safety Information for the Catalyst 3750-X and 3560-X Switch
  • Installation Notes for the Catalyst 3750-X and 3560-X Switch Power Supply Modules
  • Installation Notes for the Catalyst 3750-X and 3560-X Switch Fan Module
  • Installation Notes for the Catalyst 3750-X and 3560-X Switch Network Modules
  • Installation Notes for the Cisco TwinGig Converter Module
  • Cisco Redundant Power System 2300 Hardware Installation Guide
  • Cisco Redundant Power System 2300 Compatibility Matrix
  • Cisco eXpandable Power System 2200 Hardware Installation Guide
  • Configuring the Cisco eXpandable Power System (XPS) 2200
  • Auto Smartports Configuration Guide
  • Cisco EnergyWise Configuration Guide
  • Smart Install Configuration Guide
  • Information about Cisco SFP, SFP+, and GBIC modules is available from this Cisco.com site:
    http://www.cisco.com/en/US/products/hw/modules/ps5455/prod_installation_guides_list.html

SFP compatibility matrix documents are available from this Cisco.com site:
http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html

For other information about related products, see these documents:

  • Getting Started with Cisco Network Assistant
  • Release Notes for Cisco Network Assistant
  • Network Admission Control Software Configuration Guide

These documents have information about the Cisco enhanced EtherSwitch service modules:

Connecting Cisco Enhanced EtherSwitch Service Modules to the Network :
http://www.cisco.com/en/US/docs/routers/access/interfaces/nm/hardware/installation/guide/eesm_hw.html

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation , which also lists all new and revised Cisco technical documentation:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

Subscribe to the What’s New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service and Cisco currently supports RSS version 2.0.